ECS Meeting Abstracts最新文献

{"title":"Solar-Driven Upgrading of Biomass by Coupled Hydrogenation Using in Situ Photoelectrochemically Generated H₂","authors":"Keisuke Obata, Xinyi Zhang, Tabea Thiel, Michael Schwarze, Reinhard Schomäcker, Roel van de Krol, Fatwa Firdaus Abdi","doi":"10.1149/ma2023-01372128mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-01372128mtgabs","url":null,"abstract":"Green H 2 has been recognized as an important element in efforts to decarbonize our fossil fuel-dependent society. One approach to produce green H 2 is solar water splitting in a photoelectrochemical (PEC) device. Solar-to-hydrogen (STH) efficiencies of up to 30% have been demonstrated 1 but studies have shown that this approach still results in a relatively high levelized cost of hydrogen (LCOH) of ~10 US$ per kg of H 2 . 2-3 This is ca. one order of magnitude higher than that of hydrogen produced via steam methane reforming (SMR), which forms the bulk of the currently produced H 2 . A possible solution is to incorporate an upgrading process of biomass feedstock that generates valuable chemicals into the solar water splitting device. This is expected to not only decrease the overall LCOH but also introduce an alternative renewable pathway in chemical manufacturing. In this study, we propose the concept of solar-driven hydrogenation of biomass-derived feedstock. Photoelectrochemically generated H 2 in our solar water splitting device is coupled in situ with the homogenously catalyzed hydrogenation of itaconic acid (IA) to methyl succinic acid (MSA). IA has been identified by the US Department of Energy as one of the twelve building blocks that possess the potential to be transformed subsequently into several high-value bio-based chemicals or materials. 4 MSA is a valuable chemical compound with an estimated global market size of up to ~15,000 tonnes, whose derivatives are ubiquitously used as solvents in cosmetics, 5 polymer synthesis, 6 binders in powder coatings, 7 and organic synthesis, especially for pharmaceutical synthesis. 8-9 Our coupled hydrogenation approach—performed in the PV-electrolyzer and PEC configurations using III-V PV cells and BiVO 4 -based photoelectrode, respectively—successfully demonstrate solar-driven H 2 -to-MSA conversion efficiencies as high as 60%. In comparison to the non-coupled approach (i.e., direct hydrogenation), our coupled system offers synergistic benefits in terms of prolonged durability and a higher degree of flexibility toward other important chemical transformation reactions. In addition, life-cycle net energy assessment and technoeconomic analysis results show that adding the coupled hydrogenation process significantly lowers the energy payback time and the LCOH, respectively, to a point that is competitive even with SMR-produced H 2 . Further implications and optimization potentials of the coupled PEC hydrogenation approach will be discussed. References Kim, J. H.; Hansora, D.; Sharma, P.; Jang, J.-W.; Lee, J. S., Toward practical solar hydrogen production – an artificial photosynthetic leaf-to-farm challenge. Chem. Soc. Rev. 2019, 48 (7), 1908-1971. Shaner, M. R.; Atwater, H. A.; Lewis, N. S.; McFarland, E. W., A comparative technoeconomic analysis of renewable hydrogen production using solar energy. Energy Environ. Sci. 2016, 9 (7), 2354-2371. Pinaud, B. A.; Benck, J. D.; Seitz, L. C.; Forman, A. J.;","PeriodicalId":11461,"journal":{"name":"ECS Meeting Abstracts","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135089415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"(Invited) Poly(lactic acid)-Nanodiamond Composites for Electroanalytical Applications","authors":"Mateusz Cieślik, Krzysztof Formela, Mariusz Banasiak, Pawel Niedzialkowski, Robert Bogdanowicz, Jacek Ryl","doi":"10.1149/ma2023-01221586mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-01221586mtgabs","url":null,"abstract":"There has been an exponential increase in the popularity of 3D printing technology in the last few years, also in everyday life. Numerous applications are reported for poly(lactic acid) (PLA) based polymer composites with various conductive carbon fillers for electrochemical needs, such as sensors, batteries, water remediation, etc. The bulk of these reports is based on commercially available 3D printing filaments, with carbon black, graphene or carbon nanotubes as fillers. Regardless of good conductivity, these materials possess characteristics that are suboptimal for electrochemical applications, including charge transfer kinetics, stability to oxidation, electrolytic window, etc. 3D printouts offer versatility in terms of ease of cheap and on-demand fabrication of free-standing multielectrode setups e.g. by dual-extruder printing. However, to fully embrace their advantages enhancement of charge transfer kinetics by removing an excess of PLA and uncovering the nanofillers, is needed. Recently we have demonstrated laser ablation for locally sculptured effective modification of the electrochemical response of these materials. There is a great focus on the development of new conductive filaments that exhibit better mechanical, electric, thermal, and electrochemical properties. We have evaluated for the first time various forms of conductive nanodiamonds (ND), i.e. detonation nanodiamonds and diamond-phase rich boron-doped carbon nanowalls, as fillers for PLA-based composites for 3D printing. The goal of the research was to investigate and thoroughly understand the interactions between composite components and those that affect the mechanical parameters and electrochemical characteristics of printed elements, studying how ND addition to PLA matrix affects material strength, rheology, and melting temperature. In particular, the enhancement of electrode kinetics and electrochemically available surface area by ND was revealed and discussed. The authors acknowledge the financial support by The National Science Centre (Republic of Poland) SONATA BIS 2020/38/E/ST8/00409.","PeriodicalId":11461,"journal":{"name":"ECS Meeting Abstracts","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135089427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling Mesoporous 3D-Printed Lattice Electrodes for Energy Storage","authors":"Julia Elizabeth Huddy, Anand P Tiwari, William Joseph Scheideler","doi":"10.1149/ma2023-01241597mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-01241597mtgabs","url":null,"abstract":"3D printing could offer the versatility to design and manufacture energy storage devices on demand. The precision and material flexibility of 3D printing is ideal for integrating porous electrodes that can enhance electrochemical performance [1] . This work analyzes the electrical conductivity of 3D-printed mesoscale strut lattices at the 100 μm – 1 mm scale with 40 – 90 % volumetric porosity to develop optimal electrodes for energy storage devices. We use a graph-theory-based model [2] to compute the conductivity of multiple 3D lattice types with either solid conducting struts or struts coated with conductive material. These structures show 3 – 5X higher conductivity than random conductive foams that lack an internal periodic mesostructure [3] . Using microstereolithography, we 3D print samples with high-resolution struts (< 70 µm) that maintain their shape and achieve high conductivity after carbonization at 700 ˚C. By tuning the lattice architecture, we manipulate the tradeoff between conductivity, weight, and porosity, validating our simulations with experimental measurements. These results demonstrate that that body-centered cubic (BCC) strut lattices have optimal conductivity per weight compared with other lattice types. Implementing these 3D-printed conductive lattices as supercapacitor electrodes, we see that the lattice architecture impacts the gravimetric capacitance of the devices as well as the mechanical strength, with octet structures outperforming both cubic and BCC lattices. Electrochemical impedance spectroscopy (EIS) shows that 3D-printed electrodes with higher porosity exhibit higher gravimetric double layer capacitance and lower charge transfer resistance, making them ideal candidates for use in supercapacitor electrodes as free-standing 3D hosts for active materials. CV characterization of the electrodes also illustrates how our graph theory-based model for 3D lattices can predict the optimal structure for energy storage. This model can also serve to predict electrode performance and tailor design for integration of higher surface area nanoporous materials on these conductive 3D printed scaffolds. This allows us to guide the design of 3D printed electrodes to minimize charge transfer resistance and achieve an optimal balance between gravimetric and volumetric energy density for device applications. [1] J. Zhao, Y. Zhang, X. Zhao, R. Wang, J. Xie, C. Yang, J. Wang, Q. Zhang, L. Li, C. Lu, Y. Yao, Advanced Functional Materials 2019 , 29 , 1900809. [2] J. E. Huddy, M. S. Rahman, A. B. Hamlin, Y. Ye, W. J. Scheideler, Cell Reports Physical Science 2022 , 3 , 100786. [3] F. G. Cuevas, J. M. Montes, J. Cintas, P. Urban, J Porous Mater 2008 , 16 , 675. Figure showing (a) designed octet (blue), cubic (orange), and BCC (red) lattice types as well as (b) SEM images of their experimental 3D-printed counterparts and (c) measured electrical resistance. Figure 1","PeriodicalId":11461,"journal":{"name":"ECS Meeting Abstracts","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135089429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"(Invited) A Closer Look at Impact Ionization Coefficients in Wide Band Gap Semiconductors: Theoretical Models and Measured Data","authors":"Enrico Bellotti, Masahiko Matsubara","doi":"10.1149/ma2023-01321819mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-01321819mtgabs","url":null,"abstract":"The direct measurement of ionization coefficients in wide band gap semiconductor materials is challenging due to the need to operate at high field strengths and the requirement of specific test structures that enable single carrier injection. More often than not, ionization coefficients are inferred from current multiplication data measured in p-n junctions or transistors structures. Unfortunately, sub-par material quality, processing issues and inappropriate measuring techniques have led to ionization coefficients values that are contradictory and with large variation among different datasets. As a result, theoretical models that attempt to predict the values of the carriers’ ionization coefficients are important since they provide an estimate of the expected values and a first order evaluation of the material performance. Developing theoretical models presents its own set of challenges. The established approach is based on a full electronics structure description of the semiconductor material and a suitable model to quantify the interaction of carriers with phonons, impurities and material imperfections. While this methodology has been successful with conventional elemental and compound semiconductors, and it has been applied to some wide band gap materials such as GaN, 4H-SiC [1,2] and diamond, a number of open issues still exists. The main difficulty is the determination of the carrier-phonon scattering strength at high electric field strengths that cannot be inferred from low-field mobility measurements. Among all wide band gap semiconductors, 4H-SiC [3] and GaN [4] are the material for which ionization coefficients have been measured by several groups. In the case of GaN, different measured ionization coefficients datasets are available and seems to provide a consistent indication of the expected values. Corresponding theoretical models based on full-band Monte Carlo simulations have been able to predict the correct trends, namely the fact that holes dominate the ionization process, but a quantitative agreement between predicted and measured values has only been achieved recently [5]. This talk will provide an overview of the currently available experimentally measured ionization coefficients for wide band gap semiconductors and compare them to the ones obtained with theoretical models of different complexity. Specifically the development of the theoretical models for high-field transport for 4H-SiC, GaN will be discussed. Three different approaches, one based on empirical carrier-phonon scattering rates, one using the rigid pseudo ion model, and the direct evaluation of the interaction parameters based on a ab-initio DFT approach will be compared, and the outcome for each one of them benchmarked against the measured values. Additionally, the models will be applied to determine the ionization coefficients in AlGaN alloys, cubic BN and diamond. [1] E. Bellotti et al., J. Appl. Phys., 87, (8), p.3864, 15 April 2000. [2] F. Bertazzi et al., J.","PeriodicalId":11461,"journal":{"name":"ECS Meeting Abstracts","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135089434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of Wearable Microneedle-Based Platform for Real-Time Biomarkers Sensing","authors":"Kai Fan, Kuei-Lin Liu, Jun-Hsuan Chung, Zong-Hong Lin","doi":"10.1149/ma2023-01341936mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-01341936mtgabs","url":null,"abstract":"The wearable device technology plays a huge role in the healthcare sector owing to the aging global population and increased acquisition of the internet of things (IoT). Further, the Coronavirus Disease-2019 (COVID-19) pandemic has accelerated the emergence of wearable medical devices in the market. The patients with chronic diseases are more focused on tracking single or multiple nutrients and biomarkers in the body. Diabetes is a classic example of chronic disease where the patients need to monitor their blood glucose level for a long time. In addition, diabetic patients also face electrolyte imbalance which gives rise to several other diseases. There is an immense urgency to develop a sensing platform that can detect the essential ions as well as biomarkers from the interstitial fluid (ISF) as it contains valuable information about the physiological status of a person. According to Centers for Disease Control and Prevention (CDC), imbalance of sodium concentration in the body may lead to stroke, hypertension, and epilepsy; for potassium: arrhythmia, chronic kidney disease (CKD), and dizziness; for calcium: depression, osteoporosis, and other bone-related disease; for pH of body fluid: urinary tract infection, respiratory acidosis, and sleep apnea. Within this advent of wearables, microneedle (MN)-based transdermal sensors are well positioned to play a key role in combining the significant benefits of dermal interstitial fluid (ISF) as a source of clinical indicators and minimally invasive skin puncturing to allow the collection of real-time diagnostic data. In this context, we have developed a MNs based versatile platform for the transdermal amperometric detection of glucose and different clinically relevant biomarkers such as K + , Na + , Ca 2+ in the body fluid in a robust, reliable, and cost-effective way. Here, stainless steel microneedle (SS-MN) is used as an ideal candidate for multiplex sensing due to its great chemical stability as well as the rigidity for accurate and painless puncture. The device is fabricated with ion selective electrode (ISM) coating on each needle for their corresponding electrolyte and enzyme for glucose detection. In vitro experiments performed in artificial ISF samples yielded excellent sensitivity and a good linear response. The sensor is successfully applied for in vivo detection of glucose and these ions in SD rats for validating their feasibility as a real-time sensing device. Overall, this developed concept comprises of significant progress in the sensing of glucose and other ions in relation to an electrolyte imbalance in the humans that holds relevance in controlling several diseases.","PeriodicalId":11461,"journal":{"name":"ECS Meeting Abstracts","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135089436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Flexible and Stretchable Temperature Sensor Based on Contact Electrification for Robotic Sensing","authors":"Kee Chin Lim, Shuo-Wen Chen, Yung-Hsin Chen, Yan-Tsz Huang, Arnab Pal, Zong-Hong Lin","doi":"10.1149/ma2023-01341877mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-01341877mtgabs","url":null,"abstract":"With the rapid development of robotic systems, an increasing number of various sensitive sensors are needed to meet the requirement of data collection for unmanned detection and monitoring technology. Among various external stimuli information, temperature sensing is an essential important function that can avoid high-temperature scalding injuries, achieve robot detection of environmental, and human-machine interfaces applications. However, most of the existing temperature sensors for robotic sensing are realized by rigid materials, which have the disadvantage of not being able to adapt to an arbitrarily curved surface. Also, most of the sensors are thermistor-based approaches, which faces challenges in developing a low-cost robotic system since external power is required to obtain the sensing signal. In this work, a self-powered and stretchable temperature sensor based on Triboelectric Nanogenerator (TENG) technology was developed. The principle of TENG is the coupling effect of triboelectric charge transfer and electrostatic induction effects, which can generate different magnitudes of electrical signals when subjected to external stimuli, including temperature. To this end, this study is a pilot effort toward validating the sensitivity of TENG electrical output on different temperature effects. The surface potential of materials is explored under different temperatures by Kelvin probe force microscopy (KPFM), which shows the feasibility of self-powered temperature sensor. The proposed temperature sensor is composed of highly resilient materials physiological saline as liquid electrode encapsulated with Ecoflex as triboelectric layer, which has the advantage of biocompatibility. The temperature sensing performance was successfully maintained at 200% stretch. Owing to its flexible, bendable and stretchable characteristics, the self-powered temperature-sensitive sensor has been successfully demonstrated on a robot hand, which can read the information and respond to different temperatures through the feedback system. Overall, this self-powered temperature-sensitive sensor has great potential to be an emerging tool for human-robot interaction and automatic detection.","PeriodicalId":11461,"journal":{"name":"ECS Meeting Abstracts","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135089446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"(Invited) towards Continuous Health Monitoring Platforms By Enzyme-Free Electrochemical Sensors and Triboelectric Sensors for Noninvasive Lactate Detection","authors":"Min-Hsin Yeh","doi":"10.1149/ma2023-01341875mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-01341875mtgabs","url":null,"abstract":"Emerging wearable devices with non-invasively biosensing technics have drawn considerable attention to continuously monitor several metabolites in body fluids, such as a tear, saliva, and sweat, to diagnose human health conditions. Most importantly, wearable sensors could offer unique possibilities for online, real-time and non-invasive monitoring of health compared to traditional invasive biosensors. Among lots of analytes, lactic acid concentration in the human body exhibits a high relationship with several diseases such as acute heart diseases, hypoxia, muscle fatigue, meningitis, and cystic fibrosis, and it could also cause muscle pain in athletes. To further boost up the reproducibility and reliability of wearable biosensors to detect lactate concentration levels from human sweat, Ni-based layered double hydroxide (LDH) with various secondary transition metals (Fe and Co) was proposed as electrocatalysts in an enzyme-free electrochemical lactate sensor. According to the mechanism of lactate oxidation on the transition metal-based electrocatalyst, secondary transition metal of Co could serve as the active site for lactate oxidation and facilitate the adsorption of OH - in the alkaline electrolyte. To further increasing the active surface area for enhancing the sensitivity of Ni-based LDH, ZIF-67 derived NiCo LDH was synthesized as the electrocatalyst for non-enzymatic lactate detection. Co-based ZIF-67 served as self-sacrificial templates to fabricate hierarchically structural NiCo LDH with uniform porosity and high electrochemically active surface area to achieve outstanding electrocatalytic performance for lactate sensing. After optimizing the particle size of ZIF-67 and transformation times, ZIF-67 derived NiCo LDH reached the ultrahigh sensitivity of 83.98 μA mM - 1 cm - 2 at an applied potential of 0.55 V (vs. Ag/AgCl KCl sat’d) in the concentration range from 2 to 26 mM. On the other hand, pioneering works in biosensors for lactate detection in sweat has been encountered major challenges such as noble material usage, immobile power supply, and complicated circuit connection to realize the compact sustainable sensing systems. To solve these restrictions, herein, the self-powered molecular imprinted polymers based triboelectric sensor (MIP-TES) was designed to offer a multifunctional noninvasive approach for specific and simultaneous lactate detection. Free-standing PVDF/graphene flexible electrode modified poly(3-aminophenyl boronic acid) imprinted lactate molecule demonstrated the change of the surface properties afterlactate adsorption. MIP-modified electrode revealed the selective lactate sensing over non molecular imprinted polymers (NIP) electrode through the superior and stable signal change with variation of lactate concentration in human sweat. Moreover, MIP modified lactate sensor was further introduced in the triboelectric nanogenerator system to harvest mechanical energy from contact and separation into electrical output. The ","PeriodicalId":11461,"journal":{"name":"ECS Meeting Abstracts","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135089455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Silver-Based Supportless Membrane Electrode Assemblies for Electrochemical CO₂ Reduction","authors":"Lydia Weseler, Marco Löffelholz, Jens Osiewacz, Thomas Turek","doi":"10.1149/ma2023-01282763mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-01282763mtgabs","url":null,"abstract":"CO 2 is one of the major contributors to the emission of greenhouse gases boosting climate change. Meanwhile, renewable energy production is fluctuating due to weather conditions, demanding for appropriate storage, e. g. by Power-to-X technology. The first step of these processes, the production of hydrogen via water electrolysis, is typically linked to a second step to obtain hydrocarbons [1]. Meanwhile, electrochemical CO 2 reduction (eCO 2 R) is capable of generating chemical feedstocks by converting excess CO 2 , simultaneously using renewable energy sources during peak times. A promising pathway of eCO 2 R focuses on CO, as it can be produced with high selectivity at silver catalysts, concurrently generating hydrogen as the only byproduct [2]. To partly overcome the mass transport limitations resulting from the very limited solubility of CO 2 in aqueous electrolytes, gas diffusion electrodes (GDEs) are typically used for eCO 2 R in a three-chamber setup with anolyte, catholyte and separate gas compartment [3]. However, there are still considerable overpotentials in this setup, among others caused by ohmic losses such as the electrolyte resistance. Employing membrane electrode assemblies (MEAs), either both electrodes or one of them can be combined with the membrane to form a full- or half-MEA, respectively, resulting in a significant decrease in cell voltage. Although there have already been studies on the fabrication of MEAs employing silver catalysts for eCO 2 R [4, 5], they are still very limited in options and mostly based on carbon gas diffusion layers (GDLs). The manufacturing approach applied in this work is based on a catalyst ink recipe for sintered silver GDEs originally developed for chlor-alkali electrolysis by Moussallem et al. [6]. Instead of using Nickel mesh as a substrate, the suspension is spray-coated on a stainless steel plate to enable the required treatment at temperatures above 300 °C. Afterwards, the catalyst layer is hot-pressed on the prepared anion exchange membrane at more moderate temperatures, forming a supportless cathodic half-MEA. Resulting from variations in the manufacturing procedure, different MEAs are electrochemically characterized, examining Faradaic efficiencies as well as cell voltages, also in comparison to measurements performed in three-chamber setup. Addressing challenges in product efficiency and membrane degradation, it is shown that this type of MEA is capable of eCO 2 R to CO, already reducing the cell potential at elevated current densities by nearly 50 %, see fig. 1. [1] Tom Kober et al. Report: perspectives of power-to-X technologies in Switzerland: supplementary report to the white paper . en. Technical report. 2019. doi: 10.3929/ETHZ-B-000525806. [2] Yoshio Hori et al. “Electrocatalytic process of CO selectivity in electrochemical reduction of CO 2 at metal electrodes in aqueous media”. Electrochimica Acta , 39 (11-12), (1994), 1833–1839. [3] Thomas Burdyny and Wilson A. Smith. “CO 2 red","PeriodicalId":11461,"journal":{"name":"ECS Meeting Abstracts","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135089458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electric-Double-Layer (EDL)-Gated FET Aptasensors for Highly Sensitive MMP7 Detection","authors":"Chia Kai Lin, Chia-Che Wu, Akhil Kavanal Paulose, Yueh-Ju Hou, Chee-Seng Lee, Heuy-Ling Chen, Yu-Lin Wang","doi":"10.1149/ma2023-01341921mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-01341921mtgabs","url":null,"abstract":"ABSTRACT Biliary Atresia (BA) is a severe liver disease that affects newborns. This disease may cause cholestasis and progressive hepatic failure or even death if not treated immediately. ELISA blood tests for metabolic screening are the current method of diagnosing BA. However, newborns need rapid BA detection for treatment in the future. The increased matrix metalloproteinase-7 (MMP7) cause BA-related liver fibrosis and newborns diagnosed with BA show higher MMP7 levels than those diagnosed with cholestasis. Several platforms have been developed for the fast detection of Biliary Atresia (BA). Here, we developed an electric-double-layer (EDL)-gated field-effect transistor (FET) platform for Biliary Atresia (BA) detection. The core idea of this sensor array is to use a uniquely designed DNA probe to capture MMP7 proteins and monitor the change in drain current caused by the target capturing. Different concentrations of MMP7 spiked and tested over a functionalized sensor. The simple and cost-effective fabrication and ease of use make this sensor a promising tool as a point care detection device. Keywords: EDL, FET, Biliary atresia, MMP7, Biosensors INTRODUCTION Due to the symptomatic similarity to cholestatic liver diseases, it is challenging to diagnose a precise BA for newborns. False diagnosis may delay timely treatment (e.g., surgery) and worsens the prognosis. However, BA's underlying causes are still unclear. A level increase of intrahepatic matrix metalloproteinase-7 (MMP7) signifies BA-related liver fibrosis. BA cases found in newborns revealed higher MMP7 levels than cholestasis. MMP7 is a protease that contributes to tissue remodeling and breaks down extracellular matrix through a signal pathway. Based on the clinical results, MMP7 has emerged as a novel biomarker for BA diagnosis. ELISA was employed as the current method for detecting Biliary Atresia (BA). However, the procedure of ELISA has shortcomings, such as being time-consuming, high cost, and complicated operation. Hence, rapid and precise diagnostic methods need to be developed. In this work, we propose to detect MMP7 proteins using an electric-double-layer (EDL)-gated field-effect transistor (FET). As shown in Figure 1, The aptamer of MMP7 was immobilized on sensor electrodes, allowing a binding with the protein. As the number of the captured analytes increases; the sensor signals, amplified by a FET, will respond to it. As such, we look forward to detecting MMP7 in serum samples collected from newborns and helping the clinical diagnostics by this EDL-gated FET biosensor. MATERIALS AND METHODS An extended gate chip was employed in the sensor array. The electrode surface was cleaned using oxygen plasma, following which, the probe was immobilized on it. The MMP7 aptamer is mixed with TCEP for 30 minutes at room temperature, TCEP was used as a reducing agent which helps in the formation of dithiol bonds (SS), making the attachment of the probe easier. The mixture solution is then ","PeriodicalId":11461,"journal":{"name":"ECS Meeting Abstracts","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135089462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Consideration of Improved Adhesion of Direct Copper Seed Layer by Medium-Vacuum Sputtering Using Vacuum Ultraviolet Light","authors":"Shinichi Endo, Akihiro Shimizu, Hiroyuki Ueyama, Kazuhiro Fukada, Yuta Kashiwagi, Hirosuke Takamatsu, Kiyoaki Hashimoto, Ryotaro Takahashi","doi":"10.1149/ma2023-01301811mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-01301811mtgabs","url":null,"abstract":"A sputtering method is used to form the seed layer for copper electric plating. In general, copper spatter has weak adhesion to resin, so titanium spatter is combined to increase the adhesion strength. However, etching in the lithography process requires two types of processes, titanium and copper metal. We have reported the improvement of adhesion of copper sputter to glass epoxy resin by medium vacuum sputtering equipment in 242nd ECS meeting. Adhesion strength was improved by performing vacuum ultraviolet treatment as a pretreatment for medium-vacuum sputtering. We discovered the relationship between the hydroxyl groups on the resin surface and the adhesion force by the chemical modification XPS method. Furthermore, by XPS analysis of the peeled copper interface, the adhesion mechanism between the resin and copper due to UV irradiation was estimated. We evaluated the absorption properties in the vacuum ultraviolet region of a thinly processed glass epoxy resin. We investigated the behavior of functional groups at the interface and considered the effect of vacuum ultraviolet rays in the depth direction.","PeriodicalId":11461,"journal":{"name":"ECS Meeting Abstracts","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135089544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}