ECS Meeting Abstracts最新文献

{"title":"(Keynote) Releasing the Bubbles: Efficient Phase Separation in (Photo-)Electrochemical Devices in Microgravity Environment","authors":"Katharina Brinkert, Álvaro Romero-Calvo, Oemer Akay, Shaumica Saravanabavan, Eniola Sokalu","doi":"10.1149/ma2023-01562715mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-01562715mtgabs","url":null,"abstract":"One of the major challenges human space exploration faces is the absence of buoyancy forces in orbit. Consequently, phase separation is severely hindered which impacts a large variety of space technologies including propellant management devices, heat transfer and life support systems e.g., during the production of oxygen and the recycling of carbon dioxide. Of particular interest are hereby (photo-)electrochemical (PEC) devices as they can produce essential chemicals such as oxygen and hydrogen in two set-ups: either, by coupling the electrochemical cell to external photovoltaic cells as currently utilized on the International Space Station or by direct utilization of sunlight in a monolithic device, where integrated semiconductor-electrocatalyst systems carry out the processes of light absorption, charge separation and catalysis in analogy to natural photosynthesis in one system. The latter device is particularly interesting for space applications due to present mass and volume constraints. Here, we discuss two combined approaches to overcome phase separation challenges in (photo-)electrolyzer systems in reduced gravitational environments: using the hydrogen evolution reaction (HER) as a model reaction, we combine nanostructured, hydrophilic electrocatalyst surfaces for efficient gas bubble desorption with magnetically-induced buoyancy to direct the produced hydrogen gas bubbles on specific trajectories away from the (photo-)electrode surface. (Photo-)current-voltage ( J-V ) profiles obtained in microgravity environments generated for 9.2 s at the Bremen Drop Tower show that our systems can operate with our two-fold approach near terrestrial efficiencies. Simulations of gas bubble trajectories accompany our experimental observations, allowing us to attribute the achieved phase separation in the PEC cells to the increased electrode wettability as well as the systematic use of diamagnetic and Lorentz forces.","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":"135087529","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":"(Keynote) Electrochemistry on Mars – Two Years of MOXIE (Mars Oxygen ISRU Experiment) Operations Producing Oxygen on the Surface of the Red Planet","authors":"Jeffrey A. Hoffman","doi":"10.1149/ma2023-01562739mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-01562739mtgabs","url":null,"abstract":"By the time of the 243rd ECS, NASA’s Mars2020 Perseverance rover will have spent over two Earth years on the surface of Mars, during which time the MOXIE experiment ( M ars OX ygen I SRU E xperiment) will have produced oxygen at night and in the day during both the annual maximum and minimum atmospheric density periods, as well as at many other times during the year. MOXIE is the first demonstration of the use of indigenous resources (ISRU = In Situ Resource Utilization) on the surface of another planet. This talk will explain how MOXIE works and will present a summary of what MOXIE has accomplished, how its performance on Mars has changed with time, and plans for the future. The paper will also present results from an optimization study of a human-scale MOXIE-type system capable of providing the oxidizer for a 6–person Mars Ascent Vehicle. As an experiment carried inside the rover, MOXIE had to satisfy many constraints that would not apply to an independent, full-scale system. Other potential oxygen-producing technologies should be compared to the optimized human-scale system results summarized in this paper rather than to a simple linear scaling of the mass, power consumption, and oxygen production rate of MOXIE.","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":"135087534","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-Site Deficient Lst-Based Perovskite Fibers with Ni Exsolution for Reversible Solid Oxide Cells","authors":"Jiaming Yang, Yueyue Sun, Lei Fu, Zhengrong Liu, Jun Zhou, Kai Wu","doi":"10.1149/ma2023-0154218mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-0154218mtgabs","url":null,"abstract":"Reversible solid oxide cells (RSOCs) as new energy converting devices with superior conversion efficiency can operate in both fuel cell (FC) mode and electrolysis cell (EC) mode. However, the main challenges for fuel electrode materials are poor electrochemical performance and limited durability due to the sluggish hydrogen catalysis kinetics. Here, we demonstrate an advanced fiber-structured La x Sr x Ti 0.9 Ni 0.1 O 3-δ (LSTNx) architecture with a series of A-site deficiency (x=0.5, 0.45, and 0.4), which can be applied to reversible solid cells as a promising candidate of fuel electrode materials. LSTNx fibers decorated with Ni nanoparticles (NPs) were fabricated via electrospinning technique and in-situ exsolution method. A-site deficiency played a critical role in Ni exsolution and the morphology of LSTNx nanofibers. La 0.4 Sr 0.4 Ti 0.9 Ni 0.1 O 3-δ fibers with moderate A-site deficiency displayed homogeneous Ni NPs on the surface and excellent stability at 800℃ in pure H 2 . A single cell with LSTN0.4 fuel electrode (~40 μm) | GDC barrier layer (~0.5 μm) | SSZ electrolyte (~250 μm) | GDC barrier layer (~0.5 μm) | composite LSCF-GDC air electrode (~40 μm) exhibits maximum power density of 547.44 mW·cm -2 at 800℃ in wet H 2 and the current density of -1.351 A·cm -2 under the potential of 1.5 V in 50% H 2 O/H 2 atmosphere. The 5-cyclic long-term reversible tests of FC and EC modes were carried out under the potential of 0.5/1.5 V for 60 h, respectively. The current density degradation was approximately 0.67% in EC mode and 2.73% in FC mode after 5-cyclic reversible tests in LSTN0.4 single cells, suggesting a reliable fiber-structured architecture for RSOCs. 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":"135087537","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) Current Status of SOFC Deployment and Technology Developments in Korea","authors":"Rak-Hyun Song","doi":"10.1149/ma2023-01546mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-01546mtgabs","url":null,"abstract":"In Korea, the supply of stationary fuel cells for power generation is being promoted by the mandatory RPS program. The deployment of fuel cells in Korea began in 2012. Currently, fuel cells of about 880 MW have been supplied. Among them, the amount of SOFC system is about 220 MW, and the SOFC installation started in 2014. About 40 MW in 2021 and 50 MW in 2022 were installed. The deployment of residential SOFCs has just begun, and a small number of systems have been deployed. In Korea, fuel cell deployment is accelerated by the mandatory supply amount allocated to power generation companies by the RPS policy, and in addition, the clean energy supply promotion regulation granted to public buildings partially contributes to fuel cell supply. Several Korean companies have developed the SOFC and SOEC technologies under the national program, and major projects are the development of a 200 kW SOFC and a 20 kW SOEC systems. The 2~8kW class SOFC products have been developed already and are in deployment. In Korea, SOEC demonstration is being also promoted to store electricity generated from renewable energy, and about 1.5MW SOEC is scheduled to be demonstrated by 2024. The Korean government enacted the Hydrogen Law in 2019, and under this law, development and deployment of hydrogen and fuel cell-related technologies are in progress. In addition, a hydrogen roadmap was established as an implementation plan to encourage achievement of the deployment targets. In this talk, the achievements of the SOFC R&D and deployment, and national hydrogen roadmap in Korea are introduced in more detail.","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":"135087540","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":"La_1.5Sr_1.5Mn_1.5Ni_0.5O₇ _±δ Vs La_1.5Sr_1.5Co_1.5Ni_0.5O₇ _±δ: Exsolved Materials as Anodic Layers for Direct Biogas-Fueled SOFC","authors":"Sebastian Vecino-Mantilla, Massimiliano Lo Faro, Gaetano Squadrito","doi":"10.1149/ma2023-0154174mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-0154174mtgabs","url":null,"abstract":"Currently, one of the main problems in commercial SOFC systems fueled directly with hydrocarbon compounds, such as biogas, is the high risk of blocking the active phase on the anode side ( e.g. Ni-YSZ ) due to carbon formation/deposition during the conversion of fuel into power energy. This issue causes a lowering in the overall performance and durability of the cell. Therefore, to overcome this deactivation mechanism, it was successfully demonstrated that an additional anodic active layer in commercial SOFC using materials based on exsoluted perovskites could be an interesting and viable alternative. This asseveration is based on the fact that using this kind of material is possible to get heterogeneous surface systems with highly stable and electrocatalytically active embedded nanoparticles uniformly distributed on the surface with a high carbon coking tolerance in a hydrocarbon fuel atmosphere. This study aimed to evaluate and compare the electrocatalytic behaviour of two new catalytic materials with Ni exsolution for direct dry biogas-fueled SOFC. The starting materials were Ruddlesden-Popper-type based on a nickel manganite (La 1.5 Sr 1.5 Mn 1.5 Ni 0.5 O 7±δ or LSMN ) and nickel cobaltite (La 1.5 Sr 1.5 Co 1.5 Ni 0.5 O 7±δ or LSCN ). Both materials have been synthesized by the Pechini method using stoichiometric amounts of precursors as nitrates. Once the respective gels have been formed, they were treated in the air at two dwell temperatures, 300°C for 2 h and 500°C for 3 h, to ensure the total elimination of the organic compounds. Finally, the resulting powders were treated in air at 1300°C for 12h and then, physicochemically characterized. For the electrochemical characterization, the as-treated powders were mixed individually with Gd 0.1 Ce 0.9 O 2 ( CGO ) in a weight ratio of 70:30 using a ball milling for 6h. Finally, to get the slurry for the coating layer, each mixture ( LSMN+CGO and LSCN+CGO ) was ground for an additional 2h in the presence of 8 wt % of triethanolamine, 2 wt % polyvinyl butyral resin (BUTVAR B-98) and 2-propanol. Commercial button SOFC cells by InDEC® (anode-supported cell Ni-YSZ/YSZ/LSM) were painted on the anode side getting an active area of 2 cm 2 . The experiments were carried out at 800°C with pre-conditioning using diluted H 2 and then, with simulated dry biogas. A Biologic tool was used as a device for the electrochemical measurements. The purpose of this communication is to present the results of experiments with two button cells derived from the same large area commercial cell (anode supporting cell) coated with the two electrocatalysts developed in this work. The electrochemical test carried out for more than 200 h demonstrated that this external functional layer on the anode side contributes to getting a stable potential within the whole working time at the selected galvanostatic conditions (500 mA cm −2 ). By comparing the results of these two tests, the exsolved LSCN layer showed better perfomances, be","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":"135087866","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":"Fine-Tuning of Air Electrode Microstructure and Its Composition as a Way to Enhance the Performance and Durability of Solid Oxide Electrolyzer - preliminary results","authors":"Anna Niemczyk, Stanisław Jagielski, Ryszard Kluczowski, Jakub Kupecki, Magdalena Kosiorek, Małgorzata Szczygieł","doi":"10.1149/ma2023-0154205mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-0154205mtgabs","url":null,"abstract":"Among actions undertaken to reach a net-zero economy by 2050, implementation of the hydrogen technologies into various sectors e.g. energy and transport seems to be crucial. The significant increase of the installed capacity of electrolyzer in the last few years has been observed, which will accelerate in next decades to meet declared by many countries goals of their national hydrogen strategies. Nowadays, a dominant role on the electrolyze markets possess low temperature solution, namely, alkaline and PEM electrolyzes. However, due to higher efficiency – lower energy demand for hydrogen production, it is forecast that solid oxide electrolyzers (SOE) will take part of the market. The development of SOE, which are on the final R&D phase, is mainly focused on the extension of their lifespan and minimizing their manufacturing costs. The La 1-x Sr x CoO 3-δ (LSC) and La 1-x Sr x Co y Fe 1-y O 3-δ (LSCF) oxides due to their good catalytic activity and high mixed ionic-electronic conductivity are recognized as state-of-the-art air electrodes for SOC. However, Co-based perovskites are characterized by high thermal and chemical expansion, which might cause a mechanical mismatch with electrolyte, resulting in intensified SOC degradation. To mitigate mentioned issues different strategies have been proposed in the literature. Through the combined approach focused on modification of the bulk properties, simultaneously tailoring the microstructure of the electrodes and electrode/solid electrolyte interface, it is possible to overcome the kinetic limitations of operation at decreased temperatures. To maximize cell performance, and prevent the potential electrode degradation (i.e. its delamination) composite GDC-LSC/LSFC electrodes with gradual changes of the composition from electrolyte-electrode interphase to the electrode surface, were proposed. Furthermore, the impact of modification of electrode microstructure by an increase of its porosity and infiltration of the electrode surface with catalytically active oxides (e.g. Pr x O y ) was investigated. Fine-tuning of electrode porosity was achieved by the addition of the pore-forming agent, and the selection of its type (graphite or PMMA), amount, and size of its grains. Moreover, the work presents an approach to optimize the buffer layer, inter alia by its densifying, to mitigate Sr diffusion to the electrolyte and prevent air electrode delamination. The developed composite air electrodes were screen-printed (with an active area of 16 cm 2 ) on the fuel electrode-supported cell and evaluated in the SOE mode at the 650-750 °C temperature range. Tests included measurements of j-V dependences and EIS spectra (at different temperatures, current densities, and for different gas flow delivered at the air side of the cell). In order to assess the impact of the added amount and type of pore-forming agent on the microstructure of the electrode layer, as well as to investigate possible microstructural changes of th","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":"135088319","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":"Spatially Heterogeneous Chemistry Observed using NIRTI on SOFC Anodes","authors":"Elias D Pomeroy, Daniel Steinhurst, Stanislav Tsoi, John David Kirtley, Bryan Eigenbrodt, Jeffrey Owrutsky, William A Maza, Robert A. Walker","doi":"10.1149/ma2023-0154264mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-0154264mtgabs","url":null,"abstract":"Carbon formation remains the primary degradation mechanism for solid oxide fuel cells (SOFCs) operating on carbonaceous fuels. The mechanisms for the remediation of carbon (C) induced degradation via electrochemical gasification and reforming using O 2(g) and H 2 O (g) was studied using Near Infrared Thermal Imaging (NIRTI), Fourier Transform Infrared Emission Spectroscopy (FTIRES), chronoamperometry/chronopotentiometry (CA/CP), and mass spectrometry (MS). Carbon removal follows a stepwise mechanism, first oxidizing surface carbon to CO (g) , and subsequently to CO 2(g) . CO (g) oxidation requires a catalytic surface to form CO 2 which plays a key role in removing C via the reverse Boudouard chemistry. NIRTI reveals spatially heterogenous chemistry and suggests a specific role of surface oxygen species. These species form from dissociative adsorption and non-faradaic oxide flux through the electrolyte, as well as O 2 transport limited processes occurring due to high O 2 utilization. C removal from electrochemical oxidation and steam spatially homogeneous compared to O 2 , due in part to the respective active surface species, and their respective transport limitations. Under O 2 C removal is appears incomplete, despite electrochemical results. These experiments clarify the mechanisms responsible for remediation of C on SOFC anodes and highlight the need of spatially resolved techniques to study SOFCs under operating conditions.","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":"135088328","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":"Automatic Data Curation and Analysis Pipeline for Electrochemical Impedance Spectroscopy Measurements Conducted on Solid Oxide Cell Stacks","authors":"Christian Frederik Mänken, Dominik Schäfer, Rudiger-A Eichel, Felix Kunz","doi":"10.1149/ma2023-015460mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-015460mtgabs","url":null,"abstract":"Abstract To better understand degradation in electrochemical converters and helping to correlate certain phenomena with specific operating conditions, machine learning (ML) methods are increasingly being applied. Success has already been achieved in the field of degradation analysis and prediction of capacity of lithium ion batteries 1 , for instance. In terms of Solid Oxide Cell (SOC) stacks ML methods have been applied mainly with the aim of identification of faulty operation modes and degradation related fault diagnosis 2 . ML approaches usually require a considerable amount of real training data, when used for forecasting models. A data consolidation and curation strategy was developed with the aim of processing the historic long-term test bench data of SOCs collected by Forschungszentrum Jülich over the past years. In comparison to other datasets developed in this field 3 , the one presented in this work contains SOC stack tests in fuel cell operation with significantly longer operating times under load. A compilation of the sample experiments and the consolidation into a hierarchical data format are presented. Further, an essential part of the strategy is the automatic curation and analysis of electrochemical impedance spectroscopy (EIS) measurements, using a specifically developed procedure in Python. The varying quality of measurements from past years, as well as recurring artefacts such as parasitic inductances, can be addressed in this way. Additional distribution of relaxation times (DRT) deconvolutions and equivalent circuit modelling (ECM) are performed, as part of the procedure to automatically retrieve feature values from measurements (cf. Fig. 1). The novel dataset, which to the authors’ knowledge includes some of the longest SOC stack tests available, serves as the basis for several evaluations. In addition to classification and clustering work to derive degradation patterns, in particular based on the EIS data, another focus is on the development of forecasting models. The current work is primarily concerned with long short-term memory (LSTM), as well as regression models that make use of both the time series data and the characterisation measurements, such as EIS. Acknowledgement The authors would like to thank their colleagues at Forschungszentrum Jülich GmbH for their great support and the Helmholtz Society as well as the German Federal Ministry of Education and Research for financing these activities as part of the WirLebenSOFC project (03SF0622B). References 1: Jones, P.K., Stimming, U. & Lee, A.A. Impedance-based forecasting of lithium-ion battery performance amid uneven usage. Nature Communications 13, 4806 (2022). 2: B. Yang et al. Solid oxide fuel cell systems fault diagnosis: Critical summarization, classification, and perspectives. Journal of Energy Storage 34 , 102153 (2021). 3: A.K. Padinjarethil, S. Pollok & A. Hagen. Degradation studies using machine learning on novel solid oxide cell database. Fuel Cells ","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":"135088479","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":"Electrochemical Deposition of Nanocatalysts on an Oxide Scaffold Enhances the Activity of Oxygen Reduction","authors":"Seongwoo Nam, Jinwook Kim, Hyunseung Kim, SungHyun Jeon, Sejong Ahn, Yoonseok Choi, Beom-Kyeong Park, WooChul Jung","doi":"10.1149/ma2023-0154190mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-0154190mtgabs","url":null,"abstract":"Solid oxide fuel cells (SOFCs) are devices that directly convert the chemical energy of hydrogen and oxygen into electrical energy, and are attracting attention for their high efficiency and eco-friendliness. Since the recent research trend is to lower the operating temperature of the device, there is a considerable demand for a way to effectively introduce a catalyst to overcome the poor electrochemical activity of the most commercially available lanthanum strontium manganite–yttria-stabilized zirconia (LSM-YSZ) composite electrode. Praseodymium oxide (PrO x ) is an excellent catalyst for the ORR and has also been applied to LSM-YSZ electrodes via infiltration, the most widely used catalyst fabrication method. However, this previously well-established method still experiences time-consuming and energy-intensive limitations; therefore, other catalyst fabrication approaches are required. Cathodic electrochemical deposition (CELD) is chosen as a central strategy to decorate the PrO x catalyst which strongly empowers the exclusive ORR activity of the LSM-YSZ electrode. CELD is an excellent catalyst fabrication method that combines electroplating and chemical precipitation, and is simple, fast, cost-effective, and capable of deposition at room temperature and ambient pressure. Herein, we present an electrochemical deposition method that fabricating a PrO x overlayer significantly improves the catalytic activity of composite electrodes with only a short process of less than 4 min, even in an ambient environment. Moreover, it does not require additional processes such as heat treatment. The PrO x -coated electrode exhibits a decrease in initial polarization resistance compared to the bare, and maintained an oxygen reduction reaction characteristic by more than 10 times even after about 400 hours of operation at 650 °C. Transmission line model analysis with impedance spectra describes how PrO x improves the reactivity of the oxygen reduction reaction of composite electrodes. Finally, we demonstrate that a two-element material, (Pr, Ce)O x , was electrochemically deposited. Electrochemical deposition considerably improves the catalytic properties of the cathode via a concise and straightforward process.","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":"135088485","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) Leveraging Magnetohydrodynamic Mechanisms for Stable and Efficient Microgravity Electrolysis","authors":"Álvaro Romero-Calvo, Katharina Brinkert","doi":"10.1149/ma2023-01562718mtgabs","DOIUrl":"https://doi.org/10.1149/ma2023-01562718mtgabs","url":null,"abstract":"Water electrolysis is the fundamental chemical process for oxygen and hydrogen production in space. It is widely employed in modern environmental control and life support systems, propulsion technologies, and high-density energy storage devices. Furthermore, future interplanetary missions are likely to employ water as a commodity acquired and processed by In Situ Resource Utilization (ISRU) methodologies to produce propellants, thereby reducing vehicle launch mass. The absence of buoyancy results in major technical challenges for the operation of electrolytic cells in low gravity. The need to detach and collect oxygen and hydrogen bubbles has been traditionally addressed by means of forced water recirculation loops. However, this leads to complex, inefficient, and unreliable liquid management devices composed of multiple elements and moving parts. Two distinct magnetohydrodynamic (MHD) mechanisms may instead be employed to induce phase separation: diamagnetic, and Lorentz forces. The former arises in the presence of strong, inhomogeneous magnetic fields and results in a magnetic buoyancy effect. The latter is a consequence of the imposition of a magnetic field to the current generated between two electrodes. Both approaches can potentially lead to a new generation of electrolytic cells with minimum or no moving parts, hence enabling the human deep space operations with minimum mass and power penalties. Dedicated microgravity experiments are required to study these novel magnetically enhanced electrolysis concepts. This presentation introduces the fundamentals of both methods and discusses the experimental design and results from several experimental campaigns at ZARM’s drop tower and Blue Origin’s New Shepard. The performance of representative electrolytic cells subject to different MHD regimes is addressed from an electrochemical and fluid dynamic perspectives. It is demonstrated that the MHD force effectively detaches and collects gas bubbles in microgravity while increasing the current density and improving the stability of the electrolytic cell. Ultimately, this opens the door for the development of highly-efficient space electrolytic cells with applications to human and robotic space exploration.","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":"135088490","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}