ECS advances最新文献

Communication — The Impact of Co-solvent Selection for Dimethyl-2,5-dioxahexane carboxylate in Sodium Ion Batteries 交流--钠离子电池中 2,5-二氧六环羧酸二甲酯助溶剂选择的影响

ECS advances Pub Date : 2024-05-21 DOI: 10.1149/2754-2734/ad4e48

Rishivandhiga Jayakumar, V. Shipitsyn, Chanmonirath (Michael) Chak, Wenhua Zuo, Bing Sun, Xiaochuan Lu, Lin Ma

引用次数: 0

La-based Transition Metal Oxide Perovskites as Electrocatalysts for Electrochemical Carbon Dioxide Reduction 作为电化学二氧化碳还原的电催化剂的镭基过渡金属氧化物包荧光体

ECS advances Pub Date : 2024-04-23 DOI: 10.1149/2754-2734/ad41ed

Madhurima Barman, S. Kobi, Arindam Sarkar

{"title":"La-based Transition Metal Oxide Perovskites as Electrocatalysts for Electrochemical Carbon Dioxide Reduction","authors":"Madhurima Barman, S. Kobi, Arindam Sarkar","doi":"10.1149/2754-2734/ad41ed","DOIUrl":"https://doi.org/10.1149/2754-2734/ad41ed","url":null,"abstract":"\u0000 We report here the feasibility of using LaTMO3-based perovskites (TM = Co, Cr, Fe, Mn, Ni, i.e., non-Cu 3d transition metals) as electrocatalysts for electrochemical CO2 reduction reaction (eCO2RR). Phase pure LaTMO3s, having TM-ions in multiple oxidation states for all and O-defects for LaFeO3 and LaNiO3, have been synthesized and tested as electrocatalysts for eCO2RR in fuel cell type set-up. The above characteristics of the La-TM-oxides have been found to influence the current densities during eCO2RR at the various applied potentials, with favorable effects of the presence of O-defects (as for LaFeO3 and LaNiO3). Upon eCO2RR, both C1 and C2 liquid products have been obtained, including ethanol, with a partial current density of -2.66 mA/cm2 at -1.2 V vs. RHE (for LaFeO3). The types of products and the faradic efficiencies have been found to depend on the TM-ion present (in the LaTMO3); in particular, the oxidation state(s), associated O-defect(s) and electronic conductivity. Furthermore, the electrocatalysts have been found to be stable during eCO2RR. Overall, the present work highlights the potential of La-TM-oxide perovskites for usage as stable electrocatalysts for eCO2RR, and also provides insights into the proper selection of ‘TM’ and reaction conditions for obtaining the desired product(s).","PeriodicalId":489350,"journal":{"name":"ECS advances","volume":"57 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140666676","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}

引用次数: 0

Exhaustive Study of Electrical Conductivity in the MNb2-xTixO6-0.5x (M = Mg, Ca, Zn; x = 0, 0.1, 0.2) Columbites 对 MNb2-xTixO6-0.5x（M = Mg、Ca、Zn；x = 0、0.1、0.2）哥伦布石导电性的详尽研究

ECS advances Pub Date : 2024-04-16 DOI: 10.1149/2754-2734/ad3f31

Yelizaveta A. Morkhova, Mariia Koroleva, Anastasia V Egorova, Aleksei Krasnov, Inna Starostina, Artem Kabanov

{"title":"Exhaustive Study of Electrical Conductivity in the MNb2-xTixO6-0.5x (M = Mg, Ca, Zn; x = 0, 0.1, 0.2) Columbites","authors":"Yelizaveta A. Morkhova, Mariia Koroleva, Anastasia V Egorova, Aleksei Krasnov, Inna Starostina, Artem Kabanov","doi":"10.1149/2754-2734/ad3f31","DOIUrl":"https://doi.org/10.1149/2754-2734/ad3f31","url":null,"abstract":"\u0000 The CaNb2O6 and ZnNb2O6 columbites (Sp.gr. Pbcn) were studied as oxygen ion conductors both theoretically and experimentally. A theoretical approach included geometrical-topological analysis, bond valence site energy (BVSE) and density functional theory (DFT) calculations. The BVSE approach showed the possibility of pure oxygen ions diffusion with migration energies less than 0.45 eV in both compounds. However, DFT calculations indicated the possibility of diffusion of both anions and cations. The single-phases columbites were synthesized by the Pechini method for accurately determine charge carriers type and investigated by impedance spectroscopy, by the Tubandt method, which confirmed the absence of cationic conductivity, and measured the electrical conductivity as a function of oxygen partial pressures. The CaNb2O6 sample had the pure oxygen-ionic conductivity ∼2×10-6 S cm–1 at 800 °C (Ea = 0.82 eV), while the ZnNb2O6 had a similar conductivity value due to mixed ionic-electronic contribution (Ea = 0.83 eV). The electromotive force method also showed the predominance of the ionic type of conductivity in CaNb2O6, while ZnNb2O6 has a mixed conductivity with ion transport number of about 0.4. Additionally, we synthesized Ti-doped samples MNb2-xTixO6-0.5x (M = Mg, Ca; x = 0.1, 0.2) to study the doping effect on conducting properties.","PeriodicalId":489350,"journal":{"name":"ECS advances","volume":"32 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140696734","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}

引用次数: 0

Oscillating Oxygen Concentration Transport through PEM Fuel Cell Gas Diffusion Layer: Variation of the Phase Angle 通过 PEM 燃料电池气体扩散层的振荡氧浓度传输：相位角的变化

ECS advances Pub Date : 2024-04-10 DOI: 10.1149/2754-2734/ad3cf4

A.A. Kulikovsky

引用次数: 0

Shedding Light on the Failure Factors of Subsea Critical Fastener Bolts 揭示海底关键紧固件螺栓的失效因素

ECS advances Pub Date : 2024-04-04 DOI: 10.1149/2754-2734/ad3a7c

O. Medlinsky, Constantinos Hadjistassou, Amir Eliezer

{"title":"Shedding Light on the Failure Factors of Subsea Critical Fastener Bolts","authors":"O. Medlinsky, Constantinos Hadjistassou, Amir Eliezer","doi":"10.1149/2754-2734/ad3a7c","DOIUrl":"https://doi.org/10.1149/2754-2734/ad3a7c","url":null,"abstract":"\u0000 Offshore facilities, such as oil and gas rigs, wind turbines, and related subsea equipment, typically use flanges fastened using bolts and nuts as the main connectors. In this study, multidisciplinary parameters, namely the preload torque used to tighten bolts, simulated subsea water currents, water temperature, and impressed current cathodic protection, were applied to ASTM A193 B7 bolts. An experimental supervisory control and data acquisition system was designed to obtain measurements every 5 min throughout a 21-day experiment. Finite element analysis was performed to predict the structurally vulnerable areas of the bolts. A strong correlation was found between the reference electrode readings and the measured electrical current, tightening torque, and water temperature. As the water temperature rises during the day, the reference electrode reading becomes less negative and the electrical current decreases. Subsea water currents cause about a four-time increase in the bolt corrosion rate, with unprotected bolts suffering a nine-time-higher corrosion rate than protected bolts. A unique supply–demand interaction is observed; less protection is supplied to areas with lower corrosion rates (lower demand for protection). Finally, scanning electron microscopy examination reveals new insights into the failure mechanisms of subsea bolts.","PeriodicalId":489350,"journal":{"name":"ECS advances","volume":"31 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140743692","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}

引用次数: 0

Experimental Design of High-Performing Open-Cathode Polymer Electrolyte Membrane Fuel Cells 高性能开放式阴极聚合物电解质膜燃料电池的实验设计

ECS advances Pub Date : 2024-03-07 DOI: 10.1149/2754-2734/ad3121

Anand Sagar, S. Chugh, E. Kjeang

{"title":"Experimental Design of High-Performing Open-Cathode Polymer Electrolyte Membrane Fuel Cells","authors":"Anand Sagar, S. Chugh, E. Kjeang","doi":"10.1149/2754-2734/ad3121","DOIUrl":"https://doi.org/10.1149/2754-2734/ad3121","url":null,"abstract":"\u0000 Open-cathode polymer electrolyte membrane fuel cells (PEMFCs) utilize a unique air-cooled system design to eliminate the humidifiers, air compressor, and liquid cooling loop of conventional, liquid-cooled PEMFC systems, thereby greatly reducing system cost. However, the open-cathode PEMFC performance is restricted by poor humidification, high membrane and charge transfer resistances, and overheating due to inefficient thermal and water management. This work aims to strategically modify the membrane electrode assembly (MEA) design to overcome these issues and achieve high open-cathode PEMFC performance that approaches that of liquid-cooled systems. The use of thinner membrane along with short side chain ionomer is found to elevate the cell performance due to increased water retention at the cathode catalyst layer (CCL) and decreased ohmic losses. Thinner gas diffusion layers with high porosity enable additional cell performance increment by improving oxygen availability at the CCL. An overall current density rise of 88% at 0.6 V and 53% at 0.4 V is achieved by the strategically designed MEA for open-cathode cells. The enhanced power density enabled by the custom MEA can both reduce the stack cost and expand the power range of open-cathode PEMFCs, thus expanding their potential use for low-cost fuel cell system applications.","PeriodicalId":489350,"journal":{"name":"ECS advances","volume":"32 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140077238","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}

引用次数: 0

Texture and Bandgap Tuning of Phase Pure Cu2O Thin Films Grown by a Simple Potentiostatic Electrodeposition Technique 利用简单的静电电沉积技术生长的纯相 Cu2O 薄膜的纹理和带隙调节

ECS advances Pub Date : 2024-03-02 DOI: 10.1149/2754-2734/ad2f46

S. Farhad, Md Moazzem Hossain, M. S. Bashar, N. Tanvir, Suravi Islam

引用次数: 0

Perspective—A New View on the Mechanism of the Hydrogen Evolution Reaction on Various Transition Metal Electrodes 透视--各种过渡金属电极上氢气进化反应机理的新观点

ECS advances Pub Date : 2024-02-15 DOI: 10.1149/2754-2734/ad29d4

Youyi Sun

引用次数: 0

Perspective—A New View on the Mechanism of the Hydrogen Evolution Reaction on Various Transition Metal Electrodes 透视--各种过渡金属电极上氢气进化反应机理的新观点

ECS advances Pub Date : 2024-02-15 DOI: 10.1149/2754-2734/ad29d4

Youyi Sun

引用次数: 0

Comparative Thermal Insulation Nature of Ca2FeMnO6-δ and Sr2FeMnO6-δ Ca2FeMnO6-δ 和 Sr2FeMnO6-δ 的隔热性能比较

ECS advances Pub Date : 2024-02-09 DOI: 10.1149/2754-2734/ad27dc

Ram Krishna Hona, Ebony Schultz, Mandy Guinn, Alexa D. Azure

{"title":"Comparative Thermal Insulation Nature of Ca2FeMnO6-δ and Sr2FeMnO6-δ","authors":"Ram Krishna Hona, Ebony Schultz, Mandy Guinn, Alexa D. Azure","doi":"10.1149/2754-2734/ad27dc","DOIUrl":"https://doi.org/10.1149/2754-2734/ad27dc","url":null,"abstract":"\u0000 We investigated the utility of Ca2FeMnO6-δ and Sr2FeMnO6-δ as materials with low thermal conductivity, finding potential applications in thermoelectrics, electronics, solar devices, and gas turbines for land and aerospace use. These compounds, characterized as oxygen-deficient perovskites, feature distinct vacancy arrangements. Ca2FeMnO6-δ adopts a brownmillerite-type orthorhombic structure with ordered vacancy arrangement, while Sr2FeMnO6-δ adopts a perovskite cubic structure with disordered vacancy distribution. Notably, both compounds exhibit remarkably low thermal conductivity, measuring below 0.50 Wm-1K-1. This places them among the materials with the lowest thermal conductivity reported for perovskites. The observed low thermal conductivity is attributed to oxygen vacancies and phonon scattering. Interestingly as scanning electron microscopy images show the smaller grain size, our findings suggest that the creation of vacancies and lowering the grain size or increasing the grain boundaries play a crucial role in achieving such low thermal conductivity values. This characteristic enhances the potential of these materials for applications where efficient heat dissipation, safety, and equipment longevity are paramount.","PeriodicalId":489350,"journal":{"name":"ECS advances","volume":"312 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139848304","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}

引用次数: 0