Ina Reichmann, Vicent Lloret, Konrad Ehelebe, Pascal Lauf, Ken Jenewein, Karl J. J. Mayrhofer, Serhiy Cherevko
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In this proof-of-concept work, standard fuel cell electrodes are investigated at elevated oxygen reduction reaction current densities, while dissolved Pt<sup><i>x</i>+</sup> ions in the electrolyte and gaseous CO<sub>2</sub> in the outlet gas stream are detected to track platinum dissolution and carbon corrosion, respectively. Relevant current densities of up to 0.75 A cm<sup>–2</sup> are demonstrated. The electrochemically active surface area, oxygen reduction reaction activity, and Pt dissolution rates are quantified and benchmarked to the values obtained in the conventional stationary GDE half-cell. Moreover, it is found that Pt dissolution is suppressed when O<sub>2</sub> is purged into the catalyst layer. Overall, this work demonstrates the feasibility of fast fuel cell electrode screening obtaining, complementary to electrochemical, mass spectrometry data necessary in fundamental studies on structure/performance relationships under actual reaction conditions. 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引用次数: 0
摘要
扫描气体扩散电极(S-GDE)半电池是改进电化学能量转换技术中所用电极评估的一种新工具。它通过应用电感耦合等离子体质谱法和在线气体质谱法等耦合质谱技术,实现了对真实催化剂层的快速筛选和基础研究。因此,拟议的装置克服了水模型系统和完整细胞级研究的局限性,弥补了这两种方法之间的差距。在这项概念验证工作中,研究人员在较高的氧还原反应电流密度下对标准燃料电池电极进行了研究,同时检测了电解液中溶解的铂x+离子和出口气流中的气态二氧化碳,以分别跟踪铂溶解和碳腐蚀情况。相关的电流密度高达 0.75 A cm-2。对电化学活性表面积、氧还原反应活性和铂溶解速率进行了量化,并与传统固定式 GDE 半电池中获得的数值进行了比较。此外,研究还发现,当 O2 进入催化剂层时,铂的溶解会受到抑制。总之,这项工作证明了燃料电池电极快速筛选的可行性,除了电化学数据外,还能获得在实际反应条件下进行结构/性能关系基础研究所需的质谱数据。本研究中使用的 Pt/C 与燃料电池的应用相关,但所建议的设置可用于水电解、二氧化碳转化、金属空气电池和其他邻近技术。
Scanning Gas Diffusion Electrode Setup for Real-Time Analysis of Catalyst Layers
The scanning gas diffusion electrode (S-GDE) half-cell is introduced as a new tool to improve the evaluation of electrodes used in electrochemical energy conversion technologies. It allows both fast screening and fundamental studies of real catalyst layers by applying coupled mass spectrometry techniques such as inductively coupled plasma mass spectrometry and online gas mass spectrometry. Hence, the proposed setup overcomes the limitations of aqueous model systems and full cell-level studies, bridging the gap between the two approaches. In this proof-of-concept work, standard fuel cell electrodes are investigated at elevated oxygen reduction reaction current densities, while dissolved Ptx+ ions in the electrolyte and gaseous CO2 in the outlet gas stream are detected to track platinum dissolution and carbon corrosion, respectively. Relevant current densities of up to 0.75 A cm–2 are demonstrated. The electrochemically active surface area, oxygen reduction reaction activity, and Pt dissolution rates are quantified and benchmarked to the values obtained in the conventional stationary GDE half-cell. Moreover, it is found that Pt dissolution is suppressed when O2 is purged into the catalyst layer. Overall, this work demonstrates the feasibility of fast fuel cell electrode screening obtaining, complementary to electrochemical, mass spectrometry data necessary in fundamental studies on structure/performance relationships under actual reaction conditions. While Pt/C, in relevance to its fuel cell application, is used in this study, the proposed setup can be applied in water electrolysis, CO2 conversion, metal-air batteries, and other neighbor technologies.
期刊介绍:
ACS Measurement Science Au is an open access journal that publishes experimental computational or theoretical research in all areas of chemical measurement science. Short letters comprehensive articles reviews and perspectives are welcome on topics that report on any phase of analytical operations including sampling measurement and data analysis. This includes:Chemical Reactions and SelectivityChemometrics and Data ProcessingElectrochemistryElemental and Molecular CharacterizationImagingInstrumentationMass SpectrometryMicroscale and Nanoscale systemsOmics (Genomics Proteomics Metabonomics Metabolomics and Bioinformatics)Sensors and Sensing (Biosensors Chemical Sensors Gas Sensors Intracellular Sensors Single-Molecule Sensors Cell Chips Arrays Microfluidic Devices)SeparationsSpectroscopySurface analysisPapers dealing with established methods need to offer a significantly improved original application of the method.