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| Home > Publications database > Localized Electrochemical Characterization of Catalyst-Layers for PEM Water Electrolysis with Scanning Electrochemical Microscopy |
| Poster (After Call) | FZJ-2024-05616 |
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2024
Abstract: Polymer electrolyte membrane (PEM) water electrolysis [1] is a key technology for large scale hydrogen production as a resource and for energy storage. In the immediate future, it will play a vital role in the transformation to a sustainable economy.The core component of PEM water electrolyzers is the catalyst coated membrane (CCM), which can be produced by hot-pressing the cathode and anode catalyst-layers on a proton exchange membrane. [2] Commercial CCMs today mainly rely on platinum-based cathode and iridium-based anode catalysts. In our experience, the electrochemical characterization of the bare CCM is often difficult due to low in-plane conductivity and overlapping currents deriving from the ion conductivity of the membrane. Because of this, the research field is currently highly underdeveloped.Therefore, we decided to approach this field by taking one step back and investigating the catalyst-layer directly. Samples can be prepared with varying methods, catalyst ink compositions, ionomer contents and conditioning protocols. From our study we present preliminary results of the sample preparation and electrochemical investigation of samples.The focus will be on the study of self-prepared samples with scanning electrochemical microscopy (SECM). [3] With this probing technique, local electrochemical properties of a substrate – in our case catalyst-layer samples or CCMs – can be identified. It also reveals the sample homogeneity on the microscale.Funding: This work was financially supported by the Bundesministerium für Bildung und Forschung (BMBF): Wasserstoff - Leitprojekt H2Giga, Teilvorhaben DERIEL (project number 03HY122C), SEGIWA (project number 03HY121B).Literature:[1] A. S. Aricò, S. Siracusano, N. Briguglio, V. Baglio, A. Di Blasi, V. Antonucci, J. Appl. Electrochem. 2013, 43, 107. [2] T. Suzuki, S. Tsushima, S. Hirai, ECS Trans. 2011, 41, 909. [3] D. Polcari, P. Dauphin-Ducharme, J. Mauzeroll, Chem. Rev. 2016, 116, 13234.
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