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Title: | Standardizing OER Electrocatalyst Benchmarking in Aqueous Electrolytes: Comprehensive Guidelines for Accelerated Stress Tests and Backing Electrodes | Authors: | Zlatar, Matej Escalera-Lopez, Daniel Rodriguez, Miquel Gamon Hrbek, Tomas Goetz, Carina MARY JOY, Rani Savan, Alan Tran , Hoang Phi Nong, Hong Nhan POBEDINSKAS, Paulius Briega-Martos, Valentin Hutzler, Andreas Boehm, Thomas HAENEN, Ken Ludwig, Alfred Khalakhan, Ivan Strasser, Peter Cherevko, Serhiy |
Issue Date: | 2023 | Publisher: | AMER CHEMICAL SOC | Source: | ACS Catalysis, 13 (23) , p. 15375 -15392 | Abstract: | The scarcity of iridium, needed to catalyze the sluggish oxygen evolution reaction (OER), hinders large-scale hydrogen production with proton exchange membrane water electrolyzers (PEMWEs). Crucial steps require reducing its loading while improving its overall activity and stability. Despite knowledge transfer challenges, cost and time constraints still favor aqueous model systems (AMSs) over real devices for the OER electrocatalyst testing. During AMS testing, benchmarking strategies such as accelerated stress tests (ASTs) aim at improving catalyst lifetime estimation compared to constant current loads. This study systematically evaluates a commercial Ir catalyst by modifying both AST parameters and the employed backing electrodes to examine their impact on activity-stability relationships. A comprehensive set of spectroscopy and microscopy techniques, including in situ inductively coupled plasma mass spectrometry, is employed to monitor Ir and backing electrode modifications. Our findings demonstrate that the choice of both lower potential limit (LPL) in ASTs and backing electrode significantly influences the estimation of Ir-based electrocatalysts' activity and stability. Unique degradation mechanisms, such as passivation, redeposition on active sites, and contribution to the OER, were observed for different backing electrodes at varying LPLs. These results emphasize the importance of optimizing parameters and electrode selection in ASTs to accurately assess the electrocatalyst performance. Furthermore, they establish the foundation for developing relevant standardized test protocols, enabling the cost-effective development of high-performance catalysts for PEMWE applications. | Notes: | Zlatar, M; Cherevko, S (corresponding author), Forschungszentrum Julich, Helmholtz Inst Erlangen Nurnberg Renewable Energy, D-91058 Erlangen, Germany.; Zlatar, M (corresponding author), Friedrich Alexander Univ Erlangen Nurnberg, Dept Chem & Biol Engn, D-91058 Erlangen, Germany. m.zlatar@fz-juelich.de; s.cherevko@fz-juelich.de |
Keywords: | oxygen evolution reaction;iridium;acceleratedstress test;dissolution;glassy carbon;boron-doped diamond;gold | Document URI: | http://hdl.handle.net/1942/41987 | ISSN: | 2155-5435 | e-ISSN: | 2155-5435 | DOI: | 10.1021/acscatal.3c03880 | ISI #: | 001113315400001 | Rights: | 2023 The Authors. Published by American Chemical Society. This article is licensed under CC-BY 4.0 | Category: | A1 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
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