Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.137
Publication date: 18th December 2023
The oxygen evolution reaction (OER) is the predominant overall reaction bottleneck in water electrolysis towards achieving the large-scale production of sustainable H2. A proton exchange membrane-based water electrolyzer (PEMWE) shows advantages in operating at higher current densities, low H2 cross-over, and improved energy efficiency; over diaphragm and anion transport-based water electrolysers [1]. However, today´s OER catalysts in acid rely on rare and expensive critical raw materials such as Ir, Pt, or Ru. This limits the broad-scale implementation of PEMWE technology. Hence, the development of new platinum-group metal (PGM)-free electrocatalysts for the OER that combine efficiency and robustness in acidic conditions is paramount for clean H2 production from water [2–3]. We present new Co-based anode catalysts that achieve high activity and stable operation. Our synthetic strategy triggers a structural reconstruction of Co-based oxides that enables a different OER pathway by controlling the local oxide structure. The catalyst achieves 1.8 A‧cm−2 of current density at 2.0 V in PEMWE system at 80˚C using milli-Q water as electrolyte. It exhibited 278 h and 250 h of durability at 0.2 and 1.0 A‧cm−2 of current density, respectively, in industrial relevant conditions. Our study outperforms the durability of benchmark non-PGM catalysts over eight-times in the PEMWE system [2–3].
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