4 years ago

Thin-Layered Cobalt-Based Catalysts on Stainless-Steel Microfibers for the Efficient Electrolysis of Water

Thin-Layered Cobalt-Based Catalysts on Stainless-Steel Microfibers for the Efficient Electrolysis of Water
Insu Kim, Yujin Gu, Yoon Sung Nam
Herein, we introduce a highly catalytic core–shell microfiber electrode based on a cobalt oxygen-evolving catalyst (Co-OEC) electrodeposited on a three-dimensional (3 D) mat of stainless-steel (SS) microfibers. The resulting core–shell microfibers (Co-MF) with a catalytic shell exhibit a turnover frequency and a current density that are much higher than those of a conventional Co-OEC on a flat SS foil (Co-F) at neutral pH. The onset potential of the catalytic wave of Co-MF is also appreciably lower than that of Co-F owing to a combination of the higher surface activity of the Co-OEC and the enhanced local electric field in the 3 D network of the metal microfibers. This study suggests that cost-effective, stable, and earth-abundant SS microfibers can be a promising substrate to enhance the surface activity of water-oxidation electrocatalysts. True as steel: We report the efficient electrolysis of water by cobalt-based water-oxidation catalysts electrodeposited on a 3 D mat of stainless-steel microfibers to form a core–shell structure. Owing to the high surface activity of the cobalt-based catalysts and an enhanced local electric field, the core–shell catalysts exhibit exceedingly high catalytic performance for water oxidation at a neutral pH.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/cctc.201700382

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