Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 15, Issue 1, Pages 206-214Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ee02999a
Keywords
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Funding
- European Research Council [681292]
- Marie Skodowska-Curie Fellowship under the European Union's Horizon 2020 research [838367]
- Ministry of Science and Technology, Taiwan [MOST 109-2628-M-002-001-RSP]
- Swiss Naitonal Science Foundation
- Marie Curie Actions (MSCA) [838367] Funding Source: Marie Curie Actions (MSCA)
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By conducting operando UV-Vis, X-ray absorption, and Raman spectroscopy, it has been revealed that the concentration of Fe4+ species at the surface, rather than Co4+ in the bulk, scales with the catalytic activity of CoFeOxHy during the oxygen evolution reaction (OER). These results suggest the presence of an Fe4+-containing active site in CoFeOxHy.
The oxygen evolution reaction (OER) is the bottleneck reaction of water splitting, which can be used to generate green hydrogen from renewable electricity. Cobalt iron oxyhydroxides (CoFeOxHy) are among the most active OER catalysts in alkaline medium. However, the active sites of these catalysts remain unclear. Here we use operando ultraviolet-visible (UV-Vis), X-ray absorption, and Raman spectroscopy to reveal oxidations of both Fe and Co ions in CoFeOxHy during the OER. By analyzing samples with different Fe contents and thickness, we find that the concentration of Fe4+ species at the surface, but not the concentration of Co4+ in the bulk, scales with the catalytic activity. These results indicate an Fe4+-containing active site in CoFeOxHy.
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