https://scholars.lib.ntu.edu.tw/handle/123456789/606872
Title: | Tracking high-valent surface iron species in the oxygen evolution reaction on cobalt iron (oxy)hydroxides | Authors: | Lee S Moysiadou A Chu Y.-C HAO MING CHEN Hu X. |
Keywords: | Cobalt compounds;Iron compounds;Oxygen;X ray absorption;Active oxygen;Active site;Alkaline media;Fe and Co;Iron species;Operando;Oxyhydroxides;Renewable electricity;Water splitting;]+ catalyst;Catalyst activity;chemical reaction;concentration (composition);detection method;hydroxide;intertidal environment;iron | Issue Date: | 2022 | Journal Volume: | 15 | Journal Issue: | 1 | Start page/Pages: | 206-214 | Source: | Energy and Environmental Science | Abstract: | 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. This journal is ? The Royal Society of Chemistry. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85124201163&doi=10.1039%2fd1ee02999a&partnerID=40&md5=6c448b52770afb966d9378ad5fdecb32 https://scholars.lib.ntu.edu.tw/handle/123456789/606872 |
ISSN: | 17545692 | DOI: | 10.1039/d1ee02999a |
Appears in Collections: | 化學系 |
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