Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 137, Issue 48, Pages 15090-15093Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b10699
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Funding
- NSF CCI grant [CHE-1305124]
- DOE [DE-AC02-06CH11357, COMPRES]
- NSF [DMR-1508558]
- China Scholarship Council
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1508558] Funding Source: National Science Foundation
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Nickel-iron oxides/hydroxides are among the most active electrocatalysts for the oxygen evolution reaction. In an effort to gain insight into the role of Fe in these catalysts, we have performed operando Mossbauer spectroscopic studies of a 3:1 Ni:Fe layered hydroxide and a hydrous Fe oxide electrocatalyst. The catalysts were prepared by a hydrothermal precipitation method that enabled catalyst growth directly on carbon paper electrodes. Fe4+ species were detected in the NiFe hydroxide catalyst during steady-state water oxidation, accounting for up to 21% of the total Fe. In contrast, no Fe's was detected in the Fe oxide catalyst. The observed Fe4+ species are not kinetically competent to serve as the active site in water oxidation; however, their presence has important implications for the role of Fe in NiFe oxide electrocatalysts.
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