Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 17, Pages 8628-8635Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp3126768
Keywords
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Funding
- U.S. Department of Energy Hydrogen Initiative program [DE-FG02-05ER15728]
- Office of Naval Research (ONR) [N00014-12-1-0096, N00014-12-WX20818]
- U.S. Department of Energy, Division of Material Sciences and Division of Chemical Sciences [DE-AC02-98CH10886]
- National Science Foundation [1122374]
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While many perovskites. remain crystalline during the oxygen evolution reaction (OER) in alkaline media, some highly active perovskites become amorphous. We studied the local structure changes of perovskites LaCoO3, Ba0.5Sr0.5Co0.8Fe0.2O3-delta, and SrCo0.8Fe0.2O3-delta before and after OER by X-ray absorption spectroscopy. No change in either local structure or OER activity was observed for LaCoO3, while considerably enhanced OER activities and the conversion of the local structure from corner sharing octahedra to edge sharing octahedra were noted for Ba0.5Sr0.5Co0.8Fe0.2O3-delta and SrCo0.8Fe0.2O3-delta as a result of the OER. Possible processes responsible for the structural change and enhanced OER activities are discussed.
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