期刊
SCIENCE
卷 334, 期 6061, 页码 1383-1385出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1212858
关键词
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资金
- Chesonis Foundation
- Natural Sciences and Engineering Research Council of Canada
- Robert A. Welch Foundation
- U.S. Department of Energy Hydrogen Initiative [DE-FG02-05ER15728]
- MRSEC of the National Science Foundation [DMR 08-019762]
- U.S. Department of Energy, Division of Material Sciences and Division of Chemical Sciences [DE-AC02-98CH10886]
- Office of Naval Research
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [819762] Funding Source: National Science Foundation
The efficiency of many energy storage technologies, such as rechargeable metal-air batteries and hydrogen production from water splitting, is limited by the slow kinetics of the oxygen evolution reaction (OER). We found that Ba(0.5)Sr(0.5)Co(0.8)Fe(0.2)O(3-delta) (BSCF) catalyzes the OER with intrinsic activity that is at least an order of magnitude higher than that of the state-of-the-art iridium oxide catalyst in alkaline media. The high activity of BSCF was predicted from a design principle established by systematic examination of more than 10 transition metal oxides, which showed that the intrinsic OER activity exhibits a volcano-shaped dependence on the occupancy of the 3d electron with an e(g) symmetry of surface transition metal cations in an oxide. The peak OER activity was predicted to be at an e(g) occupancy close to unity, with high covalency of transition metal-oxygen bonds.
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