期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 10, 页码 2975-2979出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201411072
关键词
core-shell nanoparticles; oxide supports; oxygen evolution reaction; water splitting; X-ray photoelectron spectroscopy
资金
- German Research Foundation (DFG) [STR 596/3-1, 1613]
- DOE grant [DE-SC0006877]
- DOE [DEAC02-06CH11357]
- German Academic Exchange Service (DAAD)
- U.S. Department of Energy (DOE) [DE-SC0006877] Funding Source: U.S. Department of Energy (DOE)
Active and highly stable oxide-supported IrNiOx core-shell catalysts for electrochemical water splitting are presented. IrNix@IrOx nanoparticles supported on high-surface-area mesoporous antimony-doped tin oxide (IrNiOx/Meso-ATO) were synthesized from bimetallic IrNix precursor alloys (PA-IrNix/Meso-ATO) using electrochemical Ni leaching and concomitant Ir oxidation. Special emphasis was placed on Ni/NiO surface segregation under thermal treatment of the PA-IrNix/Meso-ATO as well as on the surface chemical state of the particle/oxide support interface. Combining a wide array of characterization methods, we uncovered the detrimental effect of segregated NiO phases on the water splitting activity of core-shell particles. The core-shell IrNiOx/Meso-ATO catalyst displayed high water-splitting activity and unprecedented stability in acidic electrolyte providing substantial progress in the development of PEM electrolyzer anode catalysts with drastically reduced Ir loading and significantly enhanced durability.
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