期刊
ADVANCED MATERIALS
卷 30, 期 18, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201707522
关键词
atomic iridium; cobalt hydroxide; neutral electrolyte; oxygen evolution reaction; X-ray absorption spectra
类别
资金
- Ministry of Science and Technology of China [2017YFA0303500, 2014CB848900]
- National Natural Science Foundation of China (NSFC) [U1532112, 11574280, 11605201, 21706248]
- Innovative Research Groups of NSFC [11621063]
- Chinese Academy of Sciences (CAS) [QYZDB-SSW-SLH018]
- China Postdoctoral Science Foundation [BH2310000033]
- CAS
- Innovative Program of Development Foundation of Hefei Center for Physical Science [T6FXCX003]
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University [B12015]
Developing highly efficient catalysts for oxygen evolution reaction (OER) in neutral media is extremely crucial for microbial electrolysis cells and electro-chemical CO2 reduction. Herein, a facile one-step approach is developed to synthesize a new type of well-dispersed iridium (Ir) incorporated cobalt-based hydroxide nanosheets (nominated as CoIr) for OER. The Ir species as clusters and single atoms are incorporated into the defect-rich hydroxide nanosheets through the formation of rich Co-Ir species, as revealed by systematic synchrotron radiation based X-ray spectroscopic characterizations combining with high-angle annular dark-field scanning transmission electron microscopy measurement. The optimized CoIr with 9.7 wt% Ir content displays highly efficient OER catalytic performance with an overpotential of 373 mV to achieve the current density of 10 mA cm(-2) in 1.0 m phosphate buffer solution, significantly outperforming the commercial IrO2 catalysts. Further characterizations toward the catalyst after undergoing OER process indicate that unique Co oxyhydroxide and high valence Ir species with low-coordination structure are formed due to the high oxidation potentials, which authentically contributes to superior OER performance. This work not only provides a state-of-the-art OER catalyst in neutral media but also unravels the root of the excellent performance based on efficient structural identifications.
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