期刊
CHEMISTRY OF MATERIALS
卷 26, 期 5, 页码 1889-1895出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm4040903
关键词
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资金
- NSFC
- Program for New Century Excellent Talents in Universities
- Beijing Nova Program [Z121103002512023]
- 973 Program [2011CBA00503]
- 863 Program [2012AA03A609]
- Fundamental Research Funds for the Central Universities
The design and fabrication of efficient and inexpensive electrodes for use in the oxygen evolution reaction (OER) is essential for energy-conversion technologies. In this study, high OER performance is achieved using novel hierarchical ZnxCo3-xO4 nanostructures constructed with small secondary nanoneedles grown on primary rhombus-shaped pillar arrays. The nanostructures have large roughness factor, high porosity, and high active-site density. Only a small overpotential of similar to 0.32 V is needed for a current density of 10 mA/cm(2) with a Tafel slope of 51 mV/decade. The nanostructures are also found to perform significantly better than pure Co3O4 and a commercial Ir/C catalyst and to perform similarly to the best OER catalysts that have been reported for alkaline media. These merits combined with the satisfactory stability of the nanostructures indicate that they are promising electrodes for water oxidation.
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