期刊
NANO RESEARCH
卷 12, 期 6, 页码 1431-1435出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-019-2379-7
关键词
water splitting; catalysis; nanostructured materials; hydrogen evolution; chemical mapping
类别
资金
- US Department of Energy [DOE DE-SC0016165]
- National Natural Science Foundation of China
- National Key Research and Development Project of China [2016YFF0204402]
- National Science Foundation [ECCS-1542152]
- Key Research Program of Frontier Sciences of Chinese Academy of Sciences (CAS)
- National Natural Science Foundation of China [51622211]
- U.S. Department of Energy (DOE) [DE-SC0016165] Funding Source: U.S. Department of Energy (DOE)
Neutral water splitting is attractive for its use of non-corrosive and environmentally friendly electrolytes. However, catalyst development for hydrogen and oxygen evolution remains a challenge under neutral conditions. Here we report a simple electrodeposition and reductive annealing procedure to produce a highly active Ni-Co-Cr metal/metal oxide heterostructured catalyst directly on Ni foam. The resulting electrocatalyst for hydrogen evolution reaction (HER) requires only 198 mV of overpotential to reach 100 mA/cm(2) in 1 M potassium phosphate (pH = 7.4) and can operate for at least two days without significant performance decay. Scanning transmission electron microscopy coupled with electron energy loss spectroscopy (STEM-EELS) imaging reveals a Ni-Co alloy core decorated with blended oxides layers of NiO, CoO and Cr2O3. The metal/metal oxide interfaces are suggested to be responsible for the high HER activity.
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