期刊
ADVANCED FUNCTIONAL MATERIALS
卷 28, 期 14, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201706847
关键词
bifunctional electrocatalysts; hydrogen evolution reaction (HER); metal phosphide; oxygen evolution reaction (OER); synergistic effect
类别
资金
- BMBF-project Struktursolar
- China Ministry of Science and Technology [2016YFA0202802]
- National Natural Science Foundation of China [21403280]
3D hierarchical heterostructure NiFe LDH@ NiCoP/NF electrodes are prepared successfully on nickel foam with special interface engineering and synergistic effects. This research finds that the as-prepared NiFe LDH@ NiCoP/NF electrodes have a more sophisticated inner structure and intensive interface than a simple physical mixture. The NiFe LDH@ NiCoP/NF electrodes require an overpotential as low as 120 and 220 mV to deliver 10 mA cm(-2) for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1 M KOH, respectively. Tafel and electrochemical impedance spectroscopy further reveal a favorable kinetic during electrolysis. Specifically, the NiFe LDH@ NiCoP/NF electrodes are simultaneously used as cathode and anode for overall water splitting, which requires a cell voltage of 1.57 V at 10 mA cm(-2). Furthermore, the synergistic effect of the heterostructure improves the structural stability and promotes the generation of active phases during HER and OER, resulting in excellent stability over 100 h of continuous operation. Moreover, the strategy and interface engineering of the introduced heterostructure can also be used to prepare other bifunctional and cost-efficient electrocatalysts for various applications.
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