期刊
SCIENCE CHINA-MATERIALS
卷 64, 期 7, 页码 1662-1670出版社
SCIENCE PRESS
DOI: 10.1007/s40843-020-1566-6
关键词
bifunctional electrocatalysis; oxygen evolution reaction; phosphides; layered double hydroxides; water splitting
资金
- Hunan Provincial Science and Technology Plan Project [2017TP1001, 2020JJ4710]
- National Key R&D Program of China [2018YFB0704100]
- State Key Laboratory Fund
The NiFe LDH@CoP/NiP3 electrocatalyst showed satisfactory OER activity and good stability for water splitting. With a current density of 82 mA cm(-2) at 300 mV overpotential, it outperformed CoP/NiP3 and NiFe LDH by 9.1 and 2.3 times, respectively.
It is a great challenge to develop highly active oxygen evolution reaction (OER) electrocatalysts with superior durability. In this study, a NiFe layered double hydroxide-decorated phosphide (NiFe LDH@CoP/NiP3) was constructed to display satisfactory OER activity and good stability for water splitting in alkaline media. At an overpotential of 300 mV, NiFe LDH@CoP/NiP3 achieved a current density of 82 mA cm(-2) for the OER, which was 9.1 and 2.3 times that of CoP/NiP3 and NiFe LDH, respectively. Moreover, the reconstruction behavior, during which oxyhydroxides formed, was studied by a combination of X-ray photoelectron spectroscopy, Raman spectroscopy, and scanning electron microscopy. A synergistic effect between NiFe LDH and CoP/NiP3 was also observed for the hydrogen evolution reaction. Furthermore, when NiFe LDH@CoP/NiP3 acted as both the cathode and anode for overall water splitting, a high current density of 100 mA cm(-2) was maintained for more than 275 h. In addition, under Xe light irradiation, a solar to hydrogen efficiency of 9.89% was achieved for solar-driven water splitting. This work presents the coupling of different active compositions, and can provide a reference for designing bi-functional electrocatalysts.
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