期刊
ACS APPLIED NANO MATERIALS
卷 2, 期 5, 页码 3091-3099出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.9b00441
关键词
Fe-doped Ni5P4; overall water splitting; hydrogen evolution reaction; oxygen evolution reaction; hydrolysis of NaBH4
资金
- Beijing National Laboratory for Molecular Sciences [BNLMS20160116]
- Key Laboratory of Microsystems and Microstructures Manufacturing of Ministry of Education, Harbin Institute of Technology [2015KM006]
- Heilongjiang Postdoctoral Foundation [LBH-Q16091]
The search for efficient overall water-splitting electrocatalysts plays an important role for low-cost hydrogen production. Metal phosphides are promising for integrating hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) properties in one bifunctional electrode, but several challenges still exist and need to be solved. We report a free-standing carbon cloth electrode consisting of iron (Fe)-doped Nisi), nanosheet arrays via a hydrothermal reaction and subsequent phosphorization, which effectively drives both HER and OER in the base. The as-prepared Fe-doped Ni5P4 with ultralow Fe conent (2.5 atom %) delivers a current density of 10 mA cm(-2) at 131 mV for HER and needs 257 mV to reach a current density of 100 mA cm(-2) for OER Overall, water splitting requires only 1.50 V to reach a current density of 10 mA cm(-2). The introduction of trace Fe in NisP(4) is effective to modulate the adsorption energy of the key intermediates for both HER and OER, which is promising for the rational design of transition-metal phosphides based on bifunctional water-splitting catalysts with high performance. In particular, Fe-doped NisP(4) could effectively catalyze the hydrolysis of NaBH4 with a hydrogen generation rate of 0.175 L g(-1) min(-1) and an activation energy of 53.41 kJ mol(-1), comparable to most transition-metal-based electrocatalysts.
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