期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 28, 页码 14865-14872出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta02651j
关键词
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资金
- National Natural Science Foundation of China [20976201, 31200438]
- Scientific Research Fund of Hunan Provincial Education Department [09C1014]
- graduate's Scientific Research Foundation of Central South University of Forestry and Technology [CX2016B06]
Self-supported nickel phosphosulfide (NiP0.62S0.38) nanosheets are fabricated by convenient one-step programming annealing in phosphorus and sulfur gas in series. The as-prepared NiP0.62S0.38 only needs overpotentials of 52 and 240 mV to achieve a current density of 10 mA cm(-2) (j(10)) in alkaline media for HER and OER, respectively. The DFT calculation results reveal that the electronegative phosphosulfide species shift Delta G(H)* to the thermo-neutral position and achieve a balance of hydrogen adsorption and detachment on nickel sites. The excellent OER activity of NiP0.62S0.38 is attributed to the formation of NiP0.62S0.38/NiOOH heterojunctions during water oxidation. Two identical NiP0.62S0.38 electrodes as anode and cathode are utilized to construct an alkaline electrolyzer, which delivers a j(10) at a small potential of 1.52 V, and can stably sustain the j(10) for 200 h, rivalling the integrated state-of-the-art Pt/C and IrO2.
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