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Self-Supported Nickel Phosphosulphide Nanosheets for Highly Efficient and Stable Overall Water Splitting

Abstract

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 need an overpotential of 52 and 240 mV to achieve a current density of 10 mA/cm2 (j10) in alkaline media, respectively. The DFT calculation results reveal that the electronegative phosphosulfide species shift the ΔGH* to thermo-neutral position and achieve the 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 j10 at a small potential of 1.52 V, and can stably sustain the j10 for 200 h, rivalling the integrated state-of-the-art Pt/C and IrO2.

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Publication details

The article was received on 27 Mar 2017, accepted on 02 Jun 2017 and first published on 02 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA02651J
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Self-Supported Nickel Phosphosulphide Nanosheets for Highly Efficient and Stable Overall Water Splitting

    J. Luo, H. Wang, G. Su, Y. Tang, H. Liu, F. Tian and D. Li, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02651J

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