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A nanohybrid consisting of NiPS3 nanoparticles coupled with defective graphene as a pH-universal electrocatalyst for efficient hydrogen evolution

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Abstract

We report metallic NiPS3 nanoparticles decorated defective graphene (NiPS3@DG) as an efficient and durable electrocatalyst for the hydrogen evolution reaction (HER) at all pH values. The nanohybrids exhibited impressive low overpotentials (η10) of 73, 97, and 99 mV at −10 mA cm−2 in acidic (pH ∼ 0), neutral (pH 7) and alkaline (pH 14) electrolyte, respectively, which competes with (or even surpasses) commercial Pt/C (20 wt%) catalysts. Furthermore, the NiPS3@DG electrocatalyst displayed long-term stability and durability in a pH-universal medium as confirmed by a negligible decay in catalytic performances after 40 h of continuous working and 5000 voltammetric sweeping cycles. Theoretical calculations further revealed that the optimal free energy of the hydrogen adsorption process (which stems from a synergistic effect of S and P) provides tremendous contribution to the pH-universal HER process. The design strategy of the di-anion nanohybrid electrocatalyst highlights a new avenue for preparing cost-effective and pH-universal electrocatalysts.

Graphical abstract: A nanohybrid consisting of NiPS3 nanoparticles coupled with defective graphene as a pH-universal electrocatalyst for efficient hydrogen evolution

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Publication details

The article was received on 31 Aug 2017, accepted on 23 Oct 2017 and first published on 23 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07672J
Citation: J. Mater. Chem. A, 2017, Advance Article
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    A nanohybrid consisting of NiPS3 nanoparticles coupled with defective graphene as a pH-universal electrocatalyst for efficient hydrogen evolution

    J. Zhang, R. Cui, X. Li, X. Liu and W. Huang, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA07672J

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