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Issue 26, 2018
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Nitrogen-promoted molybdenum dioxide nanosheets for electrochemical hydrogen generation

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Abstract

Recently, the hydrogen evolution reaction (HER) via electrocatalytic water splitting has provided a promising and sustainable strategy for energy conversion and storage. A cheap and efficient electrocatalyst composed of earth-abundant elements is needed. Here, we have synthesized new samples of N–MoO2 sheets with excellent stable Pt-like HER performance. A simple and repeatable strategy has been developed via the use of the cheap, simple small organic molecule urea as a reducing agent. We confirm that N doping can induce a disordered surface lattice and increase the number of proton adsorption sites with a relatively weak binding force. Owing to the cooperative effects of surface N doping, disordered surface distortion and the intrinsic nature of MoO2, high HER activity can be achieved, with an overpotential of η = 96 mV vs. RHE at a current density of −10 mA cm−2 and a Tafel slope of 33 mV per decade. Moreover, we further extended the synthesis method to Ni and Co systems with the formation of N–NiO/Ni and N–CoO/Co core–shell structures, which exhibited enhanced HER performance in comparison with bare MO/M (M = metal) samples. This study can help us design new earth-abundant electrocatalysts with further enhancements in catalytic performance.

Graphical abstract: Nitrogen-promoted molybdenum dioxide nanosheets for electrochemical hydrogen generation

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Publication details

The article was received on 20 Apr 2018, accepted on 04 Jun 2018 and first published on 04 Jun 2018


Article type: Paper
DOI: 10.1039/C8TA03638A
Citation: J. Mater. Chem. A, 2018,6, 12532-12540
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    Nitrogen-promoted molybdenum dioxide nanosheets for electrochemical hydrogen generation

    J. Yan, L. Li, Y. Ji, P. Li, L. Kong, X. Cai, Y. Li, T. Ma and S. (. Liu, J. Mater. Chem. A, 2018, 6, 12532
    DOI: 10.1039/C8TA03638A

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