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Hierarchical hetero-Ni3Se4@NiFe LDH micro/nanosheets as efficient bifunctional electrocatalysts with superior stability for overall water splitting

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Abstract

Hierarchical hetero-Ni3Se4@NiFe LDH (layered double hydroxide) micro/nanosheets were prepared by coupling NiFe LDH nanosheets with Ni3Se4 micro-sized sheets, and could be used as effective bifunctional electrocatalysts for water splitting. Benefiting from the strong electronic interaction between the NiFe LDH nanosheets and Ni3Se4 micro-sized sheets, the hierarchical hetero-Ni3Se4@NiFe LDH micro/nanosheets are endowed with enhanced charge transfer and reaction kinetics. As a result, the obtained hierarchical hetero-Ni3Se4@NiFe LDH/CFC (carbon fiber cloth) electrode shows optimized hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) properties in alkaline medium with a small overpotential of 85 mV and 223 mV at the current density of 10 mA cm−2, respectively. When the hierarchical hetero-Ni3Se4@NiFe LDH/CFCs are used as bifunctional electrodes for overall water splitting in a two-electrode electrolyzer, the current density of 10 mA cm−2 is derived at a cell voltage of 1.54 V. Moreover, due to the stability of the novel hierarchical hetero-micro/nanostructure, the as-prepared Ni3Se4@NiFe LDH/CFC exhibited high stability in the electrochemical processes over 100 h. This work highlights the importance of constructing efficient bifunctional electrocatalysts for overall water splitting by rational design of heterostructures.

Graphical abstract: Hierarchical hetero-Ni3Se4@NiFe LDH micro/nanosheets as efficient bifunctional electrocatalysts with superior stability for overall water splitting

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Publication details

The article was received on 17 Mar 2019, accepted on 12 Apr 2019 and first published on 12 Apr 2019


Article type: Communication
DOI: 10.1039/C9NH00177H
Nanoscale Horiz., 2019, Advance Article

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    Hierarchical hetero-Ni3Se4@NiFe LDH micro/nanosheets as efficient bifunctional electrocatalysts with superior stability for overall water splitting

    T. Zhang, L. Hang, Y. Sun, D. Men, X. Li, L. Wen, X. Lyu and Y. Li, Nanoscale Horiz., 2019, Advance Article , DOI: 10.1039/C9NH00177H

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