Journal
NANOSCALE HORIZONS
Volume 4, Issue 5, Pages 1132-1138Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nh00177h
Keywords
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Funding
- National Science Fund for Distinguished Young Scholars [51825103]
- Natural Science Foundation of China [51771188, 51571189]
- Major Program of Development Foundation of Hefei Center for Physical Science and Technology [2017FXZY002]
- Anhui Provincial Natural Science Foundation [1708085QE92]
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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.
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