Abstract
The development of efficient and robust electrocatalysts for overall water splitting (OWS) has a crucial effect on alleviating energy and environmental issues. Herein, an integrated electrode of hierarchical NiCo2S4 nanotube@NiMoO4 nanosheet arrays on nickel foam (NiCo2S4@NiMoO4/NF) is constructed via hydrothermal reaction. And the heterostructure can form the strong electron interaction and synergistic effect between NiCo2S4 and NiMoO4. Therefore, the NiCo2S4@NiMoO4/NF electrode exhibits prominent electrocatalytic performances with low overpotentials for oxygen and hydrogen evolution reaction (OER: 285 mV; HER: 197 mV) at the current density of 100 mA cm−2. Moreover, low potentials of 1.46, 1.63, and 1.75 V are needed to reach 10, 50, and 100 mA cm−2 and outstanding stability of 100 h is exhibited using NiCo2S4@NiMoO4/NF as a bifunctional electrocatalyst for OWS, which is superior over most of previously reported cobalt- and nickel-based electrocatalysts. These outstanding performances benefit from the unique hierarchical structure that combines the advantages of the nanosheet/nanotube and binder-free electrode, the specialty of NiCo2S4 and NiMoO4 in HER and OER, and the protective effect of the NiMoO4, which synergistically enhance the catalytic activity and stability of OWS.
Published Version
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