Self-Supported Co-VS₂@MoS₂ Heterostructure for Boosting Overall Water Splitting

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It is highly desirable to develop highly effective and cost-efficient non-noble-metal electrocatalysts for water splitting. Herein, Co-doped VS 2 @MoS 2 heterostructure with nanorod arrays morphology on nickel foam (Co-VS 2 @MoS 2 /NF) were synthesized by a facile hydrothermal method. The as-obtained Co-VS 2 @MoS 2 /NF heterostructure catalyst exhibits remarkably electrocatalytic activity as a bifunctional catalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1.0 M KOH, benefiting from largely exposed edge active sites, fast electron transport, and strong electronic interactions between MoS 2 and Co-VS 2 . Co-VS 2 @MoS 2 /NF catalyst requires an overpotential of 73.4 and 161.3 mV at a current density of 10 mA cm –2 for HER and OER, respectively. Furthermore, the electrolyzer with Co-VS 2 @MoS 2 /NF as both the cathode and the anode shows a low cell voltage of 1.53 V at 10 mA cm –2 and excellent long-term durability.