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The rational design of high-efficiency electrocatalysts for application in water oxidation in alkaline media remains a great challenge. In this paper, Ni 3+ -rich nanograss-like Mo-doped Ni 3 S 2 /NiS/VS arrays grown on nickel foam (denoted as Mo-NiVS@NF) have been successfully constructed through a hydro/solvothermal method. Interestingly, Mo-NiVS@NF exhibits superior catalytic OER performance, needing an overpotential of 217 mV to drive a current density of 10 mA cm -2 , outperforming most previously reported NiS-based electrocatalysts. The result indicates that the Ni 3+ -rich active sites caused by the modulation of the electronic structure environment via the introduction of V and high-valency Mo play an important role in the high activity for the OER. Moreover, this catalyst shows high long-term electrochemical durability.

Construction of Ni3+-rich nanograss arrays for boosting alkaline water oxidation

Construction of Ni³⁺-rich nanograss arrays for boosting alkaline water oxidation