Porous NiMoO₄₋ₓ/MoO₂ hybrids as highly effective electrocatalysts for the water splitting reaction
2018
Zhang, Zhe | Ma, Xingxing | Tang, Jilin
The rational design of an optimal bifunctional electrocatalyst for water splitting with low cost and high activity is greatly desired for the realization of efficient conversion and storage of sustainable energy. Herein, a novel NiMoO₄₋ₓ/MoO₂ hybrid electrocatalyst with atomic-level coupled nanointerfaces and plentiful Mo⁵⁺ species is reported. The NiMoO₄₋ₓ/MoO₂ electrocatalyst shows excellent electrocatalytic performances for both the HER and the OER in alkaline media with Tafel slopes of 31 and 69 mV dec⁻¹, and a current density of 10 mA cm⁻² at overpotentials of 41 and 233 mV for the HER and OER, respectively. The NiMoO₄₋ₓ/MoO₂ can further work as bifunctional electrode materials for overall water splitting and achieves a current density of 10 mA cm⁻² at a voltage of only 1.56 V.
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