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Improving the Electrocatalytic Activity of Ni Organic Framework toward Oxygen Evolution Reaction by Vanadium Doping.

Metal-organic frameworks (MOFs) have been considered as a potential oxygen evolution reaction (OER) electrocatalysts, owning to their ultra-thin structure, adjustable composition, high surface area, and high porosity. Here, we designed and fabricated a vanadium-doped Ni organic frameworks (V1-x-NixMOF) system using a facile two-step solvothermal method on nickel foam (NF). The doping of V remarkably elevates the OER activity of V1-x-NixMOF, demonstrating better performance than the corresponding single metallic Ni-MOF, NiV-MOF and RuO2 catalysts at high current density (>400 mA cm-2). V0.09-Ni0.91MOF/NF provides a low overpotential of 235 mV and a small Tafel slope of 30.3 mV dec-1 at a current density of 10 mA cm-2. More importantly, the water splitting device assembled with Pt/C/NF and V0.09-Ni0.91MOF/NF as cathode and anode yield cell voltage of 1.96 V@1000 mA cm-2 outperforms the-state-of-the-art RuO2(+)||Pt/C(-). Our work sheds new insight into preparing stable, efficient OER electrocatalysts and a promising method for designing various MOF-based materials.