Improving the Electrocatalytic Activity of a Nickel‐Organic Framework toward the Oxygen Evolution Reaction through Vanadium Doping
Hongbo Yu, Lixia Wang, Huatong Li, Zuyang Luo, Tayirjan Taylor Isimjan, Xiulin Yang
Abstract
Abstract Metal‐organic frameworks (MOFs) have been considered as 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 nickel organic framework (V 1− x −Ni x MOF) system by using a facile two‐step solvothermal method on nickel foam (NF). The doping of vanadium remarkably elevates the OER activity of V 1− x −Ni x MOF, thus demonstrating better performance than the corresponding single metallic Ni‐MOF, NiV‐MOF and RuO 2 catalysts at high current density (>400 mA cm −2 ). V 0.09 −Ni 0.91 MOF/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, a water‐splitting device assembled with Pt/C/NF and V 0.09 −Ni 0.91 MOF/NF as cathode and anode yielded a cell voltage of 1.96 V@1000 mA cm −2 , thereby outperforming the‐state‐of‐the‐art RuO 2 (+) ||Pt/C (−) . Our work sheds new insight on preparing stable, efficient OER electrocatalysts and a promising method for designing various MOF‐based materials.