Improving the Electrocatalytic Activity of a Nickel-Organic Framework toward the Oxygen Evolution Reaction through Vanadium Doping |
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Authors: | Hongbo Yu Lixia Wang Huatong Li Zuyang Luo Dr Tayirjan Taylor Isimjan Prof?Dr Xiulin Yang |
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Institution: | 1. Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004 P. R. China
These authors contributed equally to this work.;2. Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004 P. R. China;3. Saudi Arabia Basic Industries Corporation (SABIC) at, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900 Saudi Arabia |
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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 (V1?x?NixMOF) system by using a facile two-step solvothermal method on nickel foam (NF). The doping of vanadium remarkably elevates the OER activity of V1?x?NixMOF, thus 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, a water-splitting device assembled with Pt/C/NF and V0.09?Ni0.91MOF/NF as cathode and anode yielded a cell voltage of 1.96 V@1000 mA cm?2, thereby outperforming the-state-of-the-art RuO2(+)||Pt/C(?). Our work sheds new insight on preparing stable, efficient OER electrocatalysts and a promising method for designing various MOF-based materials. |
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Keywords: | electrocatalysis ion doping metal-organic frameworks oxygen evolution reaction overall water splitting |
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