Yu Hongbo, Wang Lixia, Li Huatong, Luo Zuyang, Isimjan Tayirjan Taylor, Yang Xiulin
Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, P. R. China.
Saudi Arabia Basic Industries Corporation (SABIC) at, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
Chemistry. 2022 Oct 26;28(60):e202201784. doi: 10.1002/chem.202201784. Epub 2022 Aug 31.
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 -Ni 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 -Ni MOF, thus demonstrating better performance than the corresponding single metallic Ni-MOF, NiV-MOF and RuO catalysts at high current density (>400 mA cm ). V -Ni MOF/NF provides a low overpotential of 235 mV and a small Tafel slope of 30.3 mV dec at a current density of 10 mA cm . More importantly, a water-splitting device assembled with Pt/C/NF and V -Ni MOF/NF as cathode and anode yielded a cell voltage of 1.96 V@1000 mA cm , thereby outperforming the-state-of-the-art RuO ||Pt/C . Our work sheds new insight on preparing stable, efficient OER electrocatalysts and a promising method for designing various MOF-based materials.
金属有机框架材料（MOFs）因其超薄结构、可调节组成、高比表面积和高孔隙率而被视为潜在的析氧反应（OER）电催化剂。在此，我们通过在泡沫镍（NF）上采用简便的两步溶剂热法设计并制备了一种钒掺杂的镍有机框架（V -Ni MOF）体系。钒的掺杂显著提高了V -Ni MOF的OER活性，因此在高电流密度（>400 mA cm ）下表现出比相应的单一金属Ni-MOF、NiV-MOF和RuO催化剂更好的性能。在电流密度为10 mA cm 时，V -Ni MOF/NF提供了235 mV的低过电位和30.3 mV dec的小塔菲尔斜率。更重要的是，以Pt/C/NF和V -Ni MOF/NF分别作为阴极和阳极组装的水分解装置在1000 mA cm 时的电池电压为1.96 V，从而优于目前最先进的RuO ||Pt/C 。我们的工作为制备稳定、高效的OER电催化剂提供了新的见解，并为设计各种基于MOF的材料提供了一种有前景的方法。
