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Xiaojuan Feng,Yanlong Shi,yuanyuan Chen,Zhirong Xu,Haiyu Guan 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
Exploring high-efficient and stable low-cost electrocatalysts is of significant importance for boosting theefficiency of water splitting and purifying urea-enriched wastewater. Herein, bimetallic doping strategywas adopted to obtain jasminum nudiflorum-like Fe, V doped NiS arrays (Fe, V-NiS/NF) via typicalhydrothermal process and subsequent anion exchange reaction. The as-obtained Fe, V-NiS/NF array displayshigh catalytic activity and stability toward oxygen evolution reaction (OER) and urea oxidationreaction (UOR) in alkaline media, with reduced overpotentials of 273 and 214 mV to deliver the currentdensity of 50 mA cm2 for OER and UOR, respectively. More notably, when employing Fe, V-NiS/NF assymmetric electrolytic cell for urea electrolysis, a low cell voltage of 1.45 V is needed at 10 mA cm2,which is about 110 mV lower than the conventional water electrolysis. Meanwhile, the catalyst also displayssuperior stability for over 72 h. Such outstanding performance is attributed to the following points:(i) 3D porous flower-like structure facilitates the mass transfer and abundant exposure of active sites; (ii)in situ growth of catalysts on conductive substrate and the effective interface engineering of differentcomposition shorten the charge transport pathways and expedite electron transfer. Density functionaltheory calculations demonstrate that the Fe and V dopants regulate the electronic environment of Ni sitesand optimize the adsorption free energy of urea. This work provides a universal pathway to design highefficientand non-noble electrocatalysts for H2 production in an energy-saving way via urea electrolysis.