The rational design of cost-effective,highly efficient,and stable Ru-based electrocatalysts as substitutes for Pt in the hydrogen evolution reaction(HER)is highly desirable and has garnered significant attention.Const...The rational design of cost-effective,highly efficient,and stable Ru-based electrocatalysts as substitutes for Pt in the hydrogen evolution reaction(HER)is highly desirable and has garnered significant attention.Constructing core-shell nanostructures has emerged as an effective approach for regulating the interaction among diverse components,potentially enhancing structural stability and catalytic activity.Herein,we report a facile synthesis of Au@RuNi NWs via the epitaxial growth of a uniform fcc-structured RuNi alloy layer on the surface of ultrathin Au NWs.The prepared Au@RuNi NWs exhibit a remarkable alkaline HER performance with only a 19 mV overpotential to achieve a current density of 10 mA cm^(-2),with a small Tafel slope of 32.63 mV dec^(−1)and outstanding stability.The ultrathin 1D core-shell nanowire structure and the alloying effect of Ni within the fcc-RuNi alloy shell layer facilitate the water dissociation,resulting in accelerated alkaline HER kinetics.This work provides a facile method to rationally design and synthesize core-shell Ru-based electrocatalysts for extraordinary HER performance under alkaline conditions.展开更多
基金funded by the National Natural Science Foundation of China(22202104,22279062,22232004,32101474,42377249)Natural Science Foundation of Jiangsu Province(BK20220933)+1 种基金Jiangsu Undergraduate Training Program for Innovation and Entrepreneurship(S202210288055)ShuangChuang Doctor Plan of Jiangsu Province(JSSCBS20220273).
文摘The rational design of cost-effective,highly efficient,and stable Ru-based electrocatalysts as substitutes for Pt in the hydrogen evolution reaction(HER)is highly desirable and has garnered significant attention.Constructing core-shell nanostructures has emerged as an effective approach for regulating the interaction among diverse components,potentially enhancing structural stability and catalytic activity.Herein,we report a facile synthesis of Au@RuNi NWs via the epitaxial growth of a uniform fcc-structured RuNi alloy layer on the surface of ultrathin Au NWs.The prepared Au@RuNi NWs exhibit a remarkable alkaline HER performance with only a 19 mV overpotential to achieve a current density of 10 mA cm^(-2),with a small Tafel slope of 32.63 mV dec^(−1)and outstanding stability.The ultrathin 1D core-shell nanowire structure and the alloying effect of Ni within the fcc-RuNi alloy shell layer facilitate the water dissociation,resulting in accelerated alkaline HER kinetics.This work provides a facile method to rationally design and synthesize core-shell Ru-based electrocatalysts for extraordinary HER performance under alkaline conditions.
