两步电沉积构建NiFe/Ni_(3)S_(2)/NF分级异质电极用于大电流密度析氧反应

Two-Step Electrodeposition Construction of NiFe/Ni_(3)S_(2)/NF Hierarchical Heterogeneous Electrode for Enhanced Oxygen Evolution Reaction at Large Current Densities

通过简便的两步电沉积法在泡沫镍表面有效复合非晶态Ni_(3)S_(2)材料与富缺陷的NiFe双金属羟基氧化物,从而构建了NiFe/Ni_(3)S_(2)/NF三维分级纳米异质电极。受益于非晶态Ni_(3)S_(2)和富缺陷NiFe材料的结构和催化优势,以及异质界面的强电子相互作用,使得NiFe/Ni_(3)S_(2)/NF催化电极表现出优异的析氧催化性能:达到100 mA·cm^(-2)时的析氧过电位仅为273 mV,远优于大多数已报道的Ni/Fe基复合材料。值得注意的是,在1 mol·L^(-1)KOH溶液中,仅需~372 mV的过电位即可稳定输出1000 mA·cm^(-2)的高电流密度达27 h以上。

A simple two-step electrodeposition method was applied to effectively integrate the amorphous Ni_(3)S_(2)material and the defect-rich NiFe bimetallic oxyhydroxide on the surface of the nickel foam,thereby constructing a NiFe/Ni_(3)S_(2)/NF three-dimensional hierarchical heterogeneous electrode.Benefiting from the structural and catalytic advantages of amorphous Ni_(3)S_(2)and defect-rich NiFe materials,as well as the strong electronic interaction at the heterogeneous interface,the NiFe/Ni_(3)S_(2)/NF catalytic electrode exhibited excellent oxygen evolution performance:only an overpotential of 273 mV was needed to attain a current density of 100 mA·cm^(-2),which is far superior to most of the reported Ni/Fe-based composite materials.It can stably output a high current density of 1000 mA·cm^(-2)at the overpotential of 372 mV for more than 27 h in 1 mol·L^(-1)KOH solution.