循环伏安法电沉积镍-钴-磷/泡沫镍电极及其析氢催化活性研究

以泡沫镍(NF)为基体,采用循环伏安(CV)电沉积法制备Ni-Co-P/NF催化电极,电沉积液组成和工艺条件为:NiSO4·6H2O 0.07 mol/L,CoSO4·7H2O 0.03 mol/L,NaH2PO2·H2O 0.6 mol/L,扫描电位区间−0.6~−1.2 V(相对于饱和甘汞电极),扫描速率0.01 V/s,扫描14次。采用扫描电镜(SEM)和能谱仪(EDS)分析了电极的表面形貌和元素组成。通过阴极极化曲线和塔菲尔斜率对比了NF、Ni-P/NF和Ni-Co-P/NF电极在1 mol/L NaOH和0.5 mol/L H2SO4溶液中的析氢催化活性,并通过循环伏安和电流密度−时间曲线测试了电极的稳定性。结果表明,Ni-Co-P/NF电极在碱性和酸性条件下都表现出优于Ni-P/NF的析氢活性和稳定性。

Electrodeposition of nickel–cobalt–phosphorus/nickel foam electrode by cyclic voltammetry and study on its catalytic activity in hydrogen evolution reaction

A catalytic Ni Co P/NF electrode was prepared with nickel foam as substrate by cyclic voltammetric (CV) electrodeposition from the bath comprising NiSO4·6H2O 0.07 mol/L, CoSO4·7H2O 0.03 mol/L, and NaH2PO2 H2O 0.6 mol/L within the potential range from 0.6 V to 1.2 V (vs. saturated calomel electrode) at a scanning rate of 0.01 V/s for 14 cycles. The surface morphology and elemental composition were characterized by scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The catalytic activities of NF, Ni P/NF, and Ni Co P/NF electrodes for hydrogen evolution reaction in alkaline and acidic media were compared by measuring the cathodic polarization curves and Tafel plots, and their stabilities were studied via cyclic voltammetry and current density vs. time curve measurement. The results showed that the Ni Co P/NF electrode had better hydrogen evolution activity and stability than Ni P/NF electrode in both alkaline and acidic media.