Optimization and characterization of nickel-cobalt-selenide nanostructuressynthesized by cyclic voltammetry electrodeposition as HER electrocatalyst

The construction and activity of self-supported porous nanostructure electrocatalyst(NixCo۱x)۲Se@Graphite Sheet in alkaline hydrogen evolution reaction (HER) has been investigated. Ina first step, the main parameters involved in the easy preparation, cheap and one-step cyclicvoltammetry (CV) electrodeposition method, have been Statistically optimized. To modeling andoptimization the main factors involved in this method containing: potential scan rate(SR), cyclenumbers (CN) and metal cation ratio (Ni/Co%) from robust response surface methodology(RSM)based on inscribed central composite experimental design (ICCD) is used.In the second step, the optimum condition obtained from the suggested model based on varianceanalysis (ANOVA) at different pH values was synthesized, then its catalytic activity was studied.Based on the quadratic model, the best predicted nanostructure, with potential scan rate of ۱۰ mV.s۱ with۴۰ cycles and ratio of ۱:۲ of Ni:Co at pH equal to ۲, at current density of ۱۰۰mA.cm-۱ only requires -۲۲۵mV overpotential to carry out hydrogen gas in ۱M NaOH alkaline media, which indicates thefavorable activity of this catalyst in the hydrogen Evolution reaction.

Keywords:

Nickel-cobalt-selenide , Hydrogen evolution reaction , Electrodeposition , Cyclic voltammetry , CCD.