Preparation And Performance Study Of Ternary Ni-based Electrocatalyst For Water Splitting

The electrocatalytic water splitting reaction is consists of the hydrogen evolution reaction(HER)at the cathode and the oxygen evolution reaction(OER)at the anode.In order to improve the catalytic activity of water splitting reaction and reduce the overpotential required by reaction.The developing of an earth-abundant electrocatalyst which can replace noble metal catalysts has important scientific significance and application value.Ni-based materials are considered to the most promising electrocatalysts for water splitting.In this essay,the electrochemical galvanostatic deposition method was used to prepare NiCuMo electrocatalyst.The factors such as solvent concentration and deposition time were studied comprehensively.A robust NiCuMo electrocatalyst electrode with optimal Mo and Cu content was synthesized.The crystal composition,surface morphology and valence state of the electrode materials were analyzed by XRD SEM and XPS,respectively.The LSV was used to test the HER performance of NiCuMo electrode.In 1 M KOH,the onset overpotential is as low as 45 mV,and the Tafel slope is only 41 mV dec-1.And in 0.5 M H2SO4,the onset overpotential is as low as 48 mV,and the Tafel slope was only 36 mV dec-1.Furthermore,the optimized NiCuMo catalyst exhibits excellent stability in both alkaline and acidic electrolytes.Based on the Ni20Fe10Al70(at.%)alloy ribbon,the Al was removed by dealloying in NaOH-H2O2 solution.Then the self-supporting NiFe-based high efficiency OER electrocatalyst with a nanowire porous structure was obtained.The crystalline structure and surface morphology of as-prepared catalyst were analyzed by XRD and SEM,respectively.And the etched NiFe catalyst exhibit excellent OER activity under alkaline condition.In 1 M KOH,the onset overpotential is as low as 230 mV,and the Tafel slope is only 46 mV dec-1.And the NiFe catalyst has exhibit excellent level at the durable and ECSA testing.