Synthesis and hydrogen evolution performance of nanoporous NiO-Ni/Al3Ni2 composite catalysts
Producing hydrogen through water electrolysis technology is a clean and environmentally friendly method of hydrogen generation.However,the key to realizing the industrial-scale application of water electroly-sis for hydrogen production lies in the development of efficient,stable and cost-effective catalysts for the hydro-gen evolution reaction.In this work,a nanoporous NiO-Ni/Al3Ni2 composite catalyst was prepared by combi-ning the dealloying method and electrochemical oxidation treatment.Due to the synergistic effects of the Ni,Al3Ni2 and NiO tri-phases,the NiO-Ni/Al3Ni2 composite catalyst exhibited excellent electrocatalytic activity for water splitting and hydrogen evolution.By adjusting the parameters of the electrochemical oxidation treat-ment,composite catalysts with different compositional ratios could be obtained.Among them,the NiO-Ni/Al3Ni2-10s catalyst showed the optimal hydrogen evolution reaction catalytic performance,requiring only 79.1 mV of overpotential to achieve a current density of 10 mA/cm2 in alkaline media,while also demonstrating excellent long-term stability.This research provides valuable insights and references for the development of high-activity and high-stability nickel-based hydrogen evolution catalysts.
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