Electrocatalytic Activity of Hierarchically Nanoporous Au@Ti-SiO2/Ni-W-Co Composite Electrode for Hydrogen Evolution

摘要

Hierarchically nanoporous Ti-SiO2 particles were synthesized by dissolving template method, and the hierarchically nanoporous Au@Ti-SiO2 particles were further prepared by in-situ synthesis method using NaBH4 as reducing agent. The components of the hierarchically nanoporous Au@Ti-SiO2 particles and Ni-W-Co alloy electrode were investigated by energy dispersive spectrometer (EDS). In addition, the hierarchically nanoporous Au@Ti-SiO2/Ni-W-Co composite electrode was fabricated by the method of composite electrodeposition using hierarchically nanoporous Au@Ti-SiO2 particles as composite nanoparticles. Finally, the electrocatalytic activities for hydrogen evolution of different electrodes were investigated. Results showed that, the mass fractions of Ni, W and Co were 62.78%, 11.75% and 25.47% respectively in the coating of Ni-W-Co alloy electrode. The mass fractions of Au and Ti were 0.94% and 4.21% respectively in the hierarchically nanoporous Au@Ti-SiO2 particles which indicated that the Au nanoparticles were successfully doped into the hierarchically nanoporous Ti-SiO2 particles. And the results of electrocatalytic activity study showed that, Co and W have good electrocatalytic activity for hydrogen evolution, which can greatly improve the electrocatalytic activity for hydrogen evolution. The electrocatalytic activity of Ni-W-Co alloy electrode was superior than that of Ni electrode and Ni-Walloy electrode. The electrocatalytic activity for hydrogen evolution of hierarchically nanoporous Au@Ti-SiO2/Ni-W-Co composite electrode was improved because of adding Au@Ti-SiO2 and reached the optimal value when the concentration of nanoporous Au@Ti-SiO2 particles was 1.6 g/ L.