| Noble metal Pt-based materials,having excellent catalytic hydrogen evolution performance,are promising catalysts for preparing clean energy.To alleviate the problem that Pt resources are scarce,expensive,and difficult for industrial applications,the one-dimensional ordered WO3 nanopore substrate has been prepared to construct the Pt-based heterostructure catalysts utilizing the methods of anodization and pulse electrodeposition.Specially,the effect of electrodeposition parameters on heterostructures and the influence of doping one-dimensional ordered WO3 nanoporous with phosphorus or nitrogen on the electrochemical performance of Pt-based heterostructure catalysts have been comprehensively investigatied.Specific research contents are as follows:First,the one-dimensional ordered WO3 nanopore was prepared by anodization.To determine the optimal experimental conditions,the effects of anodizing temperature and time on the surface morphology of the product were studied systematically.After that,Pt was deposited on one-dimensional ordered WO3 nanopore substrate by pulse electrodeposition to construct the WO3/Pt heterostructure.Additionally,the influence of pulse electrodeposition parameters on the deposition of Pt nanoparticles was also discussed.It can be found that the electrocatalytic hydrogen evolution performance of the one-dimensional ordered WO3 nanopore surface modified with Pt were significantly improved,and the photocurrent response was also from 64?A·cm-2 to 198?A·cm-2,which was double.Then,by doping P into the one-dimensional ordered WO3 nanopore,the effect of doping P on the electrocatalytic performance of WO3/Pt was investigated,the results of which indicated that the performance of electrocatalytic hydrogen evolution and activity of the methanol electrocatalytic oxidation were improved significantly by constructing the P-WOX/Pt heterostructure.Furthmore,the effect of amount of doping P on the heterostructure properties was addressed by changing the doping time.The results show that when the phosphating time is 120 min,hydrogen evolution performance of P-WOX/Pt heterostructure dropped to 38 mV,relatively good catalytic activity.However,the catalytic current drops below 0.2 mA·cm-2 after 168 s,and the stability is poor.Consequently,in order to further improve the electrocatalytic activity and stability of the heterostructures,the one-dimensional ordered WO3 nanopore was heated in NH3atmosphere,and the N-WOX/Pt heterostructure was constructed by pulse electrodeposition.The effect of doping N on the properties of heterostructures was investigated.The N-WOX/Pt heterostructure doped with nitrogen for 120 min possessed an initial hydrogen evolution potential of 43 mV,When the current density was 10mA·cm-2,the corresponding overpotential is only 81 mV.The electrocatalytic hydrogen evolution performance was excellent;as for electrocatalytic oxidation of methanol,and the current density was still as high as 0.194mA·cm-2 after 600 s,If/Ib value was as high as 1.92,indicating that the material had improved stability to methanol electrocatalytic oxidation and exhibits excellent anti-poisoning ability. |
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