Preparation and hydrogen evolution performance of Ag2S modified TiO2 nanotubes composite electrode
The Ag2S/TNTs hydrogen evolution electrode was prepared by chemical bath deposition of Ag2S on highly ordered TiO2 nanotubes(TNTs)using sodium sulfide and silver nitrate as starting materials.Scanning e-lectron microscopy(SEM),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)were used to characterize the electrodes.The results showed that Ag2S particles were uniformly deposited on the surface of TiO2 nanotubes without destroying the original morphology and structure of the nanotubes.The hydrogen evo-lution performance of the composite electrode with different deposition cycles of Ag2S was analyzed by linear sweep voltammetry(LSV),Tafel curve,double layer capacitance analysis and electrochemical impedance spec-troscopy(EIS)at room temperature of 0.5 mol/L H2SO4.Compared with TNTs,Ag2S/TNTs showed better hydrogen evolution performance.When the number of Ag2S deposition cycles is 9,the overpotential of the prepared composite electrode reaches 288.14 mV at the current density of 10 mA/cm2,the Tafel slope is 61.8 mV/dec,the double layer capacitance is 54.7 mF/cm2,and the internal resistance of charge transfer is reduced to 0.7 Ω/cm2.
Ag2STiO2 nanotubesdepositionelectrocatalytic hydrogen evolutionelectrocatalytic complete hy-drolysis of water
万方数据
