Preparation of Nano-crystalline TiO_2 Film Modified Ni-W-P Electrode and Its Photoelectrocatalytic Activity for Hydrogen Evolution Reaction

After electrodeposion of Ni-W-P alloy on Cu sheet,nano-crystalline TiO_2 film modi- fied Ni-W-P electrode was prepared by a sol-gel method.Scanning electron microscope(SEM),X-ray diffraction(XRD)and cathodic polarization curves were used to characterize the surface morphology, microstructure and catalytic activity for hydrogen evolution reaction(HER)of TiO_2/Ni-W-P electrodes. Effects of the sintering temperature and the thickness of TiO_2 film on the structure and performance of TiO_2/Ni-W-P electrodes were researched.The results clearly demonstrate that the TiO_2/Ni-W-P electrode annealed at 550℃for 1h has the best photoelectrocatalytic activity for HER,and the over- potential for HER decreases about 140mV under illumination.The TiO_2 film with average grain size of 7nm is mixed crystal structure containing anatase and rutile crystal phases.