New Visible-Light-responding Bi₂MoO₆ Films: Preparation, Characterization, And Photoelectrochemical Properties

Series Visible-Light-responding Bi₂MoO₆ Films were successfully synthesized via amorphous complex method and hydrothermal method. SEM,XRD,Raman,AES and DRS were used to characterize the morphology and structure of the products, and the photoelectrochemical properties of the films were measured by using a home-made photoelectrochemical property detecting system. Photoelectrocatalytic degradation of Methylene Blue (MB) at Bi₂MoO₆ film electrode under visible light irradiation was also studied. The main results are as follows:(1) Bi(NO₃)₃, (NH₄)₆Mo₇O₂₄·6H₂O and H₅DTPA were utilized as starting materials to synthesize the amorphous complex precursor, and the Bi₂MoO₆ films on ITO conductive glass with different calcining temperature, different calcining time and different calcining layers were prepared by calcining the amorphous complex precursor. The structure of Bi₂MoO₆ films were influenced by different calcining temperature, different calcining time and different calcining layers. Bi₂MoO₆ films had visible light responding, Under visible light irradiation, the ITO/Bi₂MoO₆ can generate anode photocurrent. The photocurrent and IPCE was influenced by the structure of the film. In our condition, the Bi₂MoO₆ films obtained under 500℃for 1h with 3 layers has the biggest intensity of photocurrent and highest IPCE, the thickness was nearly 100nm.(2) Bi₂MoO₆ films also obtained by hydrothermal spread method. The longest absorbed wavelength of Bi₂MoO₆ films with hydrothermal spread method is longer than those with amorphous complex method. Bi₂MoO₆ films with hydrothermal spread method have larger resistance than those with amorphous complex method, so the recombination of photoelectron was easier, and the photocurrent and photovoltage were smaller.(3) Synergetic degradation of MB was investigated by the combination of electrolysis and photocatalysis using Bi₂MoO₆ film. It has better degradation efficiency than single photocatalytic properties. Because Bi₂MoO₆ film could not degraded MB by applying a bias potential, so Synergetic degradation of MB was electricity assistant photocatalytic process.