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  • Title: Activating a TiO2/BiVO4 Film for Photoelectrochemical Water Splitting by Constructing a Heterojunction Interface with a Uniform Crystal Plane Orientation.
    Author: Liu C, Chen L, Su X, Chen S, Zhang J, Yang H, Pei Y.
    Journal: ACS Appl Mater Interfaces; 2022 Jan 12; 14(1):2316-2325. PubMed ID: 34965083.
    Abstract:
    The construction of a heterojunction has been considered one of the most effective strategies to improve the photoelectrochemical (PEC) performance of photoanodes; however, most researchers only focus on the design and preparation of a novel and efficient heterojunction photoelectrode, and the investigation on the effect of the heterojunction interface structure on PEC performance is ignored. In this work, a TiO2/BiVO4 photoanode with a uniform crystal plane orientation in the heterojunction interface (TiO2-110/BiVO4-202) was prepared by an in situ transformation method. We found that the PEC activity of the TiO2/BiVO4 photoanode can be activated by constructing such a heterojunction interface. Compared with a TiO2/BiVO4 photoanode with a random crystal plane orientation prepared by a simple soaking-calcining method (S-TiO2/BiVO4, 0.04 mA/cm2 at 1.23 VRHE), the TiO2/BiVO4 photoanode prepared by the in situ transformation method (I-TiO2/BiVO4) exhibits a significantly better PEC performance, and the photocurrent density of I-TiO2/BiVO4 is about 2.2 mA/cm2 at 1.23 VRHE under visible light irradiation without a cocatalyst. This is mainly attributed to the fact that I-TiO2/BiVO4 has a faster electron transfer rate in the heterojunction interface according to the results of PEC analysis. Furthermore, density functional theory (DFT) calculations show that the BiVO4-202 surface has a higher Fermi energy level, thereby expediting the photogenerated carrier transport in the heterojunction interface. This work corroborates and strengthens the view that the heterojunction interface structure has a significant effect on the PEC performance.
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