In Situ Fabrication of 1D WO 3 Nanorod/2D ZnWO 4 Nanosheet Heterojunction for Enhanced Photoelectrochemical Performance

The 1D WO 3 nanorod/2D ZnWO 4 nanosheet heterojunction arrays were successfully fabricated by combining a facile hydrothermal and in situ solvothermal growth reaction. The structure and morphology of the pristine WO 3 and WO 3 /ZnWO 4 heterojunction arrays were characterized by XRD, FESEM, TEM and HRTEM while the chemical composition and surface properties were characterized by XPS. The 2D ZnWO 4 nanosheets were uniformly grown on the surface of the 1D WO 3 nanorods which resulted in a large active surface area. The charge carriers separation can be improved because of the energy band structure match between WO 3 and ZnWO 4 , which will more efficiently enhance the photoelectrochemical performance. The photocurrent densities of the WO 3 /ZnWO 4 heterojunction photoanode reached to 2.53 mA/cm 2 at 1.23 V versus RHE, nearly 1.6 times of the pristine WO 3 photoanode under visible light illumination. Graphic Abstract