Mo-doped BiVO 4 nanocrystals with low bandgap energy were embedded into the surface of WO 3 film, resulting in WO 3/BiV 0.95Mo 0.05O 4 photoanodes, which were tested in photoelectrochemical cells for water splitting. Bilayer photoelectrochemical cells showed enhanced photocurrent density: three times that shown by a cell with a pure WO 3 photoanode and 1.5 times that of a cell with a WO 3/BiVO 4 bilayer photoanode. BiVO 4 showed poor charge carrier mobility; the performance of photoelectrochemical cells can be improved only when BiVO 4 is combined with a WO 3 bottom layer, even after Mo doping and tailoring its transition energies by atomic doping.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry