Adjusting the Covalency of Metal-Oxygen Bonds in CuBiO by Zn Cation Doping to Achieve Highly Efficient Photocathodes.

Zn doped CuBiO photocathodes are prepared by using a low-cost solution-based spray pyrolysis method. The doping of Zn in CuBiO promotes the separation and migration of carriers and effectively increases the carrier density. Compared with CuBiO alone, the photoelectrochemical activity of the Zn doped CuBiO photoelectrode is improved with the photocurrent density of -0.