Sunlight-assisted film photoelectrode material based on single electrode and double functions and iron-air battery

The invention relates to the technical field of metal-air batteries, in particular to a sunlight-assisted film photoelectrode material based on single-electrode double functions and an iron-air battery. The preparation method of the film photoelectrode material comprises the following steps: firstly preparing a BiVO4 photoelectrode material by using electrodeposition and calcination methods, depositing a Cu2O film by using an electrodeposition method on the basis of BiVO4, and oxidizing Cu2O into CuO by using a calcination method to obtain the BiVO4-CuO film photoelectrode material. The iron-air battery is obtained by assembling a KOH solution serving as an electrolyte, an iron sheet serving as a metal electrode and a BiVO4-CuO film photoelectrode material serving as an air electrode in a container. The material with excellent photocatalytic activity is prepared, light is introduced into the iron-air battery, the charging voltage is reduced under the illumination condition, and the discharging voltage is incr