Method for preparing iron oxide photoanode under combined action of oxalic acid and tetrabutyl titanate

The invention relates to a method for preparing an iron oxide photoanode under the combined action of oxalic acid and tetrabutyl titanate. The method comprises the following steps: carrying out simpleelectrodeposition to obtain an an iron film, soaking the iron film in an oxalic acid (H2C2O4) ethanol solution while heating, carrying out ultrasonic soaking with tetrabutyl titanate (TBT), and carrying out annealing treatment to obtain the Fe2O3-H2C2O4+TBT photoanode. Due to oxalic acid and tetrabutyl titanate, the specific surface area of ferric oxide is increased, electron hole recombination is reduced, and the photoelectric property of ferric oxide is improved. Under AM1.5 standard test conditions, the photocurrent density can reach 0.59 mA cm at 1.23 V relative to a reversible hydrogen electrode. Different from a reported method, the method of the invention has the advantages that raw materials are cheap and easy to obtain, the whole photoelectrode preparation process is fast, andlarge-batch preparation is e