Selective and Efficient SnMOF@BiVO₄ Photoanode for Two-Electron Water Oxidation to Hydrogen Peroxide Production

Photoelectrochemical water oxidation may provide one of the solutions to hydrogen peroxide production, but the selectivity and efficiency of the two-electron process still need to be improved. Precise control of the composition and structure of the photoanode materials is essential. Herein, a SnMOF@BiVO4 photoanode was fabricated for two-electron water oxidation to H2O2 production. The PEC production rate of H2O2 at 1.5 VRHE reached 0.62 μmol/min·cm2 and the Faradaic efficiency (FE) reached 82.0%. Meanwhile, the photocurrent density of SnMOF@BiVO4 was 2.5 times higher than that of pristine BiVO4, which was attributed to the enhanced two-electron oxidation selectivity and the accelerated charge transfer ability. This work provides a universal strategy for the fabrication of photoanode materials applied for PEC water oxidation to synthesize H2O2.