(Invited) Photoelectrochemical Syntheses of H_2O_2 Via O_2 Reduction Using p-Type CuBi_2O_4 or Cu_3VS_4 Electrode Under Visible Light

摘要

Hydrogen peroxide (H_2O_2) is a promising solar fuel with advantages of easy storage and high energy density. Here, we report in situ photoelectrochemical synthesis of H_2O_2 via O_2 reduction reaction (ORR) using a p-type CuBi_2O_4 (CBO) electrode at an applied voltage far lower than the theoretical electrolysis voltage under visible light irradiation. Although a CBO electrode has a major limitation for PEC devices due to redox instability in aqueous solution, it exhibits an unexpected, surprisingly high H_2O_2 activity in the presence of O_2 without having a deleterious impact on the durability of the electrode. We also reported about the fabrication of a new p-type Cu_3VS_4 electrode for H_2O_2 production under visible light irradiation.