Electrochemical H 2 O 2 Production and Accumulation from H 2 O by Composite Effect of Al 2 O 3 and BiVO 4

Abstract

The modification effects of both BiVO4 and Al2O3 on a FTO on efficient oxidative H2O2 production and accumulation from H2O were investigated. The initial faradaic efficiency for H2O2 production (FE (H2O2)) reached 95% due to the suppressing influence of direct O2 production via H2O oxidation on BiVO4/FTO. Al2O3 modification suppressed oxidative H2O2 decomposition to O2, which was confirmed by changes in the I-V curves after H2O2 addition. The initial FE (H2O2) of Al2O3/BiVO4/FTO modified by chemical vapor deposition (CVD) reached 97%. Oxidative H2O2 decomposition was significantly suppressed by the loaded Al2O3, and the amount of accumulated H2O2 on this composite electrode was reached 7.5 mM at 200 C, which is the highest value in the system for oxidative H2O2 production from H2O.