Efficient H2O2Production via H2O Oxidation on an Anode Modified with Sb-Containing Mixed Metal Oxides

The effect of the surface modification of a fluorine-doped tin oxide (FTO) electrode with an Sb-containing mixed metal oxide on the oxidative production of H(2)O(2)from H2O was investigated. The initial faradaic efficiency for H(2)O(2)production (FE(H2O2)) reached 98 % when CuSb2Ox/FTO was used as the anode, as a consequence of the suppression of O(2)generationviafour-electron oxidation of H2O. InSbO(x)modification of FTO resulted in a suppression of the oxidative decomposition of H(2)O(2)to O-2. The double-layer composite electrode InSbOx/CuSb2Ox/FTO indicated the advantageous traits of both Sb-containing mixed metal oxides, and this composite electrode showed superior FE(H2O2), current-potential dependence, and stability to other electrodes such as CuSb2Ox/FTO, InSbOx/FTO, and Al2O3/BiVO4/FTO.