Photocatalyst arrays of a number of metal oxides were prepared by dispensing metal precursor solutions onto fluorine-doped tin oxide-coated glass followed by annealing at 500 °C for 3 h. These were screened by scanning electrochemical microscopy with a scanning optical fiber, and the results showed that all Sn-doped Cd−In−Bi, Zn−In, and W−Cd oxide photocatalysts produced enhanced photocurrents for specific metal ratios. The products of the photoelectrochemical (PEC) reaction could be detected electrochemically by a Au ring on the optical fiber. The PEC properties of larger electrodes were investigated, and the Zn−In and W−Cd oxide photocatalysts showed a much higher photoactivity than Sn-doped Cd−In−Bi. Even without catalysts, they showed visible light response for water oxidation to oxygen.
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Liu et al. (2009) studied this question.
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