a) SEM image of the cross section of TiO2mesoporous film deposited on the FTO glass. The white arrow indicates the scan direction for the EDX measurements. b)EDX spectra of FTO/TiO2and FTO/TiO2/Pt with different electrodeposition time (30 s, 60 s, 90 s, 120 s). Distribution of components in the Pt/TiO2(180 s) obtained by theline-scan analysis of EDX: c) Ti map and d) Pt map, respectively.