In situ UV-Vis spectroelectrochemical measurements were carried out with a Ocean Insight spectrophotometer using a three arm spectroelectrochemical cell under applied electrochemical potential. TiO2 modified ITO electrode was used as working electrode with Ag/Ag + as the reference electrode and Pt as the counter electrode. TiO2 catalyst was prepared into ITO electrode by using electrochemical deposition method, where the deposition voltage was below 60V.