Abstract
In the present study, photo-electrochemical and hydrogen evolution characteristics of a new type of TiO 2(ns) and TiO 2(ns)–In 2O 3/Ti septum based semiconductor-septum photo-electrochemical (SC-SEP, PEC) solar cell has been studied. The SC-SEP cell in the configuration of SCE/1 M NaOH/TiO 2(ns)/Ti/H 2SO 4+K 2SO 4/Pt CE, Pt WE showed the photo-voltage and photo-current of 0.72 V and 8.6 mA/cm 2, whereas the SC-SEP cell employing In 2O 3 admixed TiO 2(ns) photo-electrode and having the configuration: SCE/1 M NaOH/TiO 2(ns)–In 2O 3/Ti/H 2SO 4+K 2SO 4/Pt CE, Pt WE, showed the photo-voltage and photo-current of 0.92 V and 14.6 mA/cm 2, respectively. The hydrogen gas evolution for the SC-SEP cell based on TiO 2(ns)/Ti photo-electrode was found to be 8.2 l/h m 2, on the other hand the In 2O 3 modified TiO 2(ns) exhibited a higher hydrogen gas evolution rate of 11.8 l/h m 2. Evidence and arguments have been put forward to show that the presence of In 2O 3 over TiO 2 makes the system posses the advantages of a colloidal photochemical system. The better performance of the new photo-electrode is thought to be due to improved spectral response and catalytic activity of In 2O 3 in regard to the hydrogen gas evolution kinetics.
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