Investigation of Photocatalytic Activity with a Metal Doped TiO 2 Nanotubular Electrode for Hydrogen Production

Abstract

ABSTRACT The purpose of this study was to correlate between photoelectrochemcial hydrogen production rate and electron transfer with various types of metal doped TiO 2 nanotubes as photoanodes. In order to fabricate light sensitized photoanode, CdS, WO 3 , and Pt were doped by electrodeposition method. As the results of experiments, the electron transfer was favorable from higher position to lower position of conduction band (CB). In consequence, the higher hydrogen production rate was as follows, CdS/TiO 2 (100 umol/hr-cm 2 ) > WO 3 /TiO 2 (20 umol/hr-cm 2 ) > Pt/TiO 2 (10 umol/hr-cm 2 ). The surface characterizations exhibited that crystal structure, morphological and electrical properties of various metal depoed TiO 2 nanotubes by the results of SEM, TEM, XPS, and photocurrent measurements.KEY WORDS : Anodization(양극산화), Conduction band(전도대), Photoanode(광어노드), CdS(황화카드뮴), WO 3 (삼산화텅스텐), Hydrogen(수소) 한국수소 및 신에너지학회 논문집(2011. 10), 제22권 제5호Trans. of the Korean Hydrogen and New Energy Society(2011. 10), Vol. 22, No. 5, pp. 656~662