TY - JOUR
T1 - H2 evolution from an aqueous methanol solution on SrTiO3 photocatalysts codoped with chromium and tantalum ions under visible light irradiation
AU - Ishii, Tatsuya
AU - Kato, Hideki
AU - Kudo, Akihiko
N1 - Funding Information:
The authors thank Prof. K. Domen (Chemical Resources Laboratory, Tokyo Institute Technology) for XPS measurement. This work was supported by the Core Research Evolutional Science and Technology (CREST) and a Grant Aid (No. 14050090) for the Priority Area Research (No. 417) from the Ministry of Education, Culture, Sports, Science and Technology, Japan. One of us (HK) has been awarded a Research Fellowship of the Japan Society of the Promotion of Scientists for Young Scientists.
PY - 2004/4/15
Y1 - 2004/4/15
N2 - SrTiO3 photocatalysts doped with chromium ions showed photocatalytic activities for H2 evolution from an aqueous methanol solution under visible light irradiation. However, it had a long induction period. Codoping of niobium or tantalum ions with chromium ions shortened the induction period, and increased the photocatalytic activities in respect of the H2 evolution. The photocatalytic activities of chromium- and chromium/tantalum-doped SrTiO3 were improved when they were pretreated at 773 K in the hydrogen reduction atmosphere. Codoping of tantalum ions suppressed the formation of Cr6+ ions and oxygen defects which would work as nonradiative recombination centers between photogenerated electrons and holes, resulting in the shortening of induction periods and the improvement of photocatalytic activities.
AB - SrTiO3 photocatalysts doped with chromium ions showed photocatalytic activities for H2 evolution from an aqueous methanol solution under visible light irradiation. However, it had a long induction period. Codoping of niobium or tantalum ions with chromium ions shortened the induction period, and increased the photocatalytic activities in respect of the H2 evolution. The photocatalytic activities of chromium- and chromium/tantalum-doped SrTiO3 were improved when they were pretreated at 773 K in the hydrogen reduction atmosphere. Codoping of tantalum ions suppressed the formation of Cr6+ ions and oxygen defects which would work as nonradiative recombination centers between photogenerated electrons and holes, resulting in the shortening of induction periods and the improvement of photocatalytic activities.
KW - Chromium doping
KW - Photocatalytic H evolution
KW - Visible light irradiation
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U2 - 10.1016/S1010-6030(03)00442-8
DO - 10.1016/S1010-6030(03)00442-8
M3 - Article
AN - SCOPUS:1342307415
SN - 1010-6030
VL - 163
SP - 181
EP - 186
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
IS - 1-2
ER -