THE ROLE OF TRAP-CENTERS ON SRTIO3 FINE PARTICLES DURING WATER PHOTOLYSIS

被引：3
作者：
KUTTY, TRN
AVUDAITHAI, M
机构：
[1] Department of Inorganic, Physical Chemistry Indian Institute of Science Bangalore
来源：
MATERIALS RESEARCH BULLETIN | 1990年 / 25卷 / 06期
关键词：
D O I：
10.1016/0025-5408(90)90212-K
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
SrTiO3 fine powders prepared by different routes vary considerably by way of type and concentration of defect centres, as revealed by EPR investigations. The predominant electron-centres are Ti3+-VO and V1Sr, whereas the hole-centres correspond to O- adjacent to strontium vacancies. SrTiO3 particles suspended in dilute acids under low intensity illumination show the presence of OH.s radicals. During water photolysis under band gap irradiation, the hole-centres on SrTiO3 participate in the charge transfer to OH- or other hole-scavenging species such as EDTA, H2PO2- or TEOA. Details of H2 evolution kinetics of sacrificial photolysis system involving H2PO2- and Pt SrTiO3 are given. Reactivity of hole-centres on SrTiO3 is higher than those on TiO2, which accounts for O2 evolution in photocatalyzed water-splitting in the case of SrTiO3. © 1990.
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页码：821 / 828
页数：8
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