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The photocatalytic water splitting into $H_2$ and $O_2$ mimicking a Z-scheme mechanism  

Jeon, Myung-Seok (Energy Conversion & Storage Research Center, Korea Institute of Energy Research)
Hong, Joon-Gi (Department of Chemical Engineering Chungnam National University)
Chun, Young-Gab (Energy Conversion & Storage Research Center, Korea Institute of Energy Research)
Choi, Ho-Suk (Department of Chemical Engineering Chungnam National University)
Publication Information
Journal of the Korean Solar Energy Society / v.23, no.4, 2003 , pp. 29-35 More about this Journal
Abstract
We studied the water splitting into $H_2$ and $O_2$ using two different semiconductor photo catalysts and redox mediator, mimicking the Z-scheme mechanism of the photosynthesis, $H_2$ evolution took place on a Pt-$SrTiO_2$ (Cr-Ta doped) photocatalyst using $I^-$ electron donor under the visible light irradiation. The Pt-$WO_3$ photocatalyst showed an excellent activity of the $O_2$ evolution using $IO_3^-$ electron acceptor under visible light. $H_2$ and $O_2$ gases evolved in the stoichiometric ratio($H_2/O_2$=2) under visible light using a mixture of the Pt-$WO_3$ and Pt-$SrTiO_3$ (Cr-Ta doped) suspended in NaI aqueous solution. We proposed a two-step photo-excitation mechanism using redox mediator under the visible irradiation.
Keywords
Photocatalyst; Water splitting; Redox mediator; Z-scheme;
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