Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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The photocatalytic water splitting into $H_2$ and $O_2$ mimicking a Z-scheme mechanism

광합성을 모사한 광촉매 물분해 수소 제조

  • 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)
  • Published : 2003.12.30
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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.

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