광합성을 모사한 광촉매 물분해 수소 제조
The photocatalytic water splitting into H2 and O2 mimicking a Z-scheme mechanism
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Abstract
We studied the water splitting into H2 and O2 using two different semiconductor photocatalysts and redox mediator , mimicking the Z-scheme mechanism of the photosynthesis. H2 evolution took place on a Pt-SrTiO3 (Cr-Ta doped) photocatalyst using I- electron donor under the visible light irradiation. The Pt-WO3 photocatalyst showed an excellent activity of the O2 evolution using IO3- electron acceptor under visible light. H2 and O2 gases evolved in the stoichiometric ratio(H2/O2=2) under visible light using a mixture of the Pt-WO3 and Pt-SrTiO3 (Cr-Ta doped) suspended in NaI aqueous solution. We proposed a two-step photo-excitation mechanism using redox mediator under the visible irradiation.