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An effective preparation method of composite photocatalysts for hydrogen evolution using an organic photosensitizer and metal particles assembled on alumina-silica

Title
An effective preparation method of composite photocatalysts for hydrogen evolution using an organic photosensitizer and metal particles assembled on alumina-silica
Authors
Yamada Y.Tadokoro H.Fukuzumi S.
Ewha Authors
Shunichi Fukuzumi
SCOPUS Author ID
Shunichi Fukuzumiscopus
Issue Date
2016
Journal Title
Catalysis Today
ISSN
0920-5861JCR Link
Citation
vol. 278, pp. 303 - 311
Keywords
Hydrogen productionOrganic photosensitizerPhotocatalystPreparation method
Publisher
Elsevier B.V.
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Composite catalysts for photocatalytic hydrogen (H2) evolution were prepared by loading an organic electron donor–acceptor linked dyad [2-phenyl-4-(1-naphthyl)quinolinium ion, QuPh+–NA] as an organic photosensitizer and Pt or Cu particles as H2-evolution catalysts on alumina-silica. The composite catalysts loading Pt particles were prepared by two different methods; first, Pt particles were deposited by reduction of PtCl6 2− owing to photocatalysis of QuPh+–NA supported on alumina-silica (PD method), and second, alumina-silica was impregnated with the PtCl6 2− and calcined, and then QuPh+–NA was loaded on the Pt/alumina-silica by a cation exchange method (IMP method). When a composite catalyst was prepared by the IMP method, a high Pt-loading amount of 4.2 wt% was necessary to achieve the highest H2-evolution rate of 0.27 μmol h−1. On the other hand, a composite catalyst prepared by the PD method exhibited three times faster H2 evolution (0.83 μmol h−1) even though the loading amount of Pt was as low as 0.4 wt%. The activity of composite catalysts prepared by the PD method highly depends on the electric charges of precursors for Pt particles. A composite catalyst prepared with positively charged Pt(NH3)4 2+ as a precursor of Pt particles exhibited low catalytic activity with the H2-evolution rate of 0.10 μmol h−1, which is significantly lower than the rate (0.27 μmol h−1) for the composite catalyst prepared with PtCl6 2−. However, such precursor-dependence was not observed for composite catalysts employing Cu particles as an H2-evolution catalyst, because the Cu precursors are more labile than the Pt precursors in a reaction solution. The electrostatic interaction between the precursors of metal particles and negatively charged surfaces of alumina-silica should be taken into account to construct efficient H2-evolution catalysts. © 2016 Elsevier B.V.
DOI
10.1016/j.cattod.2016.01.018
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자연과학대학 > 화학·나노과학전공 > Journal papers
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