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Issue 12, 2007
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Efficient photocatalytic hydrogen evolution without an electron mediator using a simple electron donor–acceptor dyad

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Abstract

A highly efficient photocatalytic hydrogen evolution system without an electron mediator such as methyl viologen (MV2+) has been constructed using 9-mesityl-10-methylacridinium ion (Acr+–Mes), poly(N-vinyl-2-pyrrolidone)-protected platinum nanoclusters (Pt–PVP) and NADH (β-nicotinamide adenine dinucleotide, reduced form) as the photocatalyst, hydrogen evolution catalyst and electron donor, respectively. The photocatalyst (Acr+–Mes) undergoes photoinduced electron transfer (ET) from the Mes moiety to the singlet excited state of the Acr+ moiety to produce an extremely long-lived ET state, which is capable of oxidizing NADH and reducing Pt–PVP, leading to efficient hydrogen evolution. The hydrogen evolution efficiency is 300 times higher than that in the presence of MV2+ because of the much faster reduction rate of Pt–PVP by Acr˙–Mes compared with that by MV˙+. When the electron donor (NADH) is replaced by ethanol in the presence of an alcohol dehydrogenase (ADH), NADH is regenerated during the photocatalytic hydrogen evolution.

Graphical abstract: Efficient photocatalytic hydrogen evolution without an electron mediator using a simple electron donor–acceptor dyad

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Publication details

The article was received on 05 Sep 2006, accepted on 20 Oct 2006 and first published on 13 Nov 2006


Article type: Paper
DOI: 10.1039/B612794K
Citation: Phys. Chem. Chem. Phys., 2007,9, 1487-1492
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    Efficient photocatalytic hydrogen evolution without an electron mediator using a simple electron donor–acceptor dyad

    H. Kotani, T. Ono, K. Ohkubo and S. Fukuzumi, Phys. Chem. Chem. Phys., 2007, 9, 1487
    DOI: 10.1039/B612794K

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