Efficient photocatalytic hydrogen evolution without an electron mediator using a simple electron donor-acceptor dyad

Hiroaki Kotani, Toshiya Ono, Kei Ohkubo, Shunichi Fukuzumi

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74 Scopus citations

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.

Original languageEnglish
Pages (from-to)1487-1492
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume9
Issue number12
DOIs
StatePublished - 2007

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