Details

Autor(en) / Beteiligte

• KOTANI, Hiroaki
• ONO, Toshiya
• OHKUBO, Kei
• FUKUZUMI, Shunichi

Titel

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

Ist Teil von

• Physical chemistry chemical physics : PCCP, 2007-01, Vol.9 (12), p.1487-1492

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2007

Quelle

MEDLINE

Beschreibungen/Notizen

• A highly efficient photocatalytic hydrogen evolution system without an electron mediator such as methyl viologen (MV(2+)) has been constructed using 9-mesityl-10-methylacridinium ion (Acr(+)-Mes), poly(N-vinyl-2-pyrrolidone)-protected platinum nanoclusters (Pt-PVP) and NADH (beta-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 MV(2+) 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.