Abstract
Photoinduced electron transfer and hydrogen evolution were investigated using colloidal platinum stabilized by viologen-pendant Nylon (Pt—PV 2+). From laser flash photolysis experiments, the Pt—PV 2+ was found to accept directly an electron from excited ZnTMPyP 4+, and the reverse electron transfer was retarded by the positive charge of the protecting polymer, while no net electron transfer was observed for colloidal platinum stabilized by poly(vinyl alcohol) (Pt—PVA). The rate of hydrogen evolution was measured via steady-state irradiation experiments in the presence of a sacrificial electron donor. The quantum yield of hydrogen production with a Pt—PV 2+ catalyst was higher than that with Pt—PVA by a factor of 7 and reached 0.38.
Published Version
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