Abstract
The effects and mechanism of methyl viologen (MV2+) on photocatalytic hydrogen production over an active, stable catalyst sensitized by Eosin Y (EY) under visible light were studied by UV-Vis absorption, fluorescence spectroscopies and photoelectric experiments. The results showed that MV2+ increased the efficiency of electron transfer from excited states of EY to the surface of Pt/TiO2 and suppressed accumulation of unstable intermediate EY3-by an oxidative and reductive quenching mechanism. MV2+ also improved the activity and stability of photocatalytic hydrogen production by an EY-sensitized Pt/TiO2 system with triethanolamine (TEOA) as an electron donor. The effects of transient photocurrent and concentration of EY on the hydrogen production activity of dye-sensitized systems with and without MV 2 + provided further evidence that MV2+ acted as an electron transfer agent to effectively improve photoinduced electron transfer and utilization efficiency.
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