以曙红Y(EY)敏化Pt/TiO₂(EY-Pt/TiO₂)光催化产氢体系为模型, 研究了电子传递剂甲基紫精(MV²⁺)的加入对该体系产氢活性和稳定性的影响, 并通过紫外-可见光(UV-Vis)吸收光谱、荧光光谱和光电化学表征手段对MV²⁺的作用机制进行了研究. 结果表明, 当以三乙醇胺(TEOA)为电子给体时, MV²⁺可使EY激发态发生氧化性和还原性淬灭, 有效降低了不稳定中间体EY^3-•的形成和积累, 促进了电子由染料分子向产氢活性位点的有效传递, 从而提高了产氢体系的活性和稳定性. 两种敏化体系瞬态光电流以及产氢活性受EY浓度影响的差异进一步证明, MV²⁺作为电子传递剂有效提高了光生电子的传递和利用效率.

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 EY^3- center dot 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 MV²⁺ provided further evidence that MV²⁺ acted as an electron transfer agent to effectively improve photoinduced electron transfer and utilization efficiency.