论文部分内容阅读
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EY3-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 photocatalytic hydrogen production system of EY-sensitized Pt / TiO2 (EY-Pt / TiO2) was used as a model to study the hydrogen production activity and stability of methyl viologen (MV2 +) And the mechanism of action on MV2 + by UV-Vis absorption spectroscopy, fluorescence spectroscopy and photoelectrochemical characterization was studied.The results show that when TEOA is used as electron donor, MV2 + The EY excited state oxidative and reductive quenching, effectively reducing the formation and accumulation of unstable intermediate EY3-, and promote the effective transfer of electrons from the dye molecules to active sites for hydrogen production, thereby increasing the hydrogen production system Activity and stability.The differences of transient photocurrent and hydrogen production activity by EY concentration of the two sensitization systems further prove that MV2 + can effectively improve the efficiency of photogenerated electron transfer and utilization as an electron transfer agent.