摘要
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 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 MV2＋ provided further evidence that MV2＋ acted as an electron transfer agent to effectively improve photoinduced electron transfer and utilization efficiency.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2013年第8期1778-1784,共7页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(21173242)
国家重点基础研究发展规划项目(973)(2009CB22003)
国家高技术研究发展计划项目(863)(2012AA051501)资助~~
关键词
甲基紫精
活性
稳定性
产氢
光催化
Methyl violet
Activity
Stability
Hydrogen production
Photocatalysis
