| 基于曙红Y氧化性猝灭的高活性和高稳定的可见光催化产氢催化剂 |
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| 引用本文： | 李波,吕功煊.基于曙红Y氧化性猝灭的高活性和高稳定的可见光催化产氢催化剂[J].物理化学学报,2013,29(8):1778-1784. |
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| 作者姓名： | 李波 吕功煊 |
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| 作者单位： | 1.Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Zhong Road 18, Lanzhou 730000, P. R. China;2.University of Chinese Academy of Sciences, Beijing 100049, P. R. China |
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| 基金项目： | The project was supported by the National Natural Science Foundation of China，National Key Basic Research Program of China (973)，National High Technology Research and Development Program of China (863)，国家自然科学基金，国家重点基础研究发展规划项目(973)，国家高技术研究发展计划项目(863) |
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| 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.
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| 关 键 词： | 甲基紫精 活性 稳定性 产氢 光催化 |
| 收稿时间： | 2013-04-16 |
| 修稿时间： | 2013-05-30 |
Highly Active and Stable Catalyst for Visible Light Hydrogen Production Based on Oxidative Quenching of Eosin Y |
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| LI Bo
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L Gong-Xuan.Highly Active and Stable Catalyst for Visible Light Hydrogen Production Based on Oxidative Quenching of Eosin Y[J].Acta Physico-Chimica Sinica,2013,29(8):1778-1784. |
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| Authors: | LI Bo L Gong-Xuan |
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| Institution: | 1.Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Zhong Road 18, Lanzhou 730000, P. R. China;2.University of Chinese Academy of Sciences, Beijing 100049, P. R. China |
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| 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 MV2+ provided further evidence that MV2+ acted as an electron transfer agent to effectively improve photoinduced electron transfer and utilization efficiency. |
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| Keywords: | Methyl violet Activity Stability Hydrogen production Photocatalysis |
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