吕功煊.不同染料共敏化TiO2可见光分解水产氢性能研究[J].分子催化编辑部,2013,(2):181-191
不同染料共敏化TiO2可见光分解水产氢性能研究
Cosensitized TiO2 with Different Dyes for Water Splitting to Hydrogen under Visible Light
投稿时间:2013-03-05  修订日期:2013-03-21
DOI:
中文关键词:  光催化  共敏化  FRET  曙红Y  玫瑰红  制氢
英文关键词:Photocatalysis  Cosensitization  FRET  Eosin Y  Rose Bengal  Hydrogen production
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作者单位E-mail
吕功煊 兰州化物所 gxlu@lzb.ac.cn 
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中文摘要:
      本文以光催化还原水制氢为指标反应系统考察了若干种染料对TiO2的 共敏化作用, 研究结果表明曙红Y(Eosin Y, EY)和玫瑰红(Rose Bengal, RB)对TiO2的共敏化效果最为显著, 而钌染料(Ru(bipy)3Cl2, Ru)分别与EY和RB的共敏化效果则不显著或没有共敏化效应. UV-Vis吸收光谱和荧光光谱技术对染料共敏化体系的表征结果表明, 在EY/RB体系中显著的共敏化效应不仅与染料对可见光的吸收增加有关, 而且还与染料分子之间的荧光共振能量转移(FRET)有关, 这种荧光共振能量转移可有效降低染料激发态由于荧光猝灭导致的能量损失, 提高光催化产氢效率. 瞬态光电流实验和单色光产氢实验结果也进一步确证了这种作用. 本文的结果还表明, 在Ru/EY和Ru/RB体系中, 必须加入甲基紫精作为电子中继试剂才能使催化剂具有光催化活性. 在优化的反应条件下(λ≥420 nm), EY/RB共敏化体系的产氢量子效率分别比EY和RB单一染料敏化体系提高了36.3%和215.4%.
英文摘要:
      In this paper, the cosensitized effects of TiO2 by various dyes were investigated using photocatalytic water reduction for hydrogen production as a model reaction. The results showed that there was a profound cosensitized effect when Eosin Y (EY) and Rose Bengal (RB) were used as cosensitizer, while the combination of Ru(bipy)3Cl2 either with EY or RB did not show any cosensitized effects for hydrogen production. For EY/RB cosensitized systems, the UV–vis absorption spectra and fluorescence spectrum revealed that the remarkable cosensitization effect in EY/RB systems originated from not only the enhanced light absorption efficiency, but also the effective F鰎ster resonant energy transfer (FRET) between two dyes, which could effectively reduce the energy loss due to the fluorescence quenching of excited state dyes, in turn enhance the photocatalytic efficiency of hydrogen production. This conclusion was confirmed by the transient photocurrent and monochromic light experiments. Our results also showed that the Ru/EY and Ru/RB cosensitized systems only exhibited photoreactivity for hydrogen production in the presence of methyl viologen (MV2 ) as electron transfer relay. Under optimal conditions (λ≥420 nm), the apparent quantum yield (AQY) of hydrogen production for EY/RB cosensitized systems was 36.3% and 215.4% higher than single EY and RB sensitized systems, respectively.
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