Synergistic Effect of CdSe Quantum Dot Sensitization and Nitrogen Doping of TiO2 Nanostructures for Photoelectrochemical Solar Hydrogen Generation
Synergistic Effect of CdSe Quantum Dot Sensitization and Nitrogen Doping of TiO2 Nanostructures for Photoelectrochemical Solar Hydrogen Generation
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DOI：
10.1021/nl903217w
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发表时间：
2010-02-01
期刊：
影响因子：
10.8
通讯作者：
Zhang, Jin Z.
中科院分区：
文献类型：
--
作者：
Hensel, Jennifer;Wang, Gongming;Zhang, Jin Z.
本文报道了同时掺杂氮和CdSe量子点敏化的TiO2纳米粒子和纳米线的合成和光电化学（PEC）研究。这些新型纳米复合结构已成功应用于以Na2S和Na2SO3为牺牲试剂的PEC制氢光阳极。我们观察到与n掺杂TiO2或CdSe QD敏化TiO2相比，这些纳米复合材料的光响应显著增强。这种增强是由于CdSe敏化和n掺杂的协同作用，促进了CdSe通过n掺杂介导的氧空位态（V-0）从CdSe到TiO2的空穴转移/输运。研究结果表明，设计和控制复合纳米材料的能带排列对于从根本上改善电荷分离和输运，从而改善PEC性能的重要性。
We report the synthesis and photoelectrochemical (PEC) studies of TiO2 nanoparticles and nanowires simultaneously doped with nitrogen and sensitized with CdSe quantum dots (QDs). These novel nanocomposite structures have been applied successfully as photoanodes for PEC hydrogen generation using Na2S and Na2SO3 as sacrificial reagents. We observe significant enhanced photoresponse in these nanocomposites compared to N-doped TiO2 or CdSe QD sensitized TiO2. The enhancement is attributed to the synergistic effect of CdSe sensitization and N-doping that facilitate hole transfer/transport from CdSe to TiO2 through oxygen vacancy states (V-0) mediated by N-doping. The results demonstrate the importance of designing and manipulating the energy band alignment in composite nanomaterials for fundamentally improving charge separation and transport and thereby PEC properties.