2013-Small 最新光催化文章：高效的CdS光分水制氢文章-超快电子分离？半导体TiO2及过渡 金属氧化物 、层状金属化合物，以及能利用可见光的催化材料，如CdS、Cu-ZnS等，都能在一定的光照条件下，催化分解水，从而产生氢气。然而到目前为止，利用 催化剂 光解水的效率还很低，只有1% ～2%。??该文章通过水热合成法制备单分散的钛酸盐的三维纳米微球，具有不团聚的结构。然后应用离子交换机制在钛酸盐微米球上原位生长出CdS的量子点（5nm），然后这种纳米复合结构具有高效的电子-空穴分离效率，超快瞬态光电子光谱证明光生电子的转移时间约为～ 3.2 × 10 ? 10 s，大大提高了光催化产氢气的效率。Here, we focus on engineering nanoarchitectures that facilitates an effective distribution of the two active components (CdS and titanate materials) into a highly efficient artifi cial photosynthetic system. This is achieved by creating numerous nano-junctions and confi ning the active constituents into a hierarchical porous structure. We report on a simple technique based on a combination of hydrothermal treatment, ion exchange and gas reaction processes to synthesize three-dimensional (3D) CdS-titanate composite nanomaterials, in which the CdS nanoparticles are spatially distributed and fi xed on the surface of 3D titanate structures. As a consequence of the effi cient vectorial electron transfer driven by the excitation of CdS under visible-light, this composite system exhibits an enhanced visible-light-driven hydrogen evolution - far exceeding those comprising of single components or blends obtained by simply mixing CdS and titanate materials.mcontent.jpg2.jpg未命名.jpg全文链接：http://onlinelibrary.wiley.com/d ... .201202156/abstract[查看更多3个回答 . 19人已关注
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