Electron Microscopy of Cocatalyst Nanostructures on Semiconductor Photocatalysts
Electron Microscopy of Cocatalyst Nanostructures on Semiconductor Photocatalysts
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DOI：
10.1002/cctc.201000443
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发表时间：
2011-06
期刊：
影响因子：
4.5
通讯作者：
N. Hondow;Y. Chou;K. Sader;R. Douthwaite;R. Brydson
中科院分区：
文献类型：
--
作者：
N. Hondow;Y. Chou;K. Sader;R. Douthwaite;R. Brydson
一个彻底的分析电子显微镜调查到已知的光催化材料NiTa 2 O 6和InTaO 4上的氧化镍助催化剂结构已经进行。这些光催化剂材料先前已在文献中报道在分解水以形成H2中具有活性，并且在添加助催化剂（例如NiO/Ni核壳纳米颗粒）的情况下，活性已被建议提高。虽然这种助催化剂的效果具有重要意义，但其结构以前没有详细研究过。通过使用高分辨率分析透射电子显微镜，已经确定该结构不像所建议的那样简单，并且尽管产生核壳金属/金属氧化物结构，但在两种情况下都没有获得完美的Ni/NiO组合物。特别地，在InTaO 4基材料的情况下，标称NiO/Ni助催化剂含有从光催化剂载体扩散到纳米颗粒中的铟。这一结果的潜在的光催化剂系统的设计的一般影响进行了讨论。
A thorough analytical electron microscopy investigation into the oxidized nickel cocatalyst structure on known photocatalytic materials NiTa2O6 and InTaO4 has been conducted. These photocatalyst materials have previously been reported in the literature to have activity in the splitting of water to form H2, and with the addition of a cocatalyst, such as NiO/Ni core shell nanoparticles, activity has been suggested to improve. Although important implications are placed on the effect of this cocatalyst, its structure has not previously been examined in detail. By using high resolution analytical transmission electron microscopy it has been determined that the structure is not as simple as suggested and, although a core shell metal/metal oxide structure is produced, in neither case is a perfect Ni/NiO composition obtained. In particular, in the case of the InTaO4 based material, the nominal NiO/Ni cocatalyst contains indium diffused into the nanoparticles from the photocatalyst support. The general implications of this result for the design of potential photocatalyst systems are discussed.