v: The Role of Ion Migration and Alloy Formation on the Stability of Core Shell Cocatalysts for Photoinduced Water Splitting
v: The Role of Ion Migration and Alloy Formation on the Stability of Core Shell Cocatalysts for Photoinduced Water Splitting
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DOI：
10.1021/jp108974s
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发表时间：
2010-12
影响因子：
3.7
通讯作者：
N. Hondow;Y. Chou;K. Sader;R. Brydson;R. Douthwaite
中科院分区：
文献类型：
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作者：
N. Hondow;Y. Chou;K. Sader;R. Brydson;R. Douthwaite
半导体−金属纳米粒子复合材料可以催化水生成H2和O2的光诱导反应。采用高空间分辨率的显微分析方法，研究了半导体NiTa2O6和InTaO4表面负载的NiO/Ni核壳纳米粒子的结构和组成。对于NiTa2O6来说，金属纳米粒子为NiO/Ni核壳结构，光反应表明，在2.75和1.00μ−1h−1的条件下，在约1W/cm的−2下，水中可以生成H2和O2。反应后对复合材料的分析表明，NiO/Ni纳米粒子降解为Ni(OH)2。对于InTaO4，通过铟离子从InTaO4半导体向纳米粒子的扩散，对核壳纳米粒子进行了本体修饰，得到了新的核壳结构，其最佳配方为Ni1.25In0.75O3/Ni3In。尽管所有其他分析数据(PXRD、DRUVS、BET、SEM)与已报道的NiO/Ni：INTA的数据基本相同。
Semiconductor−metal nanoparticle composites can mediate the photoinduced reaction of water to H2 and O2. High spatial resolution microscopic analysis was used to investigate the structure and composition of nominally NiO/Ni core shell nanoparticles supported on the semiconductors NiTa2O6 and InTaO4, respectively. For NiTa2O6 the metal nanoparticles were confirmed as NiO/Ni core shell structures and photoreaction demonstrated that H2 and O2 were evolved from water at 2.75 and 1.00 μmol g−1 h−1, respectively, under ca. 1 W/cm−2 using an unfiltered 300W Xe lamp. Analysis of the composite after reaction showed evidence of degradation of the NiO/Ni nanoparticles to Ni(OH)2. For InTaO4 bulk modification of the core shell nanoparticles occurred via diffusion of indium ions from the InTaO4 semiconductor to the nanoparticles to give a new core shell structure best formulated as Ni1.25In0.75O3/Ni3In. Although all other analytical data (PXRD, DRUVS, BET, SEM) is essentially identical to that reported for NiO/Ni:InTa...