Porous TiO2 Nanotubes with Spatially Separated Platinum and CoOx Cocatalysts Produced by Atomic Layer Deposition for Photocatalytic Hydrogen Production
Porous TiO2 Nanotubes with Spatially Separated Platinum and CoOx Cocatalysts Produced by Atomic Layer Deposition for Photocatalytic Hydrogen Production
复制标题
多孔 TiO2 纳米管与空间分离的铂和 CoOx 助催化剂通过原子层沉积生产用于光催化制氢。
DOI：
10.1002/anie.201611137
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发表时间：
2017
影响因子：
16.6
通讯作者：
Qin Yong
中科院分区：
文献类型：
--
作者：
Zhang Jiankang;Yu Zhuobin;Gao Zhe;Ge Huibin;Zhao Shichao;Chen Chaoqiu;Chen Shuai;Tong Xili;Wang Meihua;Zheng Zhanfeng;Qin Yong
光生电子和空穴的有效分离以及相关的表面反应是用于光催化制氢的有效半导体光催化系统的关键方面。采用模板辅助原子层沉积法制备了一种新型CoOx /TiO 2/Pt光催化剂，并将其用于Pt和CoOx双助催化剂上的光催化制氢。Pt纳米团簇作为电子收集器和还原反应的活性位点沉积在多孔TiO 2纳米管的内表面上，而CoOx纳米团簇作为空穴收集器和氧化反应的活性位点沉积在多孔TiO 2纳米管的外表面上。一种CoOx /TiO 2/Pt光催化剂，包括超低浓度的贵金属Pt（0.046wt%）和CoOx（0.019wt%）同时沉积一个原子层沉积周期，实现了显着高的光催化效率（275.9 μmol h-1），这是近五倍的原始TiO 2纳米管（56.5 μmol h-1）。 高分散的Pt和CoOx纳米团簇、大比表面积的TiO 2纳米管的多孔结构以及空间分离的Pt和CoOx双助催化剂的协同作用有助于优异的光催化活性。
Efficient separation of photogenerated electrons and holes, and associated surface reactions, is a crucial aspect of efficient semiconductor photocatalytic systems employed for photocatalytic hydrogen production. A new CoOx /TiO2 /Pt photocatalyst produced by template-assisted atomic layer deposition is reported for photocatalytic hydrogen production on Pt and CoOx dual cocatalysts. Pt nanoclusters acting as electron collectors and active sites for the reduction reaction are deposited on the inner surface of porous TiO2 nanotubes, while CoOx nanoclusters acting as hole collectors and active sites for oxidation reaction are deposited on the outer surface of porous TiO2 nanotubes. A CoOx /TiO2 /Pt photocatalyst, comprising ultra-low concentrations of noble Pt (0.046 wt %) and CoOx (0.019 wt %) deposited simultaneously with one atomic layer deposition cycle, achieves remarkably high photocatalytic efficiency (275.9 μmol h-1 ), which is nearly five times as high as that of pristine TiO2 nanotubes (56.5 μmol h-1 ). The highly dispersed Pt and CoOx nanoclusters, porous structure of TiO2 nanotubes with large specific surface area, and the synergetic effect of the spatially separated Pt and CoOx dual cocatalysts contribute to the excellent photocatalytic activity.