In situ synthesis of ordered mesoporous Co-doped TiO2 and its enhanced photocatalytic activity and selectivity for the reduction of CO2
In situ synthesis of ordered mesoporous Co-doped TiO2 and its enhanced photocatalytic activity and selectivity for the reduction of CO2
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DOI：
10.1039/c4ta05892e
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发表时间：
2015-04
影响因子：
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通讯作者：
Tao Wang;Xianguang Meng;Guigao Liu;Kun Chang;Peng Li;Qing Kang;Lequan Liu;Mu Li;S. Ouyang-
中科院分区：
文献类型：
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作者：
Tao Wang;Xianguang Meng;Guigao Liu;Kun Chang;Peng Li;Qing Kang;Lequan Liu;Mu Li;S. Ouyang-
采用多组分自组装法合成了有序介孔钴掺杂二氧化钛。Co的掺杂改变了TiO 2的导带和价带的结构，导致TiO 2的可见光吸收。所设计的钴掺杂二氧化钛在通常报道的光催化剂中表现出更高的可见光还原CO2的活性。此外，通过改变Co/Ti的摩尔比，优化了Co掺杂TiO 2的能带结构，提高了还原产物的选择性。当Co物种的掺杂量增加到一定程度时，可得到具有氧空位的Co 3 O 4/Co掺杂TiO 2纳米复合材料，明显提高了CH 4的生成速率。
Ordered mesoporous cobalt-doped titanium dioxide was successfully synthesized by a multicomponent self-assembly process. The doped Co species change the construction of the conduction band and valence band of TiO2, leading to visible-light absorption for TiO2. The designed cobalt-doped titanium dioxide exhibits a higher visible light activity for the reduction of CO2 among the commonly reported photocatalysts. In addition, the selectivity of the reduction products is improved by optimizing the energy-band configurations of cobalt-doped titanium dioxide through varying the molar ratio of Co/Ti. When the doping content of cobalt species increases to some extent, Co3O4/Co-doped TiO2 nanocomposites with oxygen vacancies were obtained, which markedly improve the generation rate of CH4.