Cooperation between inside and outside of TiO2: Lattice Cu+ accelerates carrier migration to the surface of metal copper for photocatalytic CO2 reduction
Cooperation between inside and outside of TiO2: Lattice Cu+ accelerates carrier migration to the surface of metal copper for photocatalytic CO2 reduction
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TiO2内外合作：晶格Cu加速载流子迁移至金属铜表面，实现光催化CO2还原
DOI：
10.1016/j.apcatb.2019.118515
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发表时间：
2020
影响因子：
22.1
通讯作者：
Li Hexing
中科院分区：
文献类型：
--
作者：
Zhu Sai;Chen Xiaofeng;Li Zhangcheng;Ye Xingyu;Liu Ying;Chen Yao;Yang Li;Chen Ming;Zhang Dieqing;Li Guisheng;Li Hexing
TiO2在CO2减排中得到了广泛的应用，但其载流子传输效率低的缺点阻碍了其实际应用。本文采用原位合成法制备了Cu/Cu+复合Ti3 +/TiO2（Cu/Cu +@TiO2）催化剂，并将其作为高选择性的光催化剂用于CO2的光催化还原。在TiO2晶格内部形成了丰富的Cu +-O价态，提高了载流子的传输效率，而在TiO2表面外部的金属铜则是催化还原CO2的活性中心。Cu/Cu +@TiO 2中外部Cu和内部Cu+之间的协同效应显著提高了电子载流子密度。更重要的是，Cu/Cu +@TiO 2中光生电子在表面羟基的辅助下可100%用于CO2还原，且未检测到H2释放。密度泛函理论计算也证实了Cu +-O桥的作用，具有更高的电荷密度在Cu网站的TiO 2的晶格。这项工作将提供新的见解，提高光催化效率的CO2还原传统的光催化剂，如TiO 2。
TiO2has been extensively used for CO2reduction while the low carrier transport efficiency still impedes its practical application. In the present work, Cu/Cu+fabricated Ti3+/TiO2(Cu/Cu+@TiO2) was prepared viain situionothermal method and acts as a highly selective catalyst for photocatalytic reduction of CO2. Abundant Cu+-O valences were formed inside the lattice of TiO2to enhance the carrier transport efficiency, and the metal copper outside on the surface are the active sites for CO2reduction. The synergistic effect between outside Cu and inside Cu+in Cu/Cu+@TiO2has dramatically increased the electron carrier density. More importantly, the photogenerated electrons in Cu/Cu+@TiO2can be 100 % utilized for CO2reduction aided by the hydroxyl group on the surface and no H2evolution was detected. Density functional theory calculations also confirm the role of Cu+-O bridge with a higher charge density at the Cu site in the lattice of TiO2. This work will provide new insights into increasing photocatalytic efficiency for CO2reduction by traditional photocatalyst like TiO2.