Alkaline Co(OH)2-Decorated 2D Monolayer Titanic Acid Nanosheets for Enhanced Photocatalytic Syngas Production from CO2
Alkaline Co(OH)2-Decorated 2D Monolayer Titanic Acid Nanosheets for Enhanced Photocatalytic Syngas Production from CO2
复制标题
碱性 Co(OH)2 修饰的二维单层钛酸纳米片用于增强 CO2 光催化合成气生产
DOI：
10.1021/acsami.1c08251
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发表时间：
2021-08-03
影响因子：
9.5
通讯作者：
Liang, Shijing
中科院分区：
文献类型：
--
作者：
Liao, Wanru;Chen, Weihang;Liang, Shijing
The difficulty of adsorption and activation of CO2 at the catalytic site and rapid recombination of photogenerated charge carriers severely restrict the CO2 conversion efficiency. Here, we fabricate a novel alkaline Co(OH)(2)-decorated ultrathin 2D titanic acid nanosheet (H2Ti6O13) catalyst, which rationally couples the structural and functional merits of ultrathin 2D supports with catalytically active Co species. Alkaline Co(OH)(2) beneficially binds and activates CO2 molecules, while monolayer H2Ti6O13 acts as an electron relay that bridges a photosensitizer with Co(OH)(2) catalytic sites. As such, photoexcited charges can be efficiently channeled from light absorbers to activated CO2 molecules through the ultrathin hybrid Co(OH)(2)/H2Ti6O13 composite, thereby producing syngas (CO/H(2)mixture) from photoreduction of CO2. High evolution rates of 56.5 mu mol h(-1) for CO and 59.3 mu mol h(-1) for H-2 are achieved over optimal Co(OH)(2)/H2Ti6O13 by visible light illumination. In addition, the CO/H-2 ratio can be facilely tuned from 1:1 to 1:2.4 by changing the Co(OH)(2) content, thus presenting a feasible approach to controllably synthesize different H-2/CO mixtures for target applications.
