纳米片
光催化
材料科学
双金属片
电子转移
纳米技术
吸附
化学工程
氢氧化物
催化作用
光化学
金属
化学
物理化学
有机化学
工程类
冶金
作者
Fengliang Wang,Ruiqi Fang,Xin Zhao,Xiangpeng Kong,Tingting Hou,Kui Shen,Yingwei Li
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-03-04
卷期号:16 (3): 4517-4527
被引量:48
标识
DOI:10.1021/acsnano.1c10958
摘要
Solar-driven conversion of CO2 is considered an efficient way to tackle the energy and environmental crisis. However, the photocatalytic performance is severely restricted due to the insufficient accessible active sites and inhibited electron transfer efficiency. This work demonstrates a general in situ topological transformation strategy for the integration of uniform Co-based species to fabricate a series of multishelled superstructures (MSSs) for CO2 photocatalytic conversion. Thorough characterizations reveal the obtained MSSs feature ultrathin Co-based nanosheet assembled polyhedral structures with tunable shell numbers, inner cavity sizes, and compositions. The superstructures increase the spatial density of Co-based active sites while maintaining their high accessibility. Further, the ultrathin nanosheets also facilitate the transfer of photogenerated electrons. As a result, the ZnCo bimetallic hydroxide featuring an ultrathin nanosheet assembled quadruple-shell hollow structure (ZnCo-OH QUNH) exhibits high photocatalytic efficiency toward CO2 reduction with a CO evolution rate of 134.2 μmol h-1 and an apparent quantum yield of 6.76% at 450 nm. The quasi in situ spectra and theoretical calculations disclose that Co sites in ZnCo-OH QUNH act as highly active centers to stabilize the COOH* intermediate, while Zn species play the role of adsorption sites for the [Ru(bpy)3]2+ molecules.
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