材料科学
光电效应
光催化
金属
X射线光电子能谱
吸附
面(心理学)
选择性
光化学
结晶学
催化作用
物理化学
化学工程
光电子学
化学
生物化学
社会心理学
五大性格特征
工程类
人格
冶金
心理学
作者
Lei Lü,Xingye Zhu,Shaomang Wang,Taozhu Li,Shicheng Yan,Zhigang Zou
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2021-12-13
卷期号:33 (10): 100401-100401
被引量:4
标识
DOI:10.1088/1361-6528/ac353e
摘要
In this article, the roles of surface-active sites in dominating photoelectron selectivity for CO2reduction products are well demonstrated over photocatalyst models of SrTiO3{100} and {110} facets. On the easily exposed {100} facets terminated with Sr-O atoms, photoelectrons are of 8 mol % for CH4and 92 mol % for CO generation. The Sr-O-Ti configuration in the {110} facets could enrich the surface charge density due to the lower interface resistance for higher photocatalytic efficiency (1.6 fold). The dual sites of Ti and adjacent Sr atoms are active for strong adsorption and activation of the generated CO* species from primary CO2reduction on the surface, thus kinetically favoring the activity of photoelectrons (73 mol %) in hydrogenation for CH2* species and hence CH4product. Inversely, the poor CH4selectivity is due to difficulty in the subsequent photoelectron reduction reaction by the weak adsorption of CO* at the single-Sr site on the {100} facets, independent of the electron and proton concentration. Our results may offer some illuminating insights into the design of a highly efficient photocatalyst for selective CO2reduction.
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