Au@TiO2 Core-Shell Composites for the Photocatalytic Reduction of CO2.
Au@TiO2 Core-Shell Composites for the Photocatalytic Reduction of CO2.
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DOI：
10.1002/chem.201801796
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Anna Pougin;G. Dodekatos;Martin Dilla;H. Tüysüz;J. Strunk
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文献类型：
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作者：
Anna Pougin;G. Dodekatos;Martin Dilla;H. Tüysüz;J. Strunk
设计了不同几何排列的Au/TiO 2催化剂，考察了催化剂的形貌和结构对气相H2 O光催化还原CO2反应的影响.活性最高的样品是Au @ TiO 2核-壳催化剂，其具有沉积在TiO 2壳的外表面上的另外的Au纳米颗粒（NP）。CH 4和CO是主要的含碳产物。大量的H2是通过光催化分解H2 O而另外形成的。壳厚度起着关键作用。观察到最高的产率与最厚的层的TiO 2，强调的重要性的半导体的反应。商业TiO 2与和没有Au NPs是在生产中的CH 4和CO的活性较低。CO2的增强的活化的核-壳系统的结论是从金核，二氧化钛壳，和Au NPs的外表面之间的电子相互作用。Au-TiO 2界面的改善暴露有助于有益效果。
Au/TiO2 catalysts in different geometrical arrangements were designed to explore the role of morphology and structural properties for the photocatalytic reduction of CO2 with H2 O in the gas-phase. The most active sample was a Au@TiO2 core-shell catalyst with additional Au nanoparticles (NPs) deposited on the outer surface of the TiO2 shell. CH4 and CO are the primary carbon-containing products. Large amounts of H2 are additionally formed by photocatalytic H2 O splitting. Shell thickness plays a critical role. The highest yields were observed with the thickest layer of TiO2 , stressing the importance of the semiconductor for the reaction. Commercial TiO2 with and without Au NPs was less active in the production of CH4 and CO. The enhanced activation of CO2 on the core-shell system is concluded to result from electronic interaction between the gold core, the titania shell, and the Au NPs on the outer surface. The improved exposure of Au-TiO2 interface contributes to the beneficial effect.