Photocatalytic conversion of carbon dioxide (CO₂) to liquid product acetaldehyde (CH₃CHO) remains a great challenge due to the involvement of a complex 10-electron reduction process and a sluggish C–C coupling reaction. Herein, we report the synthesis of Janus silver/ternary silver halide (Ag/AgClBr) nanostructures through precisely manipulating the growth kinetics and its function as a plasmonic photocatalyst to boost the conversion of CO₂ to CH₃CHO. The obtained Janus nanostructures featuring both spatially separated architecture and broad light-harvesting capability facilitate the photocatalytic reduction of CO₂ under solar illumination. The photocatalytic CO₂ reduction with the characteristics of high activity and good selectivity can generate a 10-electron reduction product CH₃CHO with a generation rate of 209.3 ± 9.5 μmol h⁻¹ g⁻¹ and a selectivity of 96.9%, which are rarely achieved in previously reported photocatalytic CO₂ reduction systems. The excellent photocatalytic performance can be ascribed to the plasmonic effect of Ag nanocrystals and the favorable active sites on the catalyst surface. This research demonstrates for the first time the utilization of the Janus Ag/AgClBr nanostructures to generate the value-added C₂ liquid product through photocatalytic CO₂ reduction, paving the way for the design and construction of novel plasmonic photocatalysts.

中文翻译：

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Janus 银/三元卤化银纳米结构作为等离子体光催化剂促进 CO2 转化为乙醛

由于涉及复杂的 10 电子还原过程和缓慢的 C-C 偶联反应，将二氧化碳 (CO ₂ )光催化转化为液体产物乙醛 (CH ₃ CHO) 仍然是一个巨大的挑战。在此，我们报告了通过精确控制生长动力学及其作为等离子体光催化剂的功能来促进 CO ₂向 CH ₃ CHO转化的 Janus 银/三元卤化银 (Ag/AgClBr) 纳米结构的合成。获得的 Janus 纳米结构具有空间分离的结构和广泛的光收集能力，有助于在太阳光下光催化还原 CO ₂。光催化CO ₂具有高活性、选择性好的特点，可以生成10电子还原产物CH ₃ CHO，生成率为209.3 ± 9.5 μmol h ^-1 g ^-1，选择性为96.9%，这在以往报道中是很少见的光催化CO ₂还原系统。优异的光催化性能可归因于银纳米晶的等离子体效应和催化剂表面有利的活性位点。该研究首次证明了利用 Janus Ag/AgClBr 纳米结构通过光催化 CO ₂生成具有附加值的 C ₂液体产品 还原，为新型等离子体光催化剂的设计和构建铺平了道路。