A Core–Shell‐Structured Silver Nanowire/Nitrogen‐Doped Carbon Catalyst for Enhanced and Multifunctional Electrofixation of CO2,ChemSusChem

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A Core–Shell‐Structured Silver Nanowire/Nitrogen‐Doped Carbon Catalyst for Enhanced and Multifunctional Electrofixation of CO2
ChemSusChem ( IF 7.5 ) Pub Date : 2018-09-21 , DOI: 10.1002/cssc.201801612
Heng-Pan Yang ₁ , Han-Wen Zhang ₁ , Yu Wu ₁ , Liang-Dong Fan ₁ , Xiao-Yan Chai ₁ , Qian-Ling Zhang ₁ , Jian-Hong Liu ₁ , Chuan-Xin He ₁

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Numerous catalysts have been successfully introduced for CO₂ fixation in aqueous or organic systems. However, a single catalyst showing activity in both solvent types is still rare, to the best of our knowledge. We developed a core–shell‐structured AgNW/NC700 composite using a Ag nanowire (NW) core encapsulated by a N‐doped carbon (NC) shell at 700 °C. Through control experiments and density functional theory calculations, it was confirmed that Ag nanowires acted as the active sites for CO₂ fixation and the uniformly coating of N‐doped carbon created a CO₂‐rich environment around the Ag nanowires, which could significantly improve the catalytic activity of Ag nanowires for electrochemical CO₂ fixation. Under mild conditions, up to 96 % faradaic efficiency of CO, 95 % yield of Ibuprofen and 92 % yield of propylene carbonate could be obtained in the electrochemical CO₂ direct reduction, carboxylation and cycloaddition, respectively, using the same AgNWs/NC700 catalyst. These results might provide an alternative strategy for efficient electrochemical fixation of CO₂.

中文翻译：

核壳结构的银纳米线/氮掺杂碳催化剂，用于增强和多功能电固定CO2

已经成功地引入了许多催化剂，用于在水性或有机体系中固定CO ₂。然而，就我们所知，在两种溶剂类型中均显示出活性的单一催化剂仍然很少。我们开发了一种核-壳结构的AgNW / NC700复合材料，它使用被700℃的N掺杂碳（NC）壳包裹的Ag纳米线（NW）核。通过控制实验和密度泛函理论计算，证实了Ag纳米线充当了CO ₂固定的活性位点，并且均匀掺杂N掺杂的碳在Ag纳米线周围形成了富含CO _2的环境，这可以显着改善碳纳米管的结构。银纳米线对电化学CO _2的催化活性固定。在温和的条件下，使用相同的AgNWs / NC700催化剂，在电化学CO ₂直接还原，羧化和环加成反应中，分别可分别获得高达96％的法拉第效率，布洛芬的95％的收率和碳酸亚丙酯的92％的收率。这些结果可能为有效的电化学固定CO ₂提供了另一种策略。

更新日期：2018-09-21

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