Electrochemical CO₂ reduction to carbon monoxide (CO) is immensely important for sustainable CO₂ recycling. In this study, we established a facile synthetic method for large-scale production of Ag nanoparticles, which can be used for the selective electrochemical reduction of CO₂ to CO. Thermal decomposition and reduction of AgNO₃ produced Ag nanoparticles on a gram-scale in high yield (over 90%) with a homogeneous size distribution. The oleylamine-capped Ag nanoparticles were quasi-spherical with diameters of 9 ± 2 nm. Ag nanoparticles are capable of electrochemical CO₂ reduction to CO with high activity and stability. The CO selectivity of the catalyst was in the vicinity of 90% over a wide potential range and reached 94.2% at −1.4 V vs. RHE. The Ag nanoparticles showed good stability over 24 h. Different surface functional groups, for example, thiol and citrate were investigated to understand their influence on the variation in CO selectivity.

中文翻译：

---

用于选择性电化学 CO2 还原反应的 Ag 纳米粒子的简便和大规模生产

电化学 CO ₂还原为一氧化碳 (CO) 对于可持续的 CO ₂回收非常重要。在这项研究中，我们建立了一种用于大规模生产银纳米颗粒的简便合成方法，可用于将 CO ₂选择性电化学还原为 CO。AgNO _{3 的}热分解和还原以克级规模生产银纳米颗粒。产量高（超过 90%），粒度分布均匀。油胺封端的 Ag 纳米粒子是准球形的，直径为 9 ± 2 nm。银纳米粒子能够电化学 CO ₂还原成 CO，具有高活性和稳定性。催化剂的 CO 选择性在很宽的电位范围内接近 90%，在 -1.4 V vs. RHE 时达到 94.2%。Ag 纳米粒子在 24 小时内表现出良好的稳定性。研究了不同的表面官能团，例如硫醇和柠檬酸盐，以了解它们对 CO 选择性变化的影响。