Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.
Chem Commun (Camb). 2018 Oct 9;54(81):11427-11430. doi: 10.1039/c8cc06365f.
The industrial-scale NH3 production still heavily depends on the Haber-Bosch process which demands not only high energy consumption but emits a large amount of CO2. Electrochemical fixation of N2 to NH3 under ambient conditions is regarded as an eco-friendly and sustainable approach, but stable and efficient electrocatalysts are demanded for the N2 reduction reaction (NRR). In this work, we report our recent finding that an Ag nanosheet acts as a high-performance NRR electrocatalyst at room temperature and pressure. Electrochemical tests in 0.1 M HCl reveal that such a catalyst achieves a high Faradaic efficiency of 4.8% and a NH3 yield rate of 4.62 × 10-11 mol s-1 cm-2 at -0.60 V vs. reversible hydrogen electrode (RHE), rivaling the performances of most of the reported aqueous-based NRR electrocatalysts. Additionally, the Ag nanosheet also shows excellent selectivity, strong long-term electrochemical stability and durability.
工业规模的 NH3 生产仍然严重依赖哈伯-博世工艺，该工艺不仅需要高能耗，还会排放大量的 CO2。在环境条件下电化学固定 N2 为 NH3 被认为是一种环保且可持续的方法，但需要稳定且高效的电催化剂来进行 N2 还原反应 (NRR)。在这项工作中，我们报告了最近的发现，即在室温和常压下，Ag 纳米片作为一种高性能的 NRR 电催化剂。在 0.1 M HCl 中的电化学测试表明，该催化剂在相对于可逆氢电极 (RHE) 的-0.60 V 下实现了 4.8%的高法拉第效率和 4.62×10-11 mol s-1 cm-2 的 NH3 产率，可与大多数已报道的基于水的 NRR 电催化剂相媲美。此外，Ag 纳米片还表现出优异的选择性、强的长期电化学稳定性和耐久性。
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