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Steric Hindrance-Derived Li+ Solvation to Enhance Lithium-Mediated Nitrogen Reduction
ACS Energy Letters ( IF 19.3 ) Pub Date : 2024-10-23 , DOI: 10.1021/acsenergylett.4c02626
Yebin Han, Chaeeun Lim, Youngbi Kim, Hyerim Baek, Sangmin Jeon, Jeong Woo Han, Kijung Yong

This study proposes a steric hindrance-derived electrolyte (STE) to generate Li+ anion-rich solvation structures to enhance the Li-mediated nitrogen reduction reaction (Li-NRR), a promising electrochemical green ammonia synthesis method. The STE applied methylation of the alpha proton in the tetrahydrofuran (THF) solvent, which dissolved lithium salts, leading to the weak solvation of Li+ and generating an anion-rich-solvated structure. The resultant anion-derived solid electrolyte interphase with thin and uniform inorganic properties improved the selectivity, energy efficiency (EE), and stability of the Li-NRR process. Additionally, the anion-rich solvation exhibited antireduction stability and inhibited electrolyte decomposition. Consequently, the STE achieved a 2-fold increase in Faradaic efficiency and NH3 yield rate (65.8% and 90.8 nmol cm–2 s–1, respectively) compared to the THF-single electrolyte (35.7% and 49.3 nmol cm–2 s–1) while increasing the EE by 1.5 times.

中文翻译:


空间位阻衍生的 Li+ 溶剂化增强锂介导的氮还原



本研究提出了一种空间位阻衍生电解质 (STE) 来生成富含 Li+ 阴离子的溶剂化结构,以增强 Li 介导的氮还原反应 (Li-NRR),这是一种很有前途的电化学绿氨合成方法。STE 在四氢呋喃 (THF) 溶剂中应用 α 质子的甲基化,溶解锂盐,导致 Li+ 的弱溶剂化并产生富含阴离子的溶剂化结构。所得阴离子衍生的固体电解质界面具有薄而均匀的无机特性,提高了 Li-NRR 工艺的选择性、能效 (EE) 和稳定性。此外,富含阴离子的溶剂化反应表现出抗还原稳定性并抑制电解质分解。因此,与 THF 单一电解质(35.7% 和 49.3 nmol cm–2 s–1)相比,STE 的法拉第效率和 NH3 产率提高了 2 倍(分别为 65.8% 和 90.8 nmol cm–2 s–1),同时将 EE 提高了 1.5 倍。
更新日期:2024-10-23
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