一种钙钛矿型钛酸镧纳米片作为在酸性介质中将氮气人工固定为氨的高效电催化剂。

A perovskite LaTiO nanosheet as an efficient electrocatalyst for artificial N fixation to NH in acidic media.

作者信息

Yu Jiali, Li Chengbo, Li Bingyue, Zhu Xiaojuan, Zhang Rong, Ji Lei, Tang Dianping, Asiri Abdullah M, Sun Xuping, Li Quan, Liu Shanhu, Luo Yonglan

机构信息

College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, Sichuan, China.

出版信息

Chem Commun (Camb). 2019 May 30;55(45):6401-6404. doi: 10.1039/c9cc02310k.

DOI:10.1039/c9cc02310k

PMID:31094366

Abstract

The synthesis of NH3 heavily relies on the Haber-Bosch process suffering from a large amount of CO2 emission and energy consumption. Possessing eco-friendly and sustainable characteristics, electrochemical reduction is considered as a promising candidate for artificial N2 fixation under ambient conditions, but efficient electrocatalysts are crucial for the N2 reduction reaction (NRR). In this communication, we report that perovskite La2Ti2O7 nanosheets behave as an efficient NRR electrocatalyst with excellent selectivity under ambient conditions. In 0.1 M HCl, this catalyst achieves a high NH3 yield rate of 25.15 μg h-1 mgcat.-1 with a faradaic efficiency of 4.55% at -0.55 V vs. a reversible hydrogen electrode. Notably, it also shows high electrochemical stability.

摘要

氨的合成严重依赖哈伯-博施法，该方法存在大量二氧化碳排放和能源消耗的问题。电化学还原具有环境友好和可持续的特点，被认为是在环境条件下人工固氮的一个有前景的候选方法，但高效的电催化剂对于氮还原反应（NRR）至关重要。在本通讯中，我们报道了钙钛矿La2Ti2O7纳米片在环境条件下表现为一种具有优异选择性的高效NRR电催化剂。在0.1 M HCl中，该催化剂在相对于可逆氢电极-0.55 V的电位下实现了25.15 μg h-1 mgcat.-1的高氨产率，法拉第效率为4.55%。值得注意的是，它还表现出高电化学稳定性。