电化学将 NO 还原成 NH3 时 Cu 催化剂的动态重构。

IF 7.5 2区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
ChemSusChem Pub Date : 2024-10-24 DOI:10.1002/cssc.202401978
Seonjeong Cheon, Beomseo Kim, Hyun-Woo Kim, DongYeon Kim, Jong-In Han
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引用次数: 0

摘要

将一氧化氮(NO)电化学还原成氨气(NH3)是同时处理空气污染物和生产有用化学品的一种可持续方法。在候选催化剂中,铜因其出色的 NH3 选择性和生产率而脱颖而出。然而,有关其在氮氧化物还原环境中的催化行为的全面研究还很缺乏。在此,我们揭示了铜催化剂在氮氧化物还原过程中的动态重排:出现了一种取决于外加电势的束状纳米线结构。这种独特的结构与双层电容的增强密切相关,导致电流密度在 1 小时内从 236 mA cm-2 逐步增加 20%,同时对 NH3 的法拉第效率保持在 95%。对铜氧化态的表征表明,纳米结构是铜在水性电解质中溶解-再沉积的结果,受到与 NO 或其他反应性中间产物相互作用的影响。这一认识有助于对铜基催化剂进行更广泛的探索,以实现从 NO 到 NH3 的可持续高效合成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Dynamic Reconstruction of Cu Catalyst Under Electrochemical NO Reduction to NH3

Dynamic Reconstruction of Cu Catalyst Under Electrochemical NO Reduction to NH3

The electrochemical reduction of nitric oxide (NO) to ammonia (NH3) offers a sustainable way of simultaneously treating the air pollutant and producing a useful chemical. Among catalyst candidates, Cu emerges as a stand-out choice for its superb NH3 selectivity and production rate. However, a comprehensive study concerning its catalytic behavior in the NO reduction environment is still lacking. Here, we unravel the dynamic rearrangement of Cu catalysts during NO reduction: the emergence of a bundled nanowire structure dependent on the applied potential. This unique structure is closely linked to an enhancement in double-layer capacitance, leading to a progressive increase in current density from 236 mA cm−2 by 20 % over 1 h, while maintaining a Faradaic efficiency of 95 % for NH3. Characterizations of Cu oxidation states suggest that the nanostructure results from the dissolution-redeposition of Cu in the aqueous electrolyte, influenced by the interaction with NO or other reactive intermediates. This understanding contributes to the broader exploration of Cu-based catalysts for sustainable and efficient NH3 synthesis from NO.

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来源期刊
ChemSusChem
ChemSusChem 化学-化学综合
CiteScore
15.80
自引率
4.80%
发文量
555
审稿时长
1.8 months
期刊介绍: ChemSusChem Impact Factor (2016): 7.226 Scope: Interdisciplinary journal Focuses on research at the interface of chemistry and sustainability Features the best research on sustainability and energy Areas Covered: Chemistry Materials Science Chemical Engineering Biotechnology
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