Dynamic Reconstruction of Cu Catalyst Under Electrochemical NO Reduction to NH 3 .

Autor: Cheon S; Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea., Kim B; Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea., Kim HW; Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea., Kim D; Research Institute, Bluetec, 141 Gajeong-ro, Yuseong-gu, Daejeon, 34114, Republic of Korea., Han JI; Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
Jazyk: angličtina
Zdroj: ChemSusChem [ChemSusChem] 2024 Oct 24, pp. e202401978. Date of Electronic Publication: 2024 Oct 24.
DOI: 10.1002/cssc.202401978
Abstrakt: The electrochemical reduction of nitric oxide (NO) to ammonia (NH 3 ) 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 NH 3 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 NH 3 . 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 NH 3 synthesis from NO.
(© 2024 Wiley-VCH GmbH.)
Databáze: MEDLINE
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