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Coverage of capping ligands determining the selectivity of multi-carbon products and morphological evolution of Cu nanocatalysts in electrochemical reduction of CO2

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Title
Coverage of capping ligands determining the selectivity of multi-carbon products and morphological evolution of Cu nanocatalysts in electrochemical reduction of CO2
Author(s)
Oh, Yusik; Park, Jiwon; Kim, Yohan; Shim, Minyoung; Taek-Seung Kim; Jeong Young Park; Byon, Hye Ryung
Publication Date
2021-05
Journal
Journal of Materials Chemistry A, v.9, no.18, pp.11210 - 11218
Publisher
Royal Society of Chemistry
Abstract
© The Royal Society of Chemistry.Identifying the active sites of Cu nanoparticles that convert CO2 to multi-carbon (C2+) materials has remained elusive. It is caused by the reconstruction of Cu nanoparticles during electrochemical CO2 reduction and the unrevealed effect of capping ligands covering the Cu surface. We show that the C2+ selectivity and morphological evolution of Cu nanoparticles largely depend on the density of the capping ligand, tetradecylphosphonate (TDP). Ultraviolet-ozone pre-treatment of Cu nanoparticles reduced the density of TDP. Desorption of the remaining ligands was expedited within 3 h of the CO2 reduction process, and the concurrent aggregation of NPs formed bare Cu clusters. The increased C2+ selectivity of >50% faradaic efficiency revealed that the existing grain boundaries of Cu clusters promoted CO dimerization to produce C2+ materials. Despite similar cluster formation, Cu nanoparticles without ultraviolet-ozone treatment showed poor C2+ selectivity, suggesting that the remaining TDP, half of the original concentration, passivated the grain boundaries. Further the morphological transformation of Cu did not increase C2+ selectivity even after 20 h of the reaction. This journal is
URI
https://pr.ibs.re.kr/handle/8788114/9696
DOI
10.1039/d1ta01862k
ISSN
2050-7488
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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