Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/162744
Title: Elucidating reaction pathways of the CO₂ electroreduction via tailorable tortuosities and oxidation states of Cu nanostructures
Authors: Liu, Guanyu
Adesina, Peace
Nasiri, Noushin
Wang, Haojing
Sheng, Yuan
Wu, Shuyang
Kraft, Markus
Lapkin, Alexei A.
Ager, Joel W.
Xu, Rong
Keywords: Engineering::Chemical engineering
Issue Date: 2022
Source: Liu, G., Adesina, P., Nasiri, N., Wang, H., Sheng, Y., Wu, S., Kraft, M., Lapkin, A. A., Ager, J. W. & Xu, R. (2022). Elucidating reaction pathways of the CO₂ electroreduction via tailorable tortuosities and oxidation states of Cu nanostructures. Advanced Functional Materials, 32(36), 2204993-. https://dx.doi.org/10.1002/adfm.202204993
Journal: Advanced Functional Materials
Abstract: Copper-based 3D fractal nanostructures are integrated on the electrodes using a scalable and ink-free flame aerosol synthesis technique for electrochemical CO2 reduction. The effects of tortuosity and oxidation state of copper are respectively investigated by isolating each effect from the others. By balancing the intermediate confinement and local availability of CO2, CuO-derived Cu with optimal tortuosity exhibits a Faradaic efficiency of 65% toward C2+ products at an applied potential of −1.04 V versus reversible hydrogen electrode. A subsequent study of the effects of the oxidation state, which is free from the influence of tortuosity, reveals that Cu2+-derived Cu demonstrates suppressed hydrogen evolution reaction and a higher C2+/CH4 ratio than metallic Cu. The preference for the formation of both ethanol and n-propanol versus ethylene, is found to follow the trend from metallic Cu > Cu2+-derived Cu > Cu+-derived Cu toward alcohols’ formation. These findings elucidate the underlying causes for the effects of tortuosity of porous Cu electrodes on selectivity and provide insights into the specific effects of the initial oxidation state on various reaction pathways during electrochemical CO2 reduction.
URI: https://hdl.handle.net/10356/162744
ISSN: 1616-301X
DOI: 10.1002/adfm.202204993
Rights: © 2022 Wiley-VCH GmbH. All rights reserved. This is the peer reviewed version of the following article: Liu, G., Adesina, P., Nasiri, N., Wang, H., Sheng, Y., Wu, S., Kraft, M., Lapkin, A. A., Ager, J. W. & Xu, R. (2022). Elucidating reaction pathways of the CO₂ electroreduction via tailorable tortuosities and oxidation states of Cu nanostructures. Advanced Functional Materials, 32(36), 2204993-, which has been published in final form at https://doi.org/10.1002/adfm.202204993. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: embargo_20230912
Fulltext Availability: With Fulltext
Appears in Collections:SCBE Journal Articles

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