Electrocatalytic reduction of simulated industrial CO2 and CO mixtures: revising chronoamperometry to enable selective gas mixture reduction via cyclic voltammetry
While substantial advancements have been achieved in the electrocatalytic reduction of pure CO2 or CO, the reduction of carbon oxide mixtures remains underexplored, a key limitation in scaling the technology for industrial applications. This underexplored domain gains practical importance by conside...
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sg-ntu-dr.10356-1756192024-05-01T15:36:57Z Electrocatalytic reduction of simulated industrial CO2 and CO mixtures: revising chronoamperometry to enable selective gas mixture reduction via cyclic voltammetry Chen, Wen Qian Foo, Cyrus Jit Loong Ge, Liya Veksha, Andrei Chan, Wei Ping Shen, Yafei Lisak, Grzegorz School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute Residues and Resource Reclamation Centre (R3C) Engineering Electrochemical reduction Cyclic voltammetry While substantial advancements have been achieved in the electrocatalytic reduction of pure CO2 or CO, the reduction of carbon oxide mixtures remains underexplored, a key limitation in scaling the technology for industrial applications. This underexplored domain gains practical importance by considering carbon oxide mixtures, given that CO and CO2 together constitute a large proportion of diverse industrial gas streams. However, the simultaneous reduction of mixed CO and CO2 poses a potential challenge due to their differing optimal reduction potentials, which complicates an efficient reduction process. While cyclic voltammetry (CV) is typically used for characterization, which involves sweeping between positive and negative potentials, we utilized it to conduct reduction reactions within a defined negative potential window. This approach, serving as an alternative to conventional chronoamperometry that maintains a constant potential, ensures a continuous reduction reaction throughout the entire cycling process. By employing cycling between the optimized reduction potentials of CO2 (−1.4 V) and CO (−1.6 V), CV achieved an increase in production efficiency, ranging from 25 % to 40 % for predominant products (HCOOH and C2H4), in comparison to chronoamperometry. Meanwhile, the results underscored the dependency of performance enhancement on the scan rate of cycling, revealing plausible correlations with mass transfer and electrode surface dynamics. Furthermore, the findings indicated that the selectivity towards HCOOH and C2H4 is closely related to the CO2/CO ratios of gas sources. This provides insight into the potential for modulating selectivity of industrial gas reduction for improved product quality and customization. Agency for Science, Technology and Research (A*STAR) National Research Foundation (NRF) Public Utilities Board (PUB) Submitted/Accepted version This research is supported by A*STAR under its RIE2025 Industry Alignment Fund – Industry Collaboration Projects (IAF-ICP) Programme (Award I2101E0006). This research is also supported by the National Research Foundation, Singapore, and PUB, Singapore’s National Water Agency under its RIE2025 Urban Solutions and Sustainability (USS) (Water) Centre of Excellence (CoE) Programme which provides funding to the Nanyang Environment & Water Research Institute (NEWRI) of the Nanyang Technological University, Singapore (NTU). 2024-04-30T07:32:56Z 2024-04-30T07:32:56Z 2024 Journal Article Chen, W. Q., Foo, C. J. L., Ge, L., Veksha, A., Chan, W. P., Shen, Y. & Lisak, G. (2024). Electrocatalytic reduction of simulated industrial CO2 and CO mixtures: revising chronoamperometry to enable selective gas mixture reduction via cyclic voltammetry. Chemical Engineering Journal, 487, 150602-. https://dx.doi.org/10.1016/j.cej.2024.150602 1385-8947 https://hdl.handle.net/10356/175619 10.1016/j.cej.2024.150602 2-s2.0-85188680021 487 150602 en I2101E0006 Chemical Engineering Journal © 2024 Elsevier B.V. All rights reserved. This article may be downloaded for personal use only. Any other use requires prior permission of the copyright holder. The Version of Record is available online at http://doi.org/10.1016/j.cej.2024.150602. application/pdf |
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Engineering Electrochemical reduction Cyclic voltammetry Chen, Wen Qian Foo, Cyrus Jit Loong Ge, Liya Veksha, Andrei Chan, Wei Ping Shen, Yafei Lisak, Grzegorz Electrocatalytic reduction of simulated industrial CO2 and CO mixtures: revising chronoamperometry to enable selective gas mixture reduction via cyclic voltammetry |
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While substantial advancements have been achieved in the electrocatalytic reduction of pure CO2 or CO, the reduction of carbon oxide mixtures remains underexplored, a key limitation in scaling the technology for industrial applications. This underexplored domain gains practical importance by considering carbon oxide mixtures, given that CO and CO2 together constitute a large proportion of diverse industrial gas streams. However, the simultaneous reduction of mixed CO and CO2 poses a potential challenge due to their differing optimal reduction potentials, which complicates an efficient reduction process. While cyclic voltammetry (CV) is typically used for characterization, which involves sweeping between positive and negative potentials, we utilized it to conduct reduction reactions within a defined negative potential window. This approach, serving as an alternative to conventional chronoamperometry that maintains a constant potential, ensures a continuous reduction reaction throughout the entire cycling process. By employing cycling between the optimized reduction potentials of CO2 (−1.4 V) and CO (−1.6 V), CV achieved an increase in production efficiency, ranging from 25 % to 40 % for predominant products (HCOOH and C2H4), in comparison to chronoamperometry. Meanwhile, the results underscored the dependency of performance enhancement on the scan rate of cycling, revealing plausible correlations with mass transfer and electrode surface dynamics. Furthermore, the findings indicated that the selectivity towards HCOOH and C2H4 is closely related to the CO2/CO ratios of gas sources. This provides insight into the potential for modulating selectivity of industrial gas reduction for improved product quality and customization. |
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School of Civil and Environmental Engineering |
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School of Civil and Environmental Engineering Chen, Wen Qian Foo, Cyrus Jit Loong Ge, Liya Veksha, Andrei Chan, Wei Ping Shen, Yafei Lisak, Grzegorz |
format |
Article |
author |
Chen, Wen Qian Foo, Cyrus Jit Loong Ge, Liya Veksha, Andrei Chan, Wei Ping Shen, Yafei Lisak, Grzegorz |
author_sort |
Chen, Wen Qian |
title |
Electrocatalytic reduction of simulated industrial CO2 and CO mixtures: revising chronoamperometry to enable selective gas mixture reduction via cyclic voltammetry |
title_short |
Electrocatalytic reduction of simulated industrial CO2 and CO mixtures: revising chronoamperometry to enable selective gas mixture reduction via cyclic voltammetry |
title_full |
Electrocatalytic reduction of simulated industrial CO2 and CO mixtures: revising chronoamperometry to enable selective gas mixture reduction via cyclic voltammetry |
title_fullStr |
Electrocatalytic reduction of simulated industrial CO2 and CO mixtures: revising chronoamperometry to enable selective gas mixture reduction via cyclic voltammetry |
title_full_unstemmed |
Electrocatalytic reduction of simulated industrial CO2 and CO mixtures: revising chronoamperometry to enable selective gas mixture reduction via cyclic voltammetry |
title_sort |
electrocatalytic reduction of simulated industrial co2 and co mixtures: revising chronoamperometry to enable selective gas mixture reduction via cyclic voltammetry |
publishDate |
2024 |
url |
https://hdl.handle.net/10356/175619 |
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1814047365802229760 |