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Energy comparison of sequential and integrated CO₂ capture and electrochemical conversion.

ABSTRACT: Integrating carbon dioxide (CO₂) electrolysis with CO₂ capture provides exciting new opportunities for energy reductions by simultaneously removing the energy-demanding regeneration step in CO₂ capture and avoiding critical issues faced by CO₂ gas-fed electrolysers. However, understanding the potential energy advantages of an integrated process is not straightforward due to the interconnected processes which require knowledge of both capture and electrochemical conversion processes. Here, we identify the upper limits of the integrated process from an energy perspective by comparing the working principles and performance of integrated and sequential approaches. Our high-level energy analyses unveil that an integrated electrolyser must show similar performance to the gas-fed electrolyser to ensure an energy benefit of up to 44% versus the sequential route. However, such energy benefits diminish if future gas-fed electrolysers resolve the CO₂ utilisation issue and if an integrated electrolyser shows lower conversion efficiencies than the gas-fed system.

SUBMITTER: Li M

PROVIDER: S-EPMC9474516 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature

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Energy comparison of sequential and integrated CO2 capture and electrochemical conversion.

Li Mengran M Irtem Erdem E Iglesias van Montfort Hugo-Pieter HP Abdinejad Maryam M Burdyny Thomas T

Nature communications 20220914 1

Integrating carbon dioxide (CO2) electrolysis with CO2 capture provides exciting new opportunities for energy reductions by simultaneously removing the energy-demanding regeneration step in CO2 capture and avoiding critical issues faced by CO2 gas-fed electrolysers. However, understanding the potential energy advantages of an integrated process is not straightforward due to the interconnected processes which require knowledge of both capture and electr ...[more]

PMID: 36104350

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Project description:Integrating CO2 capture and electrochemical conversion has been proposed as a strategy to reduce the net energy required for CO2 regeneration in traditional CO2 capture and conversion schemes and can be coupled with carbon-free renewable electricity. Polyethylenimine (PEI)-based materials have been previously studied as CO2 capture materials and can be integrated in these reactive capture processes. PEI-based electrolytes have been found to significantly increase the CO2 loading, and impact selectivity and rate of product formation when compared to the conventional aqueous electrolytes. However, the influence of these materials at the catalyst-electrode interface is currently not well understood. In this study, PEI-based electrolytes were prepared and their impact on the morphology of a silver electrode performing electrochemical CO2 reduction (CO2R) was studied using in situ electrochemical atomic force microscopy (EC-AFM). The presence of PEI on the electrode surface could be distinguished based on nanomechanical properties (DMT modulus), and changes were observed as negative polarization was applied, revealing a reorganization of the PEI chains due to electrostatic interactions. These changes were impacted by the electrolyte composition, including the addition of supporting electrolyte KHCO3 salt, as well as CO2 captured by the PEI-based electrolyte, which minimized the change in surface mechanical properties and degree of PEI alignment on the electrode surface. The changes in surface mechanical properties were also dependent on the PEI polymer length, with higher molecular weight PEI showing different reconfiguration than the shorter polymer brushes. The study highlights that the choice of polymer material, the electrolyte composition, and CO2 captured impact the near-electrode environment, which has implications for CO2R, and presents EC-AFM as a new tool that can be used to probe the dynamic behavior of these interfaces during electrocatalysis.

Dataset Information

Energy comparison of sequential and integrated CO₂ capture and electrochemical conversion.

Publications

Energy comparison of sequential and integrated CO<sub>2</sub> capture and electrochemical conversion.

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