Dataset Information

A direct coupled electrochemical system for capture and conversion of CO₂ from oceanwater.

ABSTRACT: Capture and conversion of CO₂ from oceanwater can lead to net-negative emissions and can provide carbon source for synthetic fuels and chemical feedstocks at the gigaton per year scale. Here, we report a direct coupled, proof-of-concept electrochemical system that uses a bipolar membrane electrodialysis (BPMED) cell and a vapor-fed CO₂ reduction (CO₂R) cell to capture and convert CO₂ from oceanwater. The BPMED cell replaces the commonly used water-splitting reaction with one-electron, reversible redox couples at the electrodes and demonstrates the ability to capture CO₂ at an electrochemical energy consumption of 155.4?kJ?mol^-1 or 0.98 kWh kg^-1 of CO₂ and a CO₂ capture efficiency of 71%. The direct coupled, vapor-fed CO₂R cell yields a total Faradaic efficiency of up to 95% for electrochemical CO₂ reduction to CO. The proof-of-concept system provides a unique technological pathway for CO₂ capture and conversion from oceanwater with only electrochemical processes.

SUBMITTER: Digdaya IA

PROVIDER: S-EPMC7474062 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

A direct coupled electrochemical system for capture and conversion of CO2 from oceanwater.

Digdaya Ibadillah A IA Sullivan Ian I Lin Meng M Han Lihao L Cheng Wen-Hui WH Atwater Harry A HA Xiang Chengxiang C

Nature communications 20200904 1

Capture and conversion of CO2 from oceanwater can lead to net-negative emissions and can provide carbon source for synthetic fuels and chemical feedstocks at the gigaton per year scale. Here, we report a direct coupled, proof-of-concept electrochemical system that uses a bipolar membrane electrodialysis (BPMED) cell and a vapor-fed CO2 reduction (CO2R) cell to capture and convert CO2 from oceanwater. The BPMED cell replaces the commonly used water-spli ...[more]

PMID: 32887872

Similar Datasets

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

A direct coupled electrochemical system for capture and conversion of CO₂ from oceanwater.

Publications

A direct coupled electrochemical system for capture and conversion of CO<sub>2</sub> from oceanwater.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets