Electrochemical Reduction of Carbon Dioxide in a Monoethanolamine Capture Medium

Lu Chen, Fengwang Li, Ying Zhang, Cameron L. Bentley, Mike Horne, Alan M. Bond, Jie Zhang

Research output: Contribution to journalArticleResearchpeer-review

12 Citations (Scopus)

Abstract

The electrocatalytic reduction of CO2 in a 30 % (w/w) monoethanolamine (MEA) aqueous solution was undertaken at In, Sn, Bi, Pb, Pd, Ag, Cu and Zn metal electrodes. Upon the dissolution of CO2, the non-conducting MEA solution is transformed into a conducting one, as is required for the electrochemical reduction of CO2. Both an increase in the electrode surface porosity and the addition of the surfactant cetyltrimethylammonium bromide (CTAB) suppress the competing hydrogen evolution reaction; the latter has a significantly stronger impact. The combination of a porous metal electrode and the addition of 0.1 % (w/w) CTAB results in the reduction of molecular CO2 to CO and formate ions, and the product distribution is highly dependent on the identity of the metal electrode used. At a potential of −0.8 V versus the reversible hydrogen electrode (RHE) with an indium electrode with a coralline-like structure, the faradaic efficiencies for the generation of CO and [HCOO] ions are 22.8 and 54.5 %, respectively compared to efficiencies of 2.9 and 60.8 % with a porous lead electrode and 38.2 and 2.4 % with a porous silver electrode. Extensive data for the other five electrodes are also provided. The optimal conditions for CO2 reduction are identified, and mechanistic details for the reaction pathways are proposed in this proof-of-concept electrochemical study in a CO2 capture medium. The conditions and features needed to achieve industrially and commercially viable CO2 reduction in an amine-based capture medium are considered.

Original languageEnglish
Pages (from-to)4109-4118
Number of pages10
JournalChemSusChem
Volume10
Issue number20
DOIs
Publication statusPublished - 23 Oct 2017

Keywords

  • adsorption
  • amines
  • electrochemistry
  • reduction
  • surfactants

Cite this

Chen, Lu ; Li, Fengwang ; Zhang, Ying ; Bentley, Cameron L. ; Horne, Mike ; Bond, Alan M. ; Zhang, Jie. / Electrochemical Reduction of Carbon Dioxide in a Monoethanolamine Capture Medium. In: ChemSusChem. 2017 ; Vol. 10, No. 20. pp. 4109-4118.
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Electrochemical Reduction of Carbon Dioxide in a Monoethanolamine Capture Medium. / Chen, Lu; Li, Fengwang; Zhang, Ying; Bentley, Cameron L.; Horne, Mike; Bond, Alan M.; Zhang, Jie.

In: ChemSusChem, Vol. 10, No. 20, 23.10.2017, p. 4109-4118.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Electrochemical Reduction of Carbon Dioxide in a Monoethanolamine Capture Medium

AU - Chen, Lu

AU - Li, Fengwang

AU - Zhang, Ying

AU - Bentley, Cameron L.

AU - Horne, Mike

AU - Bond, Alan M.

AU - Zhang, Jie

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Y1 - 2017/10/23

N2 - The electrocatalytic reduction of CO2 in a 30 % (w/w) monoethanolamine (MEA) aqueous solution was undertaken at In, Sn, Bi, Pb, Pd, Ag, Cu and Zn metal electrodes. Upon the dissolution of CO2, the non-conducting MEA solution is transformed into a conducting one, as is required for the electrochemical reduction of CO2. Both an increase in the electrode surface porosity and the addition of the surfactant cetyltrimethylammonium bromide (CTAB) suppress the competing hydrogen evolution reaction; the latter has a significantly stronger impact. The combination of a porous metal electrode and the addition of 0.1 % (w/w) CTAB results in the reduction of molecular CO2 to CO and formate ions, and the product distribution is highly dependent on the identity of the metal electrode used. At a potential of −0.8 V versus the reversible hydrogen electrode (RHE) with an indium electrode with a coralline-like structure, the faradaic efficiencies for the generation of CO and [HCOO]− ions are 22.8 and 54.5 %, respectively compared to efficiencies of 2.9 and 60.8 % with a porous lead electrode and 38.2 and 2.4 % with a porous silver electrode. Extensive data for the other five electrodes are also provided. The optimal conditions for CO2 reduction are identified, and mechanistic details for the reaction pathways are proposed in this proof-of-concept electrochemical study in a CO2 capture medium. The conditions and features needed to achieve industrially and commercially viable CO2 reduction in an amine-based capture medium are considered.

AB - The electrocatalytic reduction of CO2 in a 30 % (w/w) monoethanolamine (MEA) aqueous solution was undertaken at In, Sn, Bi, Pb, Pd, Ag, Cu and Zn metal electrodes. Upon the dissolution of CO2, the non-conducting MEA solution is transformed into a conducting one, as is required for the electrochemical reduction of CO2. Both an increase in the electrode surface porosity and the addition of the surfactant cetyltrimethylammonium bromide (CTAB) suppress the competing hydrogen evolution reaction; the latter has a significantly stronger impact. The combination of a porous metal electrode and the addition of 0.1 % (w/w) CTAB results in the reduction of molecular CO2 to CO and formate ions, and the product distribution is highly dependent on the identity of the metal electrode used. At a potential of −0.8 V versus the reversible hydrogen electrode (RHE) with an indium electrode with a coralline-like structure, the faradaic efficiencies for the generation of CO and [HCOO]− ions are 22.8 and 54.5 %, respectively compared to efficiencies of 2.9 and 60.8 % with a porous lead electrode and 38.2 and 2.4 % with a porous silver electrode. Extensive data for the other five electrodes are also provided. The optimal conditions for CO2 reduction are identified, and mechanistic details for the reaction pathways are proposed in this proof-of-concept electrochemical study in a CO2 capture medium. The conditions and features needed to achieve industrially and commercially viable CO2 reduction in an amine-based capture medium are considered.

KW - adsorption

KW - amines

KW - electrochemistry

KW - reduction

KW - surfactants

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U2 - 10.1002/cssc.201701075

DO - 10.1002/cssc.201701075

M3 - Article

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SP - 4109

EP - 4118

JO - ChemSusChem

JF - ChemSusChem

SN - 1864-5631

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