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Highly efficient electrochemical upgrade of CO2 to CO using AMP capture solution as electrolyte

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  • Ahmad, Naveed
  • Chen, Ying
  • Wang, Xiaoxiao
  • Sun, Peixu
  • Bao, Yuting
  • Xu, Xia

Abstract

Electrochemical CO2 reduction reaction (ECO2RR) offers an eco-friendly way to produce value-added products by utilizing the waste CO2 from the environment. Recently, amines have been utilized as electrolytes for direct conversion of CO2 but processes were energy-intensive and lack selectivity due to the formation of highly stable carbamate. 2-amino-2-methyl-1-propanol (AMP) is a sterically hindered amine, produces less stable carbamate, and generates more HCO3−. Herein, ECO2RR performance using AMP aqueous solution as electrolyte was investigated over Ag, Cu, and Zn metal electrodes. Ultimately, 91 ± 7% CO selectivity on HCl modified polycrystalline Ag electrode at −0.91 V vs RHE in 1 M AMP aqueous solution in the presence of CTAB was achieved, 1.7 times greater than in 1 M aqueous ethanolamine (MEA) solution. Synergetic effects of unstable AMP-carbamate, generation of nano-agglomerates on pitted/porous Ag surface arising from HCl treatment, and a compact electrical double layer due to CTAB present are responsible for the high selectivity of CO. Our findings provide the understanding of electrode-electrolyte interactions and offer a facile strategy to directly convert CO2 to CO from CO2 capture solutions.

Suggested Citation

  • Ahmad, Naveed & Chen, Ying & Wang, Xiaoxiao & Sun, Peixu & Bao, Yuting & Xu, Xia, 2022. "Highly efficient electrochemical upgrade of CO2 to CO using AMP capture solution as electrolyte," Renewable Energy, Elsevier, vol. 189(C), pages 444-453.
    • Handle: RePEc:eee:renene:v:189:y:2022:i:c:p:444-453
    DOI: 10.1016/j.renene.2022.03.002
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    References listed on IDEAS

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    1. Ahmad, Naveed & Wang, Xiaoxiao & Sun, Peixu & Chen, Ying & Rehman, Fahad & Xu, Jian & Xu, Xia, 2021. "Electrochemical CO2 reduction to CO facilitated by MDEA-based deep eutectic solvent in aqueous solution," Renewable Energy, Elsevier, vol. 177(C), pages 23-33.
    2. Hemma Mistry & Ana Sofia Varela & Cecile S. Bonifacio & Ioannis Zegkinoglou & Ilya Sinev & Yong-Wook Choi & Kim Kisslinger & Eric A. Stach & Judith C. Yang & Peter Strasser & Beatriz Roldan Cuenya, 2016. "Correction: Corrigendum: Highly selective plasma-activated copper catalysts for carbon dioxide reduction to ethylene," Nature Communications, Nature, vol. 7(1), pages 1-1, December.
    3. Geonhui Lee & Yuguang C. Li & Ji-Yong Kim & Tao Peng & Dae-Hyun Nam & Armin Sedighian Rasouli & Fengwang Li & Mingchuan Luo & Alexander H. Ip & Young-Chang Joo & Edward H. Sargent, 2021. "Electrochemical upgrade of CO2 from amine capture solution," Nature Energy, Nature, vol. 6(1), pages 46-53, January.
    4. Hemma Mistry & Ana Sofia Varela & Cecile S. Bonifacio & Ioannis Zegkinoglou & Ilya Sinev & Yong-Wook Choi & Kim Kisslinger & Eric A. Stach & Judith C. Yang & Peter Strasser & Beatriz Roldan Cuenya, 2016. "Highly selective plasma-activated copper catalysts for carbon dioxide reduction to ethylene," Nature Communications, Nature, vol. 7(1), pages 1-9, November.
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