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Electrochemical CO2 reduction to CO facilitated by MDEA-based deep eutectic solvent in aqueous solution

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  • Ahmad, Naveed
  • Wang, Xiaoxiao
  • Sun, Peixu
  • Chen, Ying
  • Rehman, Fahad
  • Xu, Jian
  • Xu, Xia

Abstract

Electrocatalytic CO2 reduction (ECO2R) is an environment-friendly way to convert CO2 into profitable products. Amine solution recently has been employed as an electrolyte in ECO2R but suffers from low efficiency. Herein, aqueous solutions containing different amine-based deep eutectic solvents (DESs) were used as electrolytes for CO2 reduction. The effect of different DESs on the CO2 reduction was investigated at Ag, Cu, and Zn metal electrodes. Tafel and electrochemical impedance spectroscopy (EIS) were applied to understand the CO2 reduction. DES in aqueous solution facilitates the CO2 reduction to CO with higher faradaic efficiency of CO (FECO) than amine solutions and a mixture of hydrogen bond acceptor (HBA) and hydrogen bond donor (HBD). Both HBD and HBA have an influence on CO2 reduction. [Monoethanolamine hydrochloride] [methyldiethanolamine] ([MEAHCl][MDEA]) gives high FECO, 71% FECO at −1.1 V vs RHE at Ag electrode, 33% higher than [MEAHCl][MEA]. Experimental results and EIS analysis reveal that the facilitation of CO2 reduction to CO probably stems from a synergistic effect of nano-size agglomerate dispersion on Ag-surface, bicarbonate formation, exchange current density, and Cl− ions present in DESs. These findings present a feasible method to employ the aqueous MDEA-based DES solution as an electrolyte for CO2 reduction.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:177:y:2021:i:c:p:23-33
    DOI: 10.1016/j.renene.2021.05.106
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    References listed on IDEAS

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    1. El Hadri, Nabil & Quang, Dang Viet & Goetheer, Earl L.V. & Abu Zahra, Mohammad R.M., 2017. "Aqueous amine solution characterization for post-combustion CO2 capture process," Applied Energy, Elsevier, vol. 185(P2), pages 1433-1449.
    2. Christiana Figueres & Corinne Le Quéré & Anand Mahindra & Oliver Bäte & Gail Whiteman & Glen Peters & Dabo Guan, 2018. "Emissions are still rising: ramp up the cuts," Nature, Nature, vol. 564(7734), pages 27-30, December.
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    Cited by:

    1. 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.
    2. Mengran Li & Erdem Irtem & Hugo-Pieter Iglesias van Montfort & Maryam Abdinejad & Thomas Burdyny, 2022. "Energy comparison of sequential and integrated CO2 capture and electrochemical conversion," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    3. Yurou Celine Xiao & Siyu Sonia Sun & Yong Zhao & Rui Kai Miao & Mengyang Fan & Geonhui Lee & Yuanjun Chen & Christine M. Gabardo & Yan Yu & Chenyue Qiu & Zunmin Guo & Xinyue Wang & Panagiotis Papangel, 2024. "Reactive capture of CO2 via amino acid," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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