Journal
RENEWABLE ENERGY
Volume 177, Issue -, Pages 23-33Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2021.05.106
Keywords
Electrochemical CO2 reduction; Deep eutectic solvent; CO; Amines; Sustainable chemistry
Funding
- National Natural Science Foundation of China [91534107, 21978001]
- Wanjiang Scholar Program
- Start Fund for Biochemical Engineering Research Center from Anhui University of Technology
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Electrocatalytic CO2 reduction using amine-based deep eutectic solvents (DES) in aqueous solution shows higher efficiency in converting CO2 to CO compared to traditional amine solutions. The use of [MEAHCI][MDEA] as an electrolyte results in a faradaic efficiency of 71% at Ag electrode, showing promise for future applications in CO2 reduction.
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 CO(2 )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] ([MEAHCI][MDEA]) gives high FECO, 71% FECO at -1.1 V vs RHE at Ag electrode, 33% higher than [MEAHCI][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. (C) 2021 Elsevier Ltd. All rights reserved.
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