IONIC LIQUIDS AS POTENTIAL CO-CATALYST FOR CO2 ELECTROCHEMICAL REDUCTION

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Published: Jul 31, 2024
DOI: https://doi.org/10.22452/mjs.vol43sp1.9
Keywords:
Ionic liquids CO2 conversion electrochemical reduction COSMO-RS Turbomole

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Sulafa Abdalmageed Saadaldeen Mohammed
Chemical Engineering Department, City, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, MALAYSIA
https://orcid.org/0000-0001-7607-6165
Wan Zaireen Nisa Yahya
Chemical Engineering Department, City, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, MALAYSIA
https://orcid.org/0000-0002-8211-3329
Mohamad Azmi Bustam
Centre for Research in Ionic Liquid, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, MALAYSIA.
https://orcid.org/0000-0001-8809-5013
Muzamil A.Hassan
Centre for Biofuel and Biochemical Research, Institute for Sustainable Building, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, MALAYSIA
Asiah Nusaibah Masri
Energy Engineering Department, School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, MALAYSIA.
https://orcid.org/0000-0003-1144-9420
Md Golam Kibria
Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, NW, Calgary, Alberta T2N 1N4, CANADA.

Abstract

Carbon dioxide electrochemical reduction (CO2ER) presents numerous advantages in mitigating greenhouse gas emissions by converting CO2 into value-added chemicals and can be integrated with renewable energy sources such as solar and wind. Nevertheless, establishing an electrochemically stable catalytic system that can effectively decrease the overpotential while maintaining high current density and faradaic efficiency is challenging. The precise mechanisms causing the reactions and the specific functions of the electrode with electrolytes are still not fully understood. Hence, a significant increase in attention has been paid to using ionic liquids (ILs) as electrolytes for CO2ER. This phenomenon is attributed to the unique capabilities of ILs to reduce overpotential, increase current density, and improve electrochemical stability. Therefore, this study evaluated the effect of incorporating ILs into electrolytes to comprehend the cation and anion influences on CO2ER reactions. Linear sweep voltammetry (LSV) and chronoamperometry (CA) were employed to examine the reduction peaks and current density values for different electrolytes, respectively. Consequently, a 0.1 M NBu4PF6 acetonitrile solution containing 1-ethyl-3-methylimidazolium tetrafluoroborate [EMIM][BF4] demonstrated a significantly lower onset potential of the reduction by 320 mV. A reduced CO2ER efficiency involving ILs with long alkyl chains was also observed. Meanwhile, a novel hypothesis concerning molecular orbitals for the CO2ER reaction mechanism was discussed. Overall, various performance variables (reduction stability, applied potential, and current density) of CO2ER were improved using cations with short alkyl chains, anions with high highest occupied molecular orbital (HOMO) levels, and appropriate solvation media. These findings can serve as selection criteria to aid in choosing appropriate ionic liquids for CO2 electrochemical reduction (CO2ER).

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How to Cite
Saadaldeen Mohammed, S. A., Nisa Yahya, W. Z., Bustam, M. A. ., A.Hassan, M., Masri, A. N. ., & Md Golam Kibria. (2024). IONIC LIQUIDS AS POTENTIAL CO-CATALYST FOR CO2 ELECTROCHEMICAL REDUCTION. Malaysian Journal of Science, 43(Sp1), 50–57. https://doi.org/10.22452/mjs.vol43sp1.9
Issue
Vol. 43 No. Sp1 (2024): Special Issue: 2nd Euro-Asia Conference on CO2 Capture and Utilization (EACCO2CU2022)
Section
EACCO2CU2022

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