Journal
CHINESE JOURNAL OF CATALYSIS
Volume 43, Issue 7, Pages 1687-1696Publisher
ELSEVIER
DOI: 10.1016/S1872-2067(21)63970-0
Keywords
Methane; Room temperature ionic liquid; Metal organic framework; Catalyst design; DFT calculation; CO(2 )electroreduction
Funding
- Research Grants Council [16310419, 16309418, 16304821]
- Innovation and Technology Commission [ITC-CNERC14EG03]
- Jiangsu Key Laboratory for the Chemistry of Low-Dimensional Materials [JSKC19016]
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The electrochemical reduction of CO2 to hydrocarbons is a promising technology for utilizing CO2, preventing its accumulation in the atmosphere, and storing renewable energy. In this study, hybrid electrocatalysts consisting of metal-organic frameworks and room temperature ionic liquids were designed to selectively reduce CO2 to CH4, achieving high faradaic efficiencies.
The electrochemical reduction of CO2 towards hydrocarbons is a promising technology that can utilize CO2 and prevent its atmospheric accumulation while simultaneously storing renewable energy. However, current CO2 electrolyzers remain impractical on a large scale due to the low current densities and faradaic efficiencies (FE) on various electrocatalysts. In this study, hybrid HKUST-1 metal-organic framework???fluorinated imidazolium-based room temperature ionic liquid (RTIL) electrocatalysts are designed to selectively reduce CO2 to CH4. An impressive FE of 65.5% towards CH4 at ???1.13 V is achieved for the HKUST-1/[BMIM][PF6] hybrid, with a stable FE greater than 50% maintained for at least 9 h in an H-cell. The observed improvements are attributed to the increased local CO2 concentration and the improved CO2-to-CH4 thermodynamics in the presence of the RTIL molecules adsorbed on the HKUST-1-derived Cu clusters. These findings offer a novel approach of immobilizing RTIL co-catalysts within porous frameworks for CO2 electroreduction applications. Published by Elsevier B.V. All rights reserved.
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