Dataset Information

Highly efficient electrochemical reduction of CO₂ to CH₄ in an ionic liquid using a metal-organic framework cathode.

ABSTRACT: Highly efficient electrochemical reduction of CO₂ to CH₄ is of great importance, but is challenging. Herein, Zn-1,3,5-benzenetricarboxylic acid metal-organic frameworks (Zn-BTC MOFs) deposited on carbon paper (CP) were used as cathodes in electrochemical reduction of CO₂ using ionic liquids (ILs) as the electrolytes, which was the first work on combination of a MOF electrode and an pure IL electrolyte in the electrochemical reduction of CO₂. It was found that the efficiency of the reaction depended strongly on the morphology of the Zn-MOFs. Compared with the commonly used metal electrodes, the electrochemical reaction showed much higher selectivity to CH₄ and current density, and the overpotentials for CH₄ is much lower. The excellent combination of the MOF cathodes and ILs opens a way for reduction of CO₂ to CH₄ effectively.

SUBMITTER: Kang X

PROVIDER: S-EPMC5952524 | biostudies-literature | 2016 Jan

REPOSITORIES: biostudies-literature

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Publications

Highly efficient electrochemical reduction of CO2 to CH4 in an ionic liquid using a metal-organic framework cathode.

Kang Xinchen X Zhu Qinggong Q Sun Xiaofu X Hu Jiayin J Zhang Jianling J Liu Zhimin Z Han Buxing B

Chemical science 20151002 1

Highly efficient electrochemical reduction of CO2 to CH4 is of great importance, but is challenging. Herein, Zn-1,3,5-benzenetricarboxylic acid metal-organic frameworks (Zn-BTC MOFs) deposited on carbon paper (CP) were used as cathodes in electrochemical reduction of CO2 using ionic liquids (ILs) as the electrolytes, which was the first work on combination of a MOF electrode and an pure IL electrolyte in the electrochemical reduction of CO2. It was fou ...[more]

PMID: 29861981

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Project description:Global warming is arguably the biggest scientific challenge of the twenty-first century and its environmental consequences are already noticeable. To mitigate the emissions of greenhouse gases, particularly of CO2, there is an urgent need to design materials with improved adsorbent properties. Five different magnetic ionic liquids were impregnated into the metal-organic framework ZIF-8. The composites were produced by a direct-contact method, and their performance as sorbents for gas separation applications was studied. The impact of the ionic liquid anion on the sorption capacity and ideal CO2/CH4 and CO2/N2 selectivities were studied, focusing on understanding the influence of metal atom and ligand on the adsorbent properties. Reproducible methodology, along with rigorous characterization, were established to assess the impact of the ionic liquid on the performance of the composite materials. Results show that the ionic liquid was well-impregnated, and the ZIF-8 structure was maintained after ionic liquid impregnation. The produced composites were of microporous nature and were thermally stable. CO2, CH4, and N2 adsorption-desorption isotherms were obtained at 303 K and between 0 and 16 bar. The adsorption-desorption data of the composites were compared with that obtained for original ZIF-8. The general trend in composites is that the increased gas uptake per available pore volume compensates the pore volume loss. Adsorption data per unit mass showed that composites have reversible sorption, but inferior gas uptake at all pressure ranges. This is due to the observed total pore volume loss by the ionic liquid pore occupation/blockage. In most cases, composites showed superior selectivity performance at all pressure range. In particular, the composite [C4MIM]2[MnCl4]@ZIF-8 shows a different low-pressure selectivity trend from the original MOF, with a 33% increase in the CO2/N2 selectivity at 1 bar and 19% increase in the CO2/CH4 selectivity at 10 bar. This material shows potential for use in a post-combustion CO2 capture application that can contribute to greenhouse gas mitigation.

Dataset Information

Highly efficient electrochemical reduction of CO₂ to CH₄ in an ionic liquid using a metal-organic framework cathode.

Publications

Highly efficient electrochemical reduction of CO<sub>2</sub> to CH<sub>4</sub> in an ionic liquid using a metal-organic framework cathode.

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