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Indirect electrochemical reduction of carbon dioxide to carbon nanopowders in molten alkali carbonates: Process variables and product properties

Ijije, Happiness V.; Sun, Chenggong; Chen, George Z.

Authors

Happiness V. Ijije

Chenggong Sun

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GEORGE CHEN GEORGE.CHEN@NOTTINGHAM.AC.UK
Professor of Electrochemical Technologies



Abstract

Carbon was deposited on a mild steel cathode during electrolysis in the molten mixture of Li2CO3 and K2CO3 (mole ratio: 62:38) under CO2 or mixed N2 and CO2 atmospheres at 3.0–5.0 V and 540–700 °C. In a three-electrode cell, cyclic voltammetry was applied on a platinum working electrode to study the reduction and deposition processes. A two-electrode cell helped correlate electrolysis variables, e.g. temperature and voltage, with the deposition rate, current efficiency, and properties of the deposited carbon powders. High current efficiency (>90%) and deposition rate (>0.11 g cm−2 h−1) were achieved in the study. Elemental analysis of the electro-deposits, following washing with HCl solutions (2.3–7.8 mol L−1), showed carbon as the dominant element (75–95 wt.%) plus oxygen (5–10 wt.%) and small amounts of other elements related to materials of the electrolytic cell. Thermogravimetry detected fairly low onset combustion temperatures (310–430 °C), depending on the electrolysis and acid washing conditions. Amorphous and various nanostructures (sheet, rings and quasi-spheres) were revealed by electron microscopy in carbon samples deposited under different process conditions. The specific surface area of the carbon deposited at 5.0 V and 540 °C was as high as 585 m2 g−1. An analysis of the energy consumption suggests several ways for efficiency improvement so that the electrolytic carbon from CO2 will become commercially attractive.

Journal Article Type Article
Publication Date 2014-07
Journal Carbon
Print ISSN 0008-6223
Electronic ISSN 0008-6223
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 73
Pages 163-174
APA6 Citation Ijije, H. V., Sun, C., & Chen, G. Z. (2014). Indirect electrochemical reduction of carbon dioxide to carbon nanopowders in molten alkali carbonates: Process variables and product properties. Carbon, 73, 163-174. https://doi.org/10.1016/j.carbon.2014.02.052
DOI https://doi.org/10.1016/j.carbon.2014.02.052
Keywords Carbon; carbon dioxide; electrolysis; molten salts
Publisher URL http://dx.doi.org/10.1016/j.carbon.2014.02.052
Related Public URLs http://dx.doi.org/10.1016/j.carbon.2014.02.052
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This article is maintained by: Elsevier; Article Title: Indirect electrochemical reduction of carbon dioxide to carbon nanopowders in molten alkali carbonates: Process variables and product properties; Journal Title: Carbon; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.carbon.2014.02.052; Content Type: article; Copyright: Copyright © 2014 Elsevier Ltd. All rights reserved.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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