Electro-deposition and re-oxidation of carbon in carbonate containing molten salts

Happiness V. Ijije, and Richard C. Lawrence, and Nancy Julius Siambun, and Sang, Mun Jeong and Daniel A. Jewell, and Di, Hu and Chen, George Zheng (2014) Electro-deposition and re-oxidation of carbon in carbonate containing molten salts. Faraday Discussions, 172. pp. 105-116. ISSN 1359-6640

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Abstract

The electrochemical deposition and re-oxidation of solid carbon were studied in CO3(2-) ion-containing molten salts (e.g. CaCl2-CaCO3-LiCl-KCl and Li2CO3-K2CO3) at temperatures between 500 and 800 °C under Ar, CO2 or N2-CO2 atmospheres. The electrode reactions were investigated by thermodynamic analysis, cyclic voltammetry and chronopotentiometry in a three-electrode cell under various conditions. The findings suggest that the electro-reduction of CO3(2-) is dominated by carbon deposition on all three tested working electrodes (Ni, Pt and mild steel), but partial reduction to CO can also occur. Electro-re-oxidation of the deposited carbon in the same molten salts was investigated for potential applications in, for example, direct carbon fuel cells. A brief energy and cost analysis is given based on results from constant voltage electrolysis in a two-electrode cell.

Item Type: Article
Uncontrolled Keywords: electrochemical deposition, re-oxidation, solid carbon, molten salts, thermodynamic analysis
Subjects: Q Science > QD Chemistry
Divisions: FACULTY > Faculty of Engineering
Depositing User: Munira
Date Deposited: 23 Mar 2018 08:18
Last Modified: 23 Mar 2018 08:18
URI: http://eprints.ums.edu.my/id/eprint/19472

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