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

Happiness V. Ijije, Richard C. Lawrence, Nancy J. Siambun, Sang Mun Jeong, Daniel A. Jewell, Di Hu, George Z. Chen

Research output: Journal PublicationArticlepeer-review

61 Citations (Scopus)

Abstract

The electrochemical deposition and re-oxidation of solid carbon were studied in CO32- 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 CO32- 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.

Original languageEnglish
Pages (from-to)105-116
Number of pages12
JournalFaraday Discussions
Volume172
DOIs
Publication statusPublished - 17 Dec 2014
Externally publishedYes

ASJC Scopus subject areas

  • Medicine (all)

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