Journal
FARADAY DISCUSSIONS
Volume 172, Issue -, Pages 105-116Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4fd00046c
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Funding
- Royal Society
- EPSRC [EP/F026412/1, EP/J000582/1]
- University of Nottingham
- Engineering and Physical Sciences Research Council [EP/F026412/1, EP/J000582/1] Funding Source: researchfish
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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 degrees C under Ar, CO2 or N-2-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.
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