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

doi:10.1039/c4fd00046c

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

Department of Chemical and Environmental Engineering

Research output: Journal Publication › Article › peer-review

80 Citations (Scopus)

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.

Original language	English
Pages (from-to)	105-116
Number of pages	12
Journal	Faraday Discussions
Volume	172
DOIs	https://doi.org/10.1039/c4fd00046c
Publication status	Published - 17 Dec 2014

ASJC Scopus subject areas

General Medicine

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1039/c4fd00046c

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title = "Electro-deposition and re-oxidation of carbon in carbonate-containing molten salts",

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.",

author = "Ijije, {Happiness V.} and Lawrence, {Richard C.} and Siambun, {Nancy J.} and Jeong, {Sang Mun} and Jewell, {Daniel A.} and Di Hu and Chen, {George Z.}",

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doi = "10.1039/c4fd00046c",

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T1 - Electro-deposition and re-oxidation of carbon in carbonate-containing molten salts

AU - Ijije, Happiness V.

AU - Lawrence, Richard C.

AU - Siambun, Nancy J.

AU - Jeong, Sang Mun

AU - Jewell, Daniel A.

AU - Hu, Di

AU - Chen, George Z.

PY - 2014/12/17

Y1 - 2014/12/17

N2 - 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.

AB - 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.

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JO - Faraday Discussions

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ER -

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

Abstract

ASJC Scopus subject areas

UN SDGs

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