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 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 Chen^*

^*Corresponding author for this work

Research output: Journal Publication › Article › peer-review

95 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

UN SDGs

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

SDG 7 Affordable and Clean Energy

ASJC Scopus subject areas

General Medicine

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10.1039/c4fd00046c

Cite this

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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 George Chen",

note = "Publisher Copyright: {\textcopyright} The Royal Society of Chemistry 2014.",

year = "2014",

month = dec,

day = "17",

doi = "10.1039/c4fd00046c",

language = "English",

volume = "172",

pages = "105--116",

journal = "Faraday Discussions",

issn = "1359-6640",

publisher = "Royal Society of Chemistry",

}

TY - JOUR

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

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.

UR - https://www.scopus.com/pages/publications/84914665014

U2 - 10.1039/c4fd00046c

DO - 10.1039/c4fd00046c

M3 - Article

AN - SCOPUS:84914665014

SN - 1359-6640

VL - 172

SP - 105

EP - 116

JO - Faraday Discussions

JF - Faraday Discussions

ER -

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

Abstract

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ASJC Scopus subject areas

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