Control of magnesium interfacial reactions in aqueous electrolytes towards a biocompatible battery

A stable magnesium battery has been developed based on a magnesium anode, a poly(dioxyethane thiophene) (PEDOT) cathode and a near-saturated aqueous solution of LiCl, MgCl 2, or mixture of these salts at pH of 11. This combination leads to a low water activity in the electrolyte, which thus suppress...

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Bibliographic Details
Published in:Electrochimica acta 2008-08, Vol.53 (20), p.5881-5884
Main Authors: Winther-Jensen, B., Gaadingwe, M., Macfarlane, D.R., Forsyth, M.
Format: Article
Language:English
Subjects:
Applied sciences
Aqueous electrolyte
Biocompatible battery
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
Mg passivation
Poly(3,4-ethylene dioxythiophene)
Primary battery
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Summary:A stable magnesium battery has been developed based on a magnesium anode, a poly(dioxyethane thiophene) (PEDOT) cathode and a near-saturated aqueous solution of LiCl, MgCl 2, or mixture of these salts at pH of 11. This combination leads to a low water activity in the electrolyte, which thus suppresses the hydrogen evolution reaction on Mg, as well as producing a stable oxy-hydroxide film which protects the metal surface from freely corroding. The conducting polymer cathode is reduced somewhat during the discharge process, however, appears to be readily re-oxidised (as determined from the resistance) by the oxygen present in the cell. The cell is therefore primarily a Mg/O 2 battery, however, the PEDOT appears to enhance the performance, in particular the discharge voltage.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2008.04.005