Electrochemical cycling of Mg in Mg[TFSI]2/tetraglyme electrolytes

Zheng Ma; Mega Kar; Changlong Xiao; Maria Forsyth; Douglas R. MacFarlane

doi:10.1016/j.elecom.2017.03.018

Electrochemical cycling of Mg in Mg[TFSI]₂/tetraglyme electrolytes

Zheng Ma, Mega Kar, Changlong Xiao, Maria Forsyth, Douglas R. MacFarlane

School of Chemistry

Research output: Contribution to journal › Article › Research › peer-review

25 Citations (Scopus)

Abstract

The electrochemical reversibility of magnesium was observed in an electrolyte consisting of 0.5 M Mg[TFSI]₂ in tetraglyme in the presence of a small amount of Mg[BH₄]₂. The cyclic efficiency of the cathodic/anodic process was found to increase initially with [BH₄]⁻ then plateau at about 75% beyond 6 mM in these experiments. This concentration is in the region of that indicated by Karl Fischer analysis of the electrolyte as required of [BH₄]⁻ as a dehydrating agent. Cyclic voltammetry showed the reduction onset potential at approximately − 0.35 V vs. Mg and subsequent oxidation around 0 V vs. Mg. Stable cyclic efficiency of approximately 75% over 500 cycles is demonstrated on a platinum substrate. Mg cycling on magnesium, copper and aluminium substrates all show stable cycling over 500 cycles with cyclic efficiency > 73%.

Original language	English
Pages (from-to)	29-32
Number of pages	4
Journal	Electrochemistry Communications
Volume	78
DOIs	https://doi.org/10.1016/j.elecom.2017.03.018
Publication status	Published - 1 May 2017

Keywords

Mg electrochemistry
Mg[BH]
Mg[TFSI]
Tetraglyme

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10.1016/j.elecom.2017.03.018

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Cite this

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title = "Electrochemical cycling of Mg in Mg[TFSI]2/tetraglyme electrolytes",

abstract = "The electrochemical reversibility of magnesium was observed in an electrolyte consisting of 0.5 M Mg[TFSI]2 in tetraglyme in the presence of a small amount of Mg[BH4]2. The cyclic efficiency of the cathodic/anodic process was found to increase initially with [BH4]− then plateau at about 75% beyond 6 mM in these experiments. This concentration is in the region of that indicated by Karl Fischer analysis of the electrolyte as required of [BH4]− as a dehydrating agent. Cyclic voltammetry showed the reduction onset potential at approximately − 0.35 V vs. Mg and subsequent oxidation around 0 V vs. Mg. Stable cyclic efficiency of approximately 75% over 500 cycles is demonstrated on a platinum substrate. Mg cycling on magnesium, copper and aluminium substrates all show stable cycling over 500 cycles with cyclic efficiency > 73%.",

keywords = "Mg electrochemistry, Mg[BH], Mg[TFSI], Tetraglyme",

author = "Zheng Ma and Mega Kar and Changlong Xiao and Maria Forsyth and MacFarlane, {Douglas R.}",

year = "2017",

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TY - JOUR

T1 - Electrochemical cycling of Mg in Mg[TFSI]2/tetraglyme electrolytes

AU - Ma, Zheng

AU - Kar, Mega

AU - Xiao, Changlong

AU - Forsyth, Maria

AU - MacFarlane, Douglas R.

PY - 2017/5/1

Y1 - 2017/5/1

N2 - The electrochemical reversibility of magnesium was observed in an electrolyte consisting of 0.5 M Mg[TFSI]2 in tetraglyme in the presence of a small amount of Mg[BH4]2. The cyclic efficiency of the cathodic/anodic process was found to increase initially with [BH4]− then plateau at about 75% beyond 6 mM in these experiments. This concentration is in the region of that indicated by Karl Fischer analysis of the electrolyte as required of [BH4]− as a dehydrating agent. Cyclic voltammetry showed the reduction onset potential at approximately − 0.35 V vs. Mg and subsequent oxidation around 0 V vs. Mg. Stable cyclic efficiency of approximately 75% over 500 cycles is demonstrated on a platinum substrate. Mg cycling on magnesium, copper and aluminium substrates all show stable cycling over 500 cycles with cyclic efficiency > 73%.

AB - The electrochemical reversibility of magnesium was observed in an electrolyte consisting of 0.5 M Mg[TFSI]2 in tetraglyme in the presence of a small amount of Mg[BH4]2. The cyclic efficiency of the cathodic/anodic process was found to increase initially with [BH4]− then plateau at about 75% beyond 6 mM in these experiments. This concentration is in the region of that indicated by Karl Fischer analysis of the electrolyte as required of [BH4]− as a dehydrating agent. Cyclic voltammetry showed the reduction onset potential at approximately − 0.35 V vs. Mg and subsequent oxidation around 0 V vs. Mg. Stable cyclic efficiency of approximately 75% over 500 cycles is demonstrated on a platinum substrate. Mg cycling on magnesium, copper and aluminium substrates all show stable cycling over 500 cycles with cyclic efficiency > 73%.

KW - Mg electrochemistry

KW - Mg[BH]

KW - Mg[TFSI]

KW - Tetraglyme

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