Synthesis of magnesium chloride complex electrolyte: Galvanic couple assisted catalytic dissolution of magnesium in ethereal solution

Jung Hoon Ha, Jinwon Cho, Jong Hak Kim, Byung Won Cho, Hyung Chul Ham, Si Hyoung Oh

Research output: Contribution to journalArticle

Abstract

Herein, we reveal the critical role of CrCl3 and the mechanism for the synthesis of magnesium chloride complex (MaCC), an advanced conditioning-free electrolyte for rechargeable magnesium batteries. This involves a catalytic dissolution of Mg metal by nanoscale bimetallic galvanic couples in an ethereal solution: At the initial stage, nanoscale amorphous Cr-rich ‘islands’ form on Mg surface, creating numerous Cr-Mg galvanic couples. These Cr-rich islands act as local cathodic sites due to partial electron transfer from Mg metal substrate. Furthermore, the first-principles calculation shows that Al prefers to bind at Cr-rich regions rather than Mg. These trigger a heterogeneous catalysis for the selective deposition of Al on Cr-rich islands and a dramatic increase in the dissolution rate of Mg metal on the neighboring region. This leads to an ultrahigh Mg2+-to-Al3+ concentration ratio in the resultant solution, a key property of the conditioning-free electrolyte. This study is potentially applicable to many other fields like metal-air batteries and corrosion protection of metals, where a subtle manipulation of passive layer is required.

Original languageEnglish
Pages (from-to)120-127
Number of pages8
JournalJournal of Power Sources
Volume398
DOIs
Publication statusPublished - 2018 Sep 15

Fingerprint

magnesium chlorides
Magnesium Chloride
Magnesium
Electrolytes
magnesium
dissolving
Dissolution
Metals
electrolytes
synthesis
conditioning
metals
metal air batteries
catalysis
electric batteries
Corrosion protection
manipulators
corrosion
electron transfer
actuators

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

Ha, Jung Hoon ; Cho, Jinwon ; Kim, Jong Hak ; Cho, Byung Won ; Ham, Hyung Chul ; Oh, Si Hyoung. / Synthesis of magnesium chloride complex electrolyte : Galvanic couple assisted catalytic dissolution of magnesium in ethereal solution. In: Journal of Power Sources. 2018 ; Vol. 398. pp. 120-127.
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Synthesis of magnesium chloride complex electrolyte : Galvanic couple assisted catalytic dissolution of magnesium in ethereal solution. / Ha, Jung Hoon; Cho, Jinwon; Kim, Jong Hak; Cho, Byung Won; Ham, Hyung Chul; Oh, Si Hyoung.

In: Journal of Power Sources, Vol. 398, 15.09.2018, p. 120-127.

Research output: Contribution to journalArticle

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