A Symmetric Aqueous Magnesium Ion Supercapattery Based on Covalent Organic Frameworks

Guodong Zou, Zhengnan Tian, Vinayak S. Kale, Wenxi Wang, Sharath Kandembeth, Zhen Cao, Jing Guo, Justyna Czaban-Jóźwiak, Luigi Cavallo, Osama Shekhah, Mohamed Eddaoudi*, Husam N. Alshareef*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Aqueous magnesium ion-based batteries have attracted significant research interest due to the two-electron transfer process, small cation radius, low reduction potential as well as the inert hydrogen evolution reaction. However, the high surface charge density of divalent Mg2+ ions results in sluggish solid-state diffusion kinetics, which significantly limits the number of host materials suitable for effective Mg2+ ion storage. Here, for the first time, covalent organic frameworks (COFs) are explored as host materials for high-rate aqueous Mg2+ ion batteries. Combining electrochemical and spectral characterization with theoretical simulation, a synergistic charge storage mechanism involving the reaction of nitrogen and oxygen bridged by Mg2+ ions is revealed. Using electrochemical analysis, it is shown that the Mg2+ ion diffusion kinetics are dominated by the surface pseudocapacitive behavior in COFs, which achieves a favorable rate performance and durable cyclic stability. This work offers a new perspective on the storage of Mg2+ ions in COF host materials.

Original languageEnglish (US)
Article number2203193
JournalAdvanced Energy Materials
Volume13
Issue number7
DOIs
StatePublished - Feb 17 2023

Keywords

  • aqueous batteries
  • covalent organic frameworks
  • Mg ion batteries

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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