3D-structured bifunctional MXene paper electrodes for protection and activation of Al metal anodes

Yeong Hoon Heo, Juyun Lee, Son Ha, Jong Chan Hyun, Dong Hyuk Kang, Juhee Yoon, Hyun Soo Kim, Yeonhua Choi, Yun Chan Kang, Hyoung Joon Jin, Seon Joon Kim, Young Soo Yun

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Multivalent Al metal anodes (AMAs) can deliver high specific/volumetric capacities (2980 mA h g−1/8046 mA h cm−3) in chloroaluminate ionic liquid-based electrolytes (ILEs). However, strong corrosion of their surfaces and poor charge transfer kinetics in acidic ILEs remain critical obstacles to realizing high-performance AMAs. In this study, a 3D-structured bifunctional MXene paper electrode (3D-BMPE), which has distinctive material properties, such as high electrical conductivity, high elastic modulus, a large number of nanopores, and multitudinous oxygen functional groups, was fabricated to protect Al deposition/dissolution reactions with improved redox kinetics. The 3D-BMPE obstructed Al corrosion during the long rest time in the ILE and consecutive cycling process, resulting in a significantly stable cycling performance of the 3D-BMPE-based AMA over 2000 cycles. Furthermore, Al nucleation and growth reactions were catalyzed in the nanoporous structure surrounded by the highly functionalized MXene surfaces, which reduced overpotentials by one-sixth, resulting in highly improved coulombic efficiencies of ∼99.9%. Moreover, the excellent electrochemical performance of the 3D-BMPE-based AMA was confirmed in Al-based dual-ion battery full cells, demonstrating the significant role played by 3D-BMPEs for AMAs.

Original languageEnglish
Pages (from-to)14380-14389
Number of pages10
JournalJournal of Materials Chemistry A
Volume11
Issue number26
DOIs
Publication statusPublished - 2023 Jun 21

Bibliographical note

Publisher Copyright:
© 2023 The Royal Society of Chemistry.

ASJC Scopus subject areas

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

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