Metal Cation Pre-Intercalated Ti3C2TxMXene as Ultra-High Areal Capacitance Electrodes for Aqueous Supercapacitors

Kaitlyn Prenger, Yangunli Sun, Karthik Ganeshan, Ameer Al-Temimy, Kun Liang, Chaochao Dun, Jeffrey J. Urban, Jie Xiao, Tristan Petit, Adri C.T. Van Duin, De En Jiang, Michael Naguib

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Two-dimensional transition-metal carbides and nitrides "MXenes" have demonstrated great potential as electrode materials for electrochemical energy storage systems. This is especially true for delaminated Ti3C2Tx, which already shows outstanding gravimetric and volumetric capacitance, with areal capacitance limited by thickness (only a few microns). However, the performance of multilayer Ti3C2Txhas been more modest. Here, we report on using metal cation (viz., Na+, K+, and Mg2+) pre-intercalated multilayer Ti3C2Txas electrodes for aqueous supercapacitors. These electrodes are scalable and amenable to roll-to-roll manufacturing, with adjustable areal loadings of 5.2 to 20.1 mg/cm2. K-Ti3C2Txexhibited the highest capacitances at different scan rates. A gravimetric capacitance comparable to that of delaminated MXene of up to 300 F/g was achieved for multilayer K-Ti3C2Txbut with an outstanding ultra-high areal capacitance of up to 5.7 F/cm2, which is 10-fold higher than the 0.5 F/cm2of delaminated MXene and exceeds the 4.0 F/cm2of microengineered MXene electrodes.

Original languageEnglish (US)
Pages (from-to)9373-9382
Number of pages10
JournalACS Applied Energy Materials
Volume5
Issue number8
DOIs
StatePublished - Aug 22 2022

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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