Direct Chemical Synthesis of MnO2 Nanowhiskers on Transition-Metal Carbide Surfaces for Supercapacitor Applications

Raghavan Baby Rakhi, Bilal Ahmed, Dalaver Anjum, Husam N. Alshareef

Research output: Contribution to journalArticlepeer-review

354 Scopus citations

Abstract

Transition-metal carbides (MXenes) are an emerging class of two-dimensional materials with promising electrochemical energy storage performance. Herein, for the first time, by direct chemical synthesis, nanocrystalline ϵ-MnO2 whiskers were formed on MXene nanosheet surfaces (ϵ-MnO2/Ti2CTx and ϵ-MnO2/Ti3C2Tx) to make nanocomposite electrodes for aqueous pseudocapacitors. The ϵ-MnO2 nanowhiskers increase the surface area of the composite electrode and enhance the specific capacitance by nearly 3 orders of magnitude compared to that of pure MXene-based symmetric supercapacitors. Combined with enhanced pseudocapacitance, the fabricated ϵ-MnO2/MXene supercapacitors exhibited excellent cycling stability with ∼88% of the initial specific capacitance retained after 10000 cycles which is much higher than pure ϵ-MnO2-based supercapacitors (∼74%). The proposed electrode structure capitalizes on the high specific capacitance of MnO2 and the ability of MXenes to improve conductivity and cycling stability.

Original languageBritish English
Pages (from-to)18806-18814
Number of pages9
JournalACS Applied Materials and Interfaces
Volume8
Issue number29
DOIs
StatePublished - 27 Jul 2016

Keywords

  • cycle life
  • MXene
  • specific capacitance
  • symmetric supercapacitor
  • ϵ-MnO/MXene

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