Direct chemical synthesis of MnO2 nanowhiskers on MXene surfaces for supercapacitor applications

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

Research output: Contribution to journalArticlepeer-review

184 Scopus citations

Abstract

Transition metal carbides (MXenes) are an emerging class of two dimensional (2D) 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 three orders of magnitude compared to 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 languageEnglish (US)
Pages (from-to)18806-18814
Number of pages9
JournalACS Applied Materials & Interfaces
Volume8
Issue number29
DOIs
StatePublished - Jul 14 2016

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