All-MXene (2D titanium carbide) solid-state microsupercapacitors for on-chip energy storage

You-Yu Peng, Bilen Akuzum, Narendra Kurra, Meng-Qiang Zhao, Mohamed Alhabeb, Babak Anasori, Emin Caglan Kumbur, Husam N. Alshareef, Ming-Der Ger, Yury Gogotsi

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549 Scopus citations

Abstract

On-chip energy storage is a rapidly evolving research topic, opening doors for integration of batteries and supercapacitors at microscales on rigid and flexible platforms. Recently, a new class of two-dimensional (2D) transition metal carbides and nitrides (so-called MXenes) has shown great promise in electrochemical energy storage applications. Here, we report the fabrication of all-MXene (Ti3C2Tx) solid-state interdigital microsupercapacitors by employing a solution spray-coating, followed by a photoresist-free direct laser cutting method. Our prototype devices consisted of two layers of Ti3C2Tx with two different flake sizes. The bottom layer was stacked large-size MXene flakes (typical lateral dimensions of 3-6 μm) serving mainly as current collectors. The top layer was made of small-size MXene flakes (~1 μm) with a large number of defects and edges as the electroactive layer responsible for energy storage. Compared to Ti3C2Tx micro-supercapacitors with platinum current collectors, the all-MXene devices exhibited much lower contact resistance, higher capacitances and better rate-capabilities. The areal and volumetric capacitances of ~27 mF cm-2 and ~337 F cm-3, respectively, at a scan rate of 20 mV s-1 were achieved. The devices also demonstrated their excellent cyclic stability, with 100% capacitance retention after 10,000 cycles at a scan rate of 50 mV s-1. This study opens up a plethora of possible designs for high-performance on-chip devices employing different chemistries, flake sizes and morphologies of MXenes and their heterostructures.
Original languageEnglish (US)
Pages (from-to)2847-2854
Number of pages8
JournalEnergy Environ. Sci.
Volume9
Issue number9
DOIs
StatePublished - 2016

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the Fluid Interface Reactions,
Structures and Transport (FIRST) Center, an Energy Frontier
Research Center funded by the U.S. Department of Energy,
Office of Science, and Office of Basic Energy Sciences. YP was
supported by Ministry of Science and Technology of Taiwan
under grants No. 104-2917-I-606-001. The authors wish to
thank Professor James Tangorra at Drexel University for their
assistance and use of their laser cutter, and Professor Adam
Fontecchio for use of their Profilometer. XRD, SEM, and TEM
investigations were performed at the Centralized Research
Facilities (CRF) at Drexel University.

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