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Issue 9, 2016
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All-MXene (2D titanium carbide) solid-state microsupercapacitors for on-chip energy storage

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Abstract

On-chip energy storage is a rapidly evolving research topic, opening doors for the integration of batteries and supercapacitors at the microscale 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 method, 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 (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 a much lower contact resistance, higher capacitances and better rate-capabilities. Areal and volumetric capacitances of ∼27 mF cm−2 and ∼357 F cm−3, respectively, at a scan rate of 20 mV s−1 were achieved. The devices also demonstrated 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.

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

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Publication details

The article was received on 14 Jun 2016, accepted on 01 Aug 2016 and first published on 01 Aug 2016


Article type: Paper
DOI: 10.1039/C6EE01717G
Energy Environ. Sci., 2016,9, 2847-2854

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

    Y. Peng, B. Akuzum, N. Kurra, M. Zhao, M. Alhabeb, B. Anasori, E. C. Kumbur, H. N. Alshareef, M. Ger and Y. Gogotsi, Energy Environ. Sci., 2016, 9, 2847
    DOI: 10.1039/C6EE01717G

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