Issue 16, 2019

Ionic liquid pre-intercalated MXene films for ionogel-based flexible micro-supercapacitors with high volumetric energy density

Abstract

MXenes are emerging as a very promising electrode material of high-performance micro-supercapacitors (MSCs) for microscale electronics. However, MXene based MSCs (M-MSCs) reported so far exhibit low areal (≤10 μW h cm−2) and volumetric (≤20 mW h cm−3) energy densities due to their narrow working voltage in aqueous systems (0.6–1.0 V). Herein, we report for the first time the construction of high-voltage and high-energy flexible ionogel-based M-MSCs with interdigital microelectrodes of ionic liquid pre-intercalated MXene films. Benefitting from the pre-intercalation of ionic liquid, the as-fabricated M-MSCs, working at 3 V in 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4), exhibited high areal and volumetric energy densities of 13.9 μW h cm−2 and 43.7 mW h cm−3, respectively, both of which are among the highest values for the reported M-MSCs. Moreover, all-solid-state M-MSCs using ionogel electrolytes displayed exceptional flexibility without capacitance loss under various deformation conditions and seamless integration free of metal-based interconnections for boosting voltage output. Therefore, such high-energy M-MSCs hold great potential for direct integration of flexible and miniature electronics.

Graphical abstract: Ionic liquid pre-intercalated MXene films for ionogel-based flexible micro-supercapacitors with high volumetric energy density

Supplementary files

Article information

Article type
Communication
Submitted
27 Febr. 2019
Accepted
26 Marts 2019
First published
27 Marts 2019

J. Mater. Chem. A, 2019,7, 9478-9485

Ionic liquid pre-intercalated MXene films for ionogel-based flexible micro-supercapacitors with high volumetric energy density

S. Zheng, C. (. Zhang, F. Zhou, Y. Dong, X. Shi, V. Nicolosi, Z. Wu and X. Bao, J. Mater. Chem. A, 2019, 7, 9478 DOI: 10.1039/C9TA02190F

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