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Research Article

Ionic liquid-wrapped MXene film with bowl-like structures for highly integrated micro-supercapacitor array with ultrahigh output voltage

Cai-Yun Ren1, Sheng-You Qiu2, Jing-Ru Zhai3, Ke-Qi Zhang1, Jia-Xing Lu1, Jian Gao1( ), Chuang Wang2, Yong-Chao Zhang1, Xiao-Dong Zhu1( )
State Key Laboratory Base of Eco-Chemical Engineering, Institute of Chemical Technology, Qingdao University of Science & Technology, Qingdao 266042, China
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150080, China
School of Materials, Sun Yat-sen University, Shenzhen 518107, China
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Graphical Abstract

The high-energy micro-supercapacitor (MSC) based on MXene-ionic liquid (IL) film with bowl-like structures is fabricated. The ionic liquid as spacer and electrolyte is retained in the interlamination of MXene-IL film in virtue of MXene-TW20-IL (TW20 = tween-20) microemulsion, enlarging ion-accessible surface area and voltage window of MXene electrode. Customizable integrated designs of MSC array fulfill the requirements of microelectronic devices for energy and voltage.

Abstract

Recent researches in the development of in-plane micro-supercapacitor (MSC) have been dedicated to advancing its energy density in a finite storage area. However, the low ion-accessible surface area of plane electrode material has been the bottleneck limiting the energy output of MSC. Herein, we design a stable ionic liquid (IL)-MXene microemulsion system in virtue of tween-20 (TW20), gathering IL-TW20 microdroplets around MXene nanosheets. The microemulsion can adhere on the current collector and form the dense MXene-TW20-IL film. The IL as spacer and electrolyte is retained in the interlamination of MXene with the elimination of the TW20 during heat treatment, which enlarges the ion-accessible surface area of the MXene electrode. Thus, the MSC based on the flexible MXene-IL film exhibits a high areal capacitance (44.6 mF·cm−2), a high areal and volumetric energy density (50.7 μW·h·cm−2 and 39 mW·h·cm−3), surpassing most of the reported MXene-based MSCs. And the MSC unit can be arbitrarily integrated in terms of various energy and voltage requirements. For instance, the integrated array with thirty MSC units in series realizes a high voltage output of 90 V, widening the range of application in next-generation microelectronic devices.

Keywords

microemulsion systemionic liquid-wrapped MXene filmsmicro-supercapacitorsextra-high voltageintegration

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Nano Research
Volume 16 Issue 4,
April 2023
Pages 4926-4932
DOI: 10.1007/s12274-022-5098-4
Cite this article:
Ren C-Y, Qiu S-Y, Zhai J-R, et al. Ionic liquid-wrapped MXene film with bowl-like structures for highly integrated micro-supercapacitor array with ultrahigh output voltage. Nano Research, 2023, 16(4): 4926-4932. https://doi.org/10.1007/s12274-022-5098-4
Topics:
Supercapacitor

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Received: 16 July 2022
Revised: 06 September 2022
Accepted: 24 September 2022
Published: 28 October 2022
© Tsinghua University Press 2022
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