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Issue 16, 2019
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Ionic liquid pre-intercalated MXene films for ionogel-based flexible micro-supercapacitors with high volumetric energy density

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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

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Publication details

The article was received on 27 Feb 2019, accepted on 26 Mar 2019 and first published on 27 Mar 2019


Article type: Communication
DOI: 10.1039/C9TA02190F
J. Mater. Chem. A, 2019,7, 9478-9485

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    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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