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Title: Interlayer structure engineering of mxene-based capacitor-type electrode for hybrid micro-supercapacitor toward battery-level energy density
Authors: Cheng, W
Fu, J 
Hu, H
Ho, D
Issue Date: Aug-2021
Source: Advanced science, 18 Aug. 2021, v. 8, no. 16, 2100775
Abstract: Micro-supercapacitors are notorious for their low energy densities compared to micro-batteries. While MXenes have been identified as promising capacitor-type electrode materials for alternative zinc-ion hybrid micro-supercapacitors (ZHMSCs) with higher energy density, their tightly spaced layered structure renders multivalent zinc-ions with large radii intercalation inefficient. Herein, through insertion of 1D core-shell conductive BC@PPy nanofibers between MXene nanosheets, an interlayer structure engineering technique for MXene/BC@PPy capacitor-type electrodes towards ZHMSCs is presented. Owing to simultaneously achieving two objectives: (i) widening the interlayer space and (ii) providing conductive connections between the loose MXene layers, enabled by the conductive BC@PPy nanospacer, the approach effectively enhances both ion and electron transport within the layered MXene structure, significantly increasing the areal capacitance of the MXene/BC@PPy film electrode to 388 mF cm−2, which is a 10-fold improvement from the pure MXene film electrode. Pairing with CNTs/MnO2 battery-type electrodes, the obtained ZHMSCs exhibit an areal energy density up to 145.4 μWh cm−2 with an outstanding 95.8% capacity retention after 25000 cycles, which is the highest among recently reported MXene-based MSCs and approaches the level of micro-batteries. The interlayer structure engineering demonstrated in the MXene-based capacitor-type electrode provides a rational means to achieve battery-levelenergy density in the ZHMSCs.
Keywords: Capacitor-type anodes
Hybrid micro-supercapacitors
Interlayer engineering
MXene
Zn2+ transfer kinetics
Publisher: Wiley-VCH
Journal: Advanced science 
ISSN: 2198-3844
DOI: 10.1002/advs.202100775
Rights: © 2021 The Authors. Advanced Science published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cite.
The following publication Cheng, W., Fu, J., Hu, H., & Ho, D. (2021). Interlayer Structure Engineering of MXene‐Based Capacitor‐Type Electrode for Hybrid Micro‐Supercapacitor toward Battery‐Level Energy Density. Advanced Science, 2100775 is available at https://doi.org/10.1002/advs.202100775
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