Interlayer Structure Engineering of MXene-Based Capacitor-Type Electrode for Hybrid Micro-Supercapacitor toward Battery-Level Energy Density
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Article number | 2100775 |
Journal / Publication | Advanced Science |
Volume | 8 |
Issue number | 16 |
Online published | 17 Jun 2021 |
Publication status | Published - 18 Aug 2021 |
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DOI | DOI |
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Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-85108153975&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(d57c1e5b-ffd0-4dcc-b034-3f8992b1ef21).html |
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.
Research Area(s)
- capacitor-type anodes, hybrid micro-supercapacitors, interlayer engineering, MXene, Zn2+ transfer kinetics
Citation Format(s)
Interlayer Structure Engineering of MXene-Based Capacitor-Type Electrode for Hybrid Micro-Supercapacitor toward Battery-Level Energy Density. / Cheng, Wenxiang; Fu, Jimin; Hu, Haibo et al.
In: Advanced Science, Vol. 8, No. 16, 2100775, 18.08.2021.
In: Advanced Science, Vol. 8, No. 16, 2100775, 18.08.2021.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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