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Journal of Colloid and Interface Science

Journal of Colloid and Interface Science

IF: 9.4
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High-performance aqueous zinc-ion hybrid micro-supercapacitors enabled by oxygen-rich functionalised MXene nanofibres

Published:7 December 2024 DOI: 10.1016/j.jcis.2024.12.038 PMID: 39667328
Yamin Feng,?Weifeng Liu,?Haineng Bai,?Yan Zhang,?Yunxiao Du,?Yongqiang Liu,?Long Zhang

Abstract

Aqueous zinc-ion hybrid micro-supercapacitors (AZIHMSCs) with high power density, moderate energy density, good cycle life and excellent safety are promising candidates for micro-energy storage. Among them, AZIHMSCs based on Ti3C2Tx MXene anodes and battery-type cathodes can provide superior performance. However, two-dimensional (2D) Ti3C2Tx MXene electrodes have an inherent restacking issue and -F surface terminations that hinder ion diffusion and ultimately reduce the energy storage capacity of the corresponding AZIHMSCs. Herein, a deep alkalisation strategy was developed to synthesise oxygen-rich, functionalised MXene (O-MXene) nanofibres to solve these problems. Compared with the traditional 2D few-layered Ti3C2Tx MXene electrode, O-MXene electrodes exhibit an interconnected, three-dimensional (3D) microstructure and ample oxygen functional groups, enhancing Zn2+ affinity and improving capacitance and rate performance. First-principles calculations further reveal the enhanced interactions between O-MXene electrodes and Zn2+ supported by atomic interaction, electronic behaviour and orbital hybridization. The AZIHMSCs fabricated with an O-MXene film anode and a MnO2-multiwalled carbon nanotubes (MnO2-MWCNTs) film cathode exhibit excellent energy density (130.6 μWh cm-2), power density (9.5 mW cm-2), cycling stability (93.29?% after 5000 cycles) and flexibility (98.43?% capacitance retained at 120° bending). This study will open new avenues for modifying MXene materials and next-generation high-performance AZIHMSCs.

Substances (6)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Sodium dodecyl sulfate 151-21-3 C12H25NaO4S 1118 suppliers $6.00-$3140.00
Potassium hydroxide 1310-58-3 KOH 747 suppliers $10.00-$7430.00
Acrylamide 79-06-1 C3H5NO 665 suppliers $18.00-$1470.00
Potassium persulfate 7727-21-1 K2O8S2 441 suppliers $10.00-$550.00
Manganese(II) sulfate monohydrate 10034-96-5 H2MnO5S 419 suppliers $6.00-$5340.00
Ti3AlC2 196506-01-1 CH7AlTi 56 suppliers Inquiry

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