Morphology-controllable bimetallic MOFs/textile composite electrodes with high areal capacitance for flexible electronic devices

A new strategy has been designed for enhancing the electrochemical performances of supercapacitor electrodes. In this work, flexible hetero-structure conductive cotton equipped with lamellar structure nickel/cobalt-based MOFs (NiCo-MOFs) is prepared through a self-sacrificial template method. The in...

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Bibliographic Details
Published in:Materials chemistry frontiers 2023-03, Vol.7 (7), p.1411-1422
Main Authors: Zhai, Shixiong, Jin, Zhendong, Li, Chengcheng, Sun, JiaFeng, Zhao, Hong, Jin, Zhehai, Cai, Zaisheng, Zhao, Yaping
Format: Article
Language:English
Subjects:
Bimetals
Charge transfer
Controllability
Cotton
Electrodes
Electronic devices
Energy storage
Intermetallic compounds
Lamellar structure
Morphology
Supercapacitors
Textile composites
Textiles
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Summary:A new strategy has been designed for enhancing the electrochemical performances of supercapacitor electrodes. In this work, flexible hetero-structure conductive cotton equipped with lamellar structure nickel/cobalt-based MOFs (NiCo-MOFs) is prepared through a self-sacrificial template method. The in situ conversion measure effectively strengthens the binding forces between the active materials and the current collector, which decreases the charge transfer resistance at the electrode-electrolyte interfaces. Morphological modulation of the NiCo-MOFs is carried out to construct fast transport channels for ions and charges during the charging-discharging process. The optimized NiC/NiCoMOF21 is composed of uniformly dispersed nanosheets with large gaps, which can provide more free space and active sites for electrode reactions. The energy density of the asymmetric supercapacitor (carbon cloth as the negative electrode) reaches 0.38 mW h cm −2 at 1.6 mW cm −2 (16.7% loss of the initial capacity after 2000 cycles), which overcomes the low energy storage performance of the existing textile-based electrodes. A new strategy has been designed for enhancing the electrochemical performances of supercapacitor electrodes.
ISSN:2052-1537
2052-1537
DOI:10.1039/d2qm00126h