In situ nanoarchitecturing of conjugated polyamide network-derived carbon cathodes toward high energy-power Zn-ion capacitors
Zn-ion hybrid capacitors, with a large-capacity Zn anode (battery-type) integrated with a capacitive cathode, hold great potential to relieve the unsatisfactory energy-to-power ratio of aqueous supercapacitors. The research into cathode design is expected to bridge the capacity gap between the two e...
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Veröffentlicht in: | Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2022-01, Vol.10 (2), p.611-621 |
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Hauptverfasser: | , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Zn-ion hybrid capacitors, with a large-capacity Zn anode (battery-type) integrated with a capacitive cathode, hold great potential to relieve the unsatisfactory energy-to-power ratio of aqueous supercapacitors. The research into cathode design is expected to bridge the capacity gap between the two electrodes without sacrificing the inherent power/cycling superiorities but is still in its infancy. In this work, robust O/N-decorated porous carbon cathodes were derived by the
in situ
calcination of conjugated polyamides, wherein the solvent-guided strategy was applied to shape the carbon nanoarchitecture for the activation of Zn storage sites. After optimizing the solvent–precursor interactions, the packed particle architecture (C
DMF
) ultimately exposed ample electrosorption platform up to 1656 m
2
g
−1
, and O/N dopants (15.77 wt%) promoted interfacial Zn adsorption by lowering the energy barrier for C–O–Zn bonding. Further experimental evaluations revealed that the CO species on the robust C
DMF
framework tended to boost reversible chemical adsorption to form C–O–Zn bondings while maintaining durable charge transfer, which minimized capacity loss even at high rates. As a result, the aqueous C
DMF
//Zn capacitor achieved a large capacity of 180 mA h g
−1
, an ultrahigh energy density of 106.7 W h kg
−1
and an excellent power output of 13.4 kW kg
−1
, as well as 91.1% capacity retention over 300 000 cycles. This design strategy gives an appealing insight into the subtle fabrication of high-performance carbon cathodes and highlights their applicability towards practical Zn-based energy storage in the future. |
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ISSN: | 2050-7488 2050-7496 |
DOI: | 10.1039/D1TA07350H |