In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 9, No. 46 ( 2021), p. 26135-26148
Abstract:
The structural instability and sluggish kinetics of conventional positive electrodes with the lower capacitance of carbon-based negative electrodes result in an inferior performance for state-of-art supercapacitors (SCs). A general yet sustainable approach is proposed here to overcome this hitch by assembling hybrid SC cells utilising porous and stable 2D-on-2D core–shell and carbon/pseudocapacitive composite electrodes. Porous Co 3 (PO 4 ) 2 transparent stacked micropetals (TSMs) were synthesised and decorated with Co 2 Mo 3 O 8 nanosheets (NSs) (Co 3 (PO 4 ) 2 @Co 2 Mo 3 O 8 ) forming a 2D-on-2D core–shell positive electrode, which was combined with a 2D carbon nanotube/MXene (CNT–Ti 3 C 2 T X ) composite negative electrode. The core–shell electrode achieved a specific capacity of 184.7 mA h g −1 (738 mF cm −2 ) and cycling stability of 95.6% over 15 000 charge/discharge cycles. The CNT–Ti 3 C 2 T X electrode exhibited a remarkable areal capacitance of 187.5 mF cm −2 and cycling stability of 93.1%. Consequently, the assembled unique hybrid solid-state SCs delivered an exceptional volumetric capacitance of 7.9 F cm −3 and a specific energy of 74.06 W h kg −1 (2.47 mW h cm −3 ) at a specific power and cycling stability of 1.13 kW kg −1 and 93.2%, respectively. Overall, the techniques and electrode materials presented in this study can serve as a reference to produce a range of electrode materials for next-generation energy storage devices.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2021
detail.hit.zdb_id:
2702232-8
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