Remarkable electrochemical performance of holey MXene/graphene hydrogel-based supercapacitor operated at − 60 °C in sulfuric acid aqueous electrolyte

The ability to store and deliver electricity quickly at low temperatures is crucial for exploring unknown spaces under harsh conditions. In this work, we present a supercapacitor with excellent high power density and ultra-low temperature tolerance. The supercapacitor is assembled using designed MXe...

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Bibliographic Details
Published in:Journal of solid state electrochemistry 2024, Vol.28 (9), p.3263-3274
Main Authors: Su, Qiuyao, Lin, Caixia, Xiang, Mingliang, Wang, Ni, Sun, Liangkui, Hu, Wencheng
Format: Article
Language:English
Subjects:
Analytical Chemistry
Aqueous electrolytes
Capacitance
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Electrochemical analysis
Electrochemistry
Electrolytes
Energy Storage
Freezing
Graphene
Hydrogels
Ion currents
Low temperature
MXenes
Original Paper
Physical Chemistry
Stability
Sulfuric acid
Supercapacitors
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Summary:The ability to store and deliver electricity quickly at low temperatures is crucial for exploring unknown spaces under harsh conditions. In this work, we present a supercapacitor with excellent high power density and ultra-low temperature tolerance. The supercapacitor is assembled using designed MXene/holey graphene hydrogel electrodes and an all-around 37.0% H 2 SO 4 electrolyte. It combines high ionic conductivity, self-supporting properties, and anti-freezing ability. The optimal composition ratio of the supercapacitor demonstrates a power density of 2500 μW cm −2 and an energy density of 64.86 μWh cm −2 , along with a high specific areal capacitance of 467 mF cm −2 and excellent cycle stability, retaining 90.23% of its capacitance after 20,000 cycles. The electrochemical stability can be maintained even at temperatures as low as − 40 °C (with a retention rate of approximately 71.08%) and − 60 °C (with a retention rate of approximately 60.11%). Additionally, the device exhibits outstanding cycle stability, with a capacitance retention rate of over 95% after 20,000 cycles at − 60 °C. This study provides an opportunity to develop acid supercapacitors as environmentally tolerant energy storage devices.
ISSN:1432-8488
1433-0768
DOI:10.1007/s10008-024-05894-7