High‐Performance Flexible Solid‐State Asymmetric Supercapacitors based on Ordered Mesoporous Cobalt Oxide

Abstract

Asymmetric supercapacitors (ASCs) have attracted growing interest and attention in the field of supercapacitors owing to their high energy density and power density. In this work, ordered mesoporous Co3O4 samples with different pore sizes (ca. 20 nm and ca. 70 nm) are prepared via a hard template method. Flexible solid‐state ASC devices based on mesoporous Co3O4 with pore size of 20 nm and activated carbon possesses a specific capacitance of 215 mF cm−2 (at 1.5 mA cm−2) and show excellent cycling performance. Electrochemical tests reveal that the mesoporous material with a larger specific surface area, that is, a smaller primary particle size, is more suitable for solid‐state ASC device. The results provide a potential electrode material for ACSs.

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Three-dimensional nickel vanadium layered double hydroxide nanostructures grown on carbon cloth for high-performance flexible supercapacitor applications

“…1,2 As far as applications such as wearable/foldable electronics are concerned, exible supercapacitors are considered as one of the promising candidates, regarding the overall requirements. [3][4][5] Supercapacitors have attained great importance in energy storage due to their superior power densities compared to batteries. However, they still suffer from lower energy densities (#10 W h kg À1 ) than rechargeable batteries.…”

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“…It is the ideal choice for energy storage due to its fast charging/discharging, high reliability, long cycle life, and minimal environmental impact. The increasing demand for renewable and sustainable clean energy storage devices has stimulated intense research interest in the electrochemical supercapacitors field in recent years [1][2][3][4][5][6][7]. As an important branch of the supercapacitors family, pseudocapacitors can be used to store and provide energy for applications by the fast reversible redox reaction of the electrode material, which has a higher specific capacitance.…”