Abstract
In this study, the nanocomposite of g-C3N4 quantum dots/MnCO3 on carbon cloth (q-MC//CC) is prepared via a simple hydrothermal method. The obtained q-MC//CC composite is employed for a flexible supercapacitor electrode. The g-C3N4 quantum dots could effectively improve the interface electrical conductivity and ion transportation of the MnCO3 electrode, which results in superior electrochemical performance. The q-MC//CC electrode delivers a high specific capacity of 1001 F·g−1 at a current density of 1 A·g−1 and a good cycling performance of 96% capacity retention after 5000 cycles. Moreover, an asymmetric flexible supercapacitor (ASC) is assembled with q-MC//CC and carbon cloth as a positive and negative electrode, respectively, which exhibits a high energy density of 27.1 Wh·kg−1 at a power density of 500 W·kg−1. In addition, the fabricated ASC device demonstrates the ability to power the light-emitting diode effectively under mechanical bending.
Highlights
Supercapacitors have attracted considerable attention for the application of advanced energy storage devices of electronic vehicles and portable electronic devices due to their beneficial properties such as excellent power density, rapid charging time, and durability [1]
After the hydrothermal carbon cloth shows a smooth surface consisting of aligned carbon fiber bundles
After the reaction of the synthesis of q-MC//CC, it is observed that clusters of spindle-shaped petals of MnCO3 hydrothermal reaction of the synthesis of q-MC//CC, it is observed that clusters of spindle-shaped were densely grown on the surface of carbon fibers
Summary
Supercapacitors have attracted considerable attention for the application of advanced energy storage devices of electronic vehicles and portable electronic devices due to their beneficial properties such as excellent power density, rapid charging time, and durability [1]. Pseudocapacitors can exhibit substantially high specific capacitance and high energy density compared to EDLC, owing to the fast and reversible surface Faradaic redox reaction. Transition metal oxide and carbonate materials have been explored as electrode materials of pseudocapacitors due to their high theoretical storage capacity and superior reversibility. Mn-based active materials have attracted a great deal of interest owing to the high theoretical capacitance, low cost, and natural abundance [2,3,4,5]
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