Optimization of ultrasonic-assisted electrodeposition for high-performance CQDs-PPy/NPG composite electrodes in supercapacitors

IF 6.7 1区 工程技术 Q2 ENERGY & FUELS
Fuel Pub Date : 2024-12-01 DOI:10.1016/j.fuel.2024.133852
Huaxing Li , Fafeng Xia , Chunyang Ma
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引用次数: 0

Abstract

In this study, carbon quantum dots-polypyrrole/nanoporous gold (CQDs-PPy/NPG) composite electrodes were developed using ultrasonic-assisted electrodeposition with ultrasonic power levels ranging from 50 W to 200 W. The effects of ultrasonic power on the structural and electrochemical performance of the electrodes were systematically investigated. The electrode prepared at 150 W achieved a specific capacitance of 673.6F/g at a scan rate of 10 mV/s and 627.1F/g at 100 mV/s, reflecting a rate capability of 93.1 %. In contrast, the electrode prepared at 50 W demonstrated a specific capacitance of 437.8F/g at 10 mV/s and 251.0F/g at 100 mV/s, underscoring the considerable improvement in capacitance with higher ultrasonic power. Galvanostatic charge–discharge (GCD) tests at a current density of 5 A/g showed that the 150 W sample achieved a charging time of 408 s and a discharging time of 395 s, corresponding to a coulombic efficiency of 96.8 %. This composite electrode also exhibited excellent cycling stability, retaining 94.2 % of its initial capacitance after 20,000 cycles. Furthermore, it demonstrated an energy density of 513.7 Wh/kg at a power density of 5 W/kg. These findings suggest that optimizing ultrasonic power, particularly at 150 W, significantly improved the dispersion of CQDs and PPy, resulting in enhanced electrochemical performance. This composite emerges as a promising candidate for advanced supercapacitor applications. Furthermore, the CQDs-PPy/NPG composite was integrated into an asymmetric supercapacitor (ASC) using activated carbon (AC) as the negative electrode, achieving a high energy density of 42.8 Wh/kg at a power density of 2000 W/kg.
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来源期刊
Fuel
Fuel 工程技术-工程:化工
CiteScore
12.80
自引率
20.30%
发文量
3506
审稿时长
64 days
期刊介绍: The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.
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