Issue 6, 2024

Construction of a binder-free PANI-CQD-Cu electrode via an electrochemical method for flexible supercapacitor applications

Abstract

In recent years, flexible hybrid supercapacitors (FSCs) have played a significant role in energy storage applications owing to their superior flexibility and electrochemical properties. In this study, carbon quantum dots (CQDs) were prepared from ascorbic acid via a hydrothermal method and physical and chemical characterizations were performed. Then, the carbon quantum dots (CQDs) were doped with polyaniline (PANI) and copper (Cu) to form a PANI-CQD-Cu composite coated on carbon cloth (CC) using an electropolymerization method. In the polymerization process, CQDs bind with the PANI chain and form a PANI-CQD-Cu composite. The prepared electrode's functional group and surface morphology were characterized through XRD, Raman, BET, XPS and SEM with EDAX studies. The electrochemical properties of the PANI-CQD-Cu electrode were investigated using cyclic voltammetry, impedance spectroscopy and galvanostatic charge–discharge study. The capacitance value of PANI-CQD-Cu was 1070 mF cm−2 at 5 mA cm−2 (1070 F g−1 at 1 A g−1), which was higher than that of PANI (775 mF cm−2). Moreover, a flexible asymmetric supercapacitor (FASC) based on an activated carbon/PVA-H2SO4/PANI-CQD-Cu device was fabricated, which exhibited outstanding energy and power densities of 23.10 μW h cm−2 and 0.978 mW cm−2, respectively. The capacitance value remained at 92% after 3000 cycles. The outcome results indicated that the PANI-CQD-Cu-coated CC electrode material can be a promising electrode material for practical energy storage applications.

Graphical abstract: Construction of a binder-free PANI-CQD-Cu electrode via an electrochemical method for flexible supercapacitor applications

Supplementary files

Article information

Article type
Paper
Submitted
10 Nov 2023
Accepted
20 Feb 2024
First published
04 Mar 2024
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2024,6, 1765-1780

Construction of a binder-free PANI-CQD-Cu electrode via an electrochemical method for flexible supercapacitor applications

E. Shanmugasundaram, V. Ganesan, V. Narayanan, K. Vellaisamy, N. Saleh and S. Thambusamy, Nanoscale Adv., 2024, 6, 1765 DOI: 10.1039/D3NA00986F

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