Reversible multielectron redox faradic reaction mechanisms occur in pseudocapacitors by which the specific capacitance and energy density can be determined. EDLCs follow a mechanism based on non-faradic processes, i.e., electrical absorption of electrolytic ions at the electrode/electrolyte interface. (5−7) Electrochemical double-layer capacitors (EDLCs) and pseudocapacitors are two major types of supercapacitors with diverse charge storage mechanisms. The best electrode for use in supercapacitors should have the features of inexpensiveness, nontoxicity, high-capacitance performance, and long-lasting cycles. (3,4) With significant advances in various optoelectronic and portable electronic markets, research has intensified to identify potential electrodes for supercapacitors. (1,2) Supercapacitors with a high charge/discharge rate and excellent cyclic life are not only excellent power sources but also reliable in energy storage devices. The low availability and high utilization of renewable energy resources has led to accelerated research to find alternative sources. This study emphasizes the importance of studying the direct growth of binder-free CNT electrodes to understand the actual behavior of electrodes and the proper storage mechanism. The device exhibited good cyclic stability, with 92.42% capacitive retention and 99.68% Coulombic efficiency at 10 000 cycles, indicating the suitability of the electrodes for practical applications. Furthermore, solid-state symmetric supercapacitors are fabricated using CNT-NF//CNT-NF, and fruitful results are obtained with maximum specific capacitance (250.51 F/g), energy density (68.19 Wh/kg), and power density (2799.77 W/kg) at 1 A/g current density. Thus, directly grown optimized CNT electrodes are used as electrodes for electrochemical devices. In this study, two different procedures are followed to enhance the growth of carbon nanotubes (CNT-E and CNT-NF) directly coated on a Ni-foam substrate by a well-functioning chemical vapor deposition (CVD) method. The need to develop cheaper and more competent binder-free electrodes for high-performance supercapacitors has attracted considerable research attention.
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