Recent Trends in Carbon Nanotube Electrodes for Flexible Supercapacitors: A Review of Smart Energy Storage Device Assembly and Performance

Abstract

In order to upgrade existing electronic technology, we need simultaneously to advance power supply devices to match emerging requirements. Owing to the rapidly growing wearable and portable electronics markets, the demand to develop flexible energy storage devices is among the top priorities for humankind. Flexible supercapacitors (FSCs) have attracted tremendous attention, owing to their unrivaled electrochemical performances, long cyclability and mechanical flexibility. Carbon nanotubes (CNTs), long recognized for their mechanical toughness, with an elastic strain limit of up to 20%, are regarded as potential candidates for FSC electrodes. Along with excellent mechanical properties, high electrical conductivity, and large surface area, their assemblage adaptability from one-dimensional fibers to two-dimensional films to three-dimensional sponges makes CNTs attractive. In this review, we have summarized various assemblies of CNT structures, and their involvement in various device configurations of FSCs. Furthermore, to present a clear scenario of recent developments, we discuss the electrochemical performance of fabricated flexible devices of different CNT structures and their composites, including additional properties such as compressibility and stretchability. Additionally, the drawbacks and benefits of the study and further potential scopes are distinctly emphasized for future researchers.

Efficient faradaic supercapacitor energy storage using redox-active pyrene- and benzodithiophene-4,8-dione-tethered conjugated microporous polymers

“…[15][16][17] Generally, pseudocapacitors are typically constructed from transition-metal oxides such as MnO 2 and Fe 2 O 3 , whereas EDL-based supercapacitor electrodes are commonly constructed from various forms of carbon, such as activated carbon, graphene, and carbon nanobers. [18][19][20][21][22][23][24] Organic electrode materials, including polyanilines, polypyrroles, polythiophenes, and Schiff-base polymers, appeal to some scientists due to their low energy consumption, remarkable redox activity, and environmental friendliness. [25][26][27] Schiff-base polymers, for instance, can either connect redox-active moieties or serve as redox-active moieties themselves.…”

Carbon nanotubes as a suitable material for electrochemical sensor used in voltammetric determinations of titanium

“…In our research, we used nanotubes to modify the electrode thanks to which the sensitivity of the determinations was increased compared to the procedure based on PbFE formed on classic glassy carbon electrodes and additionally the range of linearity has been increased. Carbon nanotubes, due to their extraordinary properties (mechanical, strength, electrical), have a wide area of application, and they also turned out to be a very valuable electrode material (Das et al 2022;Gupta et al 2019;Maheswaran and Shanmugavel 2022). Also in the case of voltammetric sensors, you can find the use of multiwall carbon nanotubes, such as carbon-nanotube-modified glassy carbon electrode (Baranowska and Bijak 2013;Kumar and Vicente-Beckett 2012), carbon-nanotube-modified carbon paste electrode (Deng et al 2008) as well as bismuth-modified carbon nanotube electrode (Hwang et al 2008;Stočes et al 2012) or copper film with carbon-nanotubes-modified electrode (Wasąg and Grabarczyk 2021).…”

Investigation of Si-Coated Multiwalled Carbon Nanotubes as Potential Electrodes for Multivalent Metal-Ion Electrochemical Energy Storage Systems

“…The appealing properties of carbon nanotubes (CNTs), superior electroconductivity, and mechanical robustness have strongly motivated their investigation in microelectronics, hydrogen storage, and flexible devices. , Carbon film, carbon textile, carbon fabric, and paper-like flexible carbon networks have been found to be most efficacious when used in flexible supercapacitor devices . The functional properties of supercapacitors have been significantly improved, according to a more recent study, by the porous structure of CNTs .…”

“…20,21 Carbon film, carbon textile, carbon fabric, and paper-like flexible carbon networks have been found to be most efficacious when used in flexible supercapacitor devices. 22 The functional properties of supercapacitors have been significantly improved, according to a more recent study, by the porous structure of CNTs. 23 The porous structure accelerates the charge transfer during the electrochemical processes and enables effective interaction with the electrolyte ions, thereby enhancing the capacitance value.…”