Progress in Supercapacitors: Roles of Two Dimensional Nanotubular Materials
Overcoming the global energy crisis due to vast economic expansion with the advent of human reliance on energy-consuming labor-saving devices necessitates the demand for next-generation technologies in the form of cleaner energy storage devices. The technology accelerates with the pace of developing energy storage devices to meet the requirements wherever an unanticipated burst of power is indeed needed in a very short time. Supercapacitors are predicted to future power vehicles because they promise faster charging times as well as do not rely on rare elements as lithium. At the same time, they are key nanoscale device elements for high-frequency noise filtering with the capability of storing and releasing energy by the electrostatic interactions between the ions in the electrolyte and the charge accumulated at the active electrode during the charge/discharge process. There have been several developments to increase the functionality of electrodes or finding a new electrolyte for higher energy density, but this field is still open to witness the developments of reliable materials-based energy technologies. The nanoscale materials have emerged as promising candidates for electrode choice, especially in 2D sheets and their folded tubular network forms. Due to their unique hierarchical architecture, excellent electrical and mechanical properties, and high specific surface area, the nanotubular networks have been widely investigated as efficient electrode materials in supercapacitors, while maintaining their inherent characteristics of high power and long cycling life. In this perspective, we briefly present the evolution, classification, functionality, and application of supercapacitors in a viewpoint from nanostructured materials to apprehend the mechanism and construction of advanced supercapacitors for next-generation storage devices.
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