Effect of Two Dimensional Additives on the Charge Storage Performance of All Solid-State Carbon Nanotube Based Flexible Supercapacitors.

Abstract

Flexible and miniaturized electronic devices have attracted widespread attention due to their potential for future hand-held, portable consumer, and wearable electronics. This has incited a growing interest in the development of compact yet efficient power sources that are flexible and holds the potential to be implemented in confined space for newer applications. In the present work, we report the CNT (Carbon NanoTubes) buckypaper integrated with electroactive 2D materials such as graphene, graphene oxide (GO), and the transition metal sulphides (TMDs) especially, tin sulphide (SnS2). The flexible and free-standing, interface-enhanced CNT paper having homogeneously dispersed 2D materials was prepared using a traditional scalable casting method. The hybridized CNT films were thoroughly characterized to elucidate their structural and surface properties. Finally, such hybrid CNT films were used as, free-standing electrodes without any binder for the fabrication of flexible-solid-state supercapacitor (FSSSs) devices. In the FSSS, the electrochemical interactions between hybrid CNT paper electrodes and polymer gel electrolyte were studied. In the symmetric configuration, the CNT-SnS2 electrodes reach the highest areal and volumetric capacitance, and almost 4 times that of pristine CNT electrodes, whereas CNT-GO-based electrodes display high-rate capability. The CNT-SnS2-based symmetric FSSS devices exhibit an extended voltage window of 1.5 V with a high capacitance of 133 mF/cm2 and show high cyclic stability for 5000 cycles under 180 ⁰ bending.