Three-Dimensional MoS2@CNT/RGO Network Composites for High-Performance Flexible Supercapacitors

Graphical Will it bend? A novel 3D porous network MoS 2 @CNT/RGO membrane was designed, fabricated, and assembled into a symmetric flexible supercapacitor. The supercapacitor exhibits a high rate capability, stable cycling life at high rates, and high power density. The study may provide opportunities for expanding the potential of self-supporting electrode materials in portable/wearable electronics. Two-dimensional atomically thick materials, reduced graphene oxide (RGO), and layered molybdenum disulfide (MoS 2 ) have been investigated as potential novel energy storage materials because of their distinct physicochemical properties. These materials suffer, however, from rapid capacity decay and low rate capability. This study describes a facile, binder-free approach to fabricate large-scale, 3D network structured MoS 2 @carbon nanotube (CNT)/RGO composites for application in flexible supercapacitor devices. The as-obtained composites possess a hierarchical porosity, and an interconnected framework. The electrochemical supercapacitive measurements of the MoS 2 @CNT/RGO electrode show a high specific capacitance of 129 mF cm −2 at 0.1 mA cm −2 . The symmetric supercapacitor devices based on the as-obtained composites exhibit a long lifetime (94.7 % capacitance retention after 10 000 cycles), and a high electrochemical performance (29.7 mF cm −2 ). The present experimental findings will lead to scalable, binder-free synthesis of MoS 2 @CNT/RGO hybrid electrodes, with enhanced, flexible, supercapacitive performance, in portable and wearable energy storage devices.