3D hetero-nanostructured electrode constructed on carbon fiber paper with 2D 1T-MoS2/1D Cu(OH)2 for flexible asymmetric solid-state supercapacitors.

One-dimensional Cu(OH) 2 nanorods and two-dimensional 1T-MoS 2 nanosheets have attracted attention due to their attractive electrochemical properties. However, 1T-MoS 2 nanosheets tend to agglomerate and transform to 2H-MoS 2 , resulting in a decrease in electrochemical performance. In this study, flexible electrodes with 3D hetero-nanostructures are constructed by growing Cu(OH) 2 nanorod arrays and loading 1T-MoS 2 nanosheets on carbon fiber paper made of chopped carbon fibers as a conductive flexible substrate. The flower-shaped 1T-MoS 2 nanosheets with increased interlayer spacing are conducive to the rapid diffusion and insertion of electrolyte, while the conductive copper hydroxide nanorod array and carbon fiber paper can facilitate electron transport. The 1T-MoS 2 /Cu(OH) 2 @CFP based electrode has a high areal capacitance of 1124.0 mF cm−2 at 1 mA cm−2 and excellent cycle stability (with 98.3% capacitance retention after 10000 charge-discharge cycles). Furthermore, a flexible asymmetric solid-state supercapacitor (FASSC) device based on the as-prepared 1T-MoS 2 /Cu(OH) 2 @CFP electrode exhibits an energy density of 0.130 mWh cm−2 at a power density of 0.375 mW cm−2. The capacitance of FASSC device remains 90.8% of the initial value after 20000 cycles. In addition, the CFP substrate can be bent at a large angle and folded into different shapes, which makes 1T-MoS 2 /Cu(OH) 2 @CFP based electrodes suitable for flexible and portable electronics. [Display omitted] • 3D 1T-MoS 2 /Cu(OH) 2 hetero-nanostructure was grown on flexible CFP were constructed. • The 3D hetero-nanostructure offers rich electroactive sites for Faradaic reactions. • The 1T-MoS 2 /Cu(OH) 2 @CFP electrode shows a high areal capacitance of 1124.0 mF cm−2. • The assembled hybrid supercapacitor delivers a high energy density of 0.130 mWh cm−2. [ABSTRACT FROM AUTHOR]