High-performance polypyrrole coated MoS2 nanosheets grown on carbon cloth as electrodes for flexible all-solid-state symmetric supercapacitor

Simultaneously improving the flexibility and electrochemical performance of electrode materials is a key issue to develop high-performance flexible all-solid-state supercapacitors. Herein, carbon cloth (CC) was applied as a flexible substrate and coated by MoS2 nanosheets through a hydrothermal method. Polypyrrole (PPy) was then deposited on MoS2 nanosheets by electrochemical deposition. Therefore, a novel PPy/MoS2/CC composite was prepared, in which PPy improves not only the capacitive performance, but also the rate capability and cycling stability significantly. The areal capacitance of PPy/MoS2/CC reaches 1150.4 mF cm(-2) at 1 mA cm(-2) and the specific capacitance retention can still maintain 87.2% after 5000 cycles (at 5 mA cm(-2)). It is worth mentioning that PPy/MoS2/CC was applied as working electrode to assemble a flexible all-solid-state symmetric supercapacitor. The device has a specific capacitance of 1016.4 mF cm(-2) at 2 mA cm(-2) and an energy density of 1.412 mWh cm(-3) at the power density of 10 mW cm(-3), which has outstanding application value for the development of flexible wearable devices.

Automated summary

In this study, carbon cloth was used as a flexible substrate and coated with MoS2 nanosheets, followed by electrochemical deposition of polypyrrole. A PPy/MoS2/CC composite was prepared, which improved not only capacitive performance, but also rate capability and cycling stability significantly. The composite showed promising application value for the development of flexible wearable devices due to its impressive specific capacitance and energy density.