Electrochemical Self-Assembly of a 3D Interpenetrating Porous Network PEDOT-PEG-WS2 Nanocomposite for High-Efficient Energy Storage

摘要

Like interchange bridges used in traffic, 3D interpenetrating porous network (3D IPN) nano-/micro materials are of great significance in the field of energy storage. Here, we developed a 3D IPN poly(3,4-ethyleenedioxythiophene)-poly(ethylene glycol)-WS2 (PEDOT-PEG-WS2) nano composite through the electrochemical self-assembly of EDOT and WS2 nanosheets with the assistance of PEG. The scanning electron microscopy, energy dispersive X-ray spectrometry, and X-ray photoelectron spectroscopy results explicitly demonstrated the formation of the 3D IPN PEDOT-PEG-WS2 nanocomposite. The electrochemical results indicated that the PEDOT-PEG-WS2 nanocomposite had high specific capacitance of 236.5 mF cm(-2) at 5 mV s(-1), which was about 3.1 times higher than that for PEDOT-PEG (77.5 mF cm(-2)). The symmetric supercapacitors based on PEDOT-PEG-WS2 presented a high specific energy of 78 W h m(-2) at 900 W m(-2) and high cycling stability of 91% after 5000 cycles. It was proposed that the enhanced performances were attributed to the unique 3D IPN structures and the synergistic effect between WS2 and PEDOT, which make it a promising candidate as a high-efficient electrode in electrochemical energy storage devices.