Electrochemical self-assembled core/shell PEDOT@MoS2 composite with ultra-high areal capacitance for supercapacitor

An active material electrode with high areal specific capacitance is needed for a high-performance supercapacitor, but it is difficult to achieve this goal for PEDOT-based composites. Here, a novel hierarchical core/shell PEDOT@MoS 2 composite was assembled by the electrochemical co-deposition of EDOT and MoS 2 submicron spheres. The SEM, TEM images of the as-obtained composite explicitly reveal the core/shell heterostructure of PEDOT@MoS 2 with a diameter of about 800 nm. The electrochemical characterizations show that the optimized PEDOT@MoS 2 composite possesses a high specific capacitance of 2540 mF cm −2 at 1 mA cm −2 and excellent capacitance retention of 98.5% after 5000 cycles at a high current density of 100 mA cm −2 . The assembled P@M-4//PEDOT asymmetric supercapacitor shows a high energy density of 937 Wh m − 2 at 6500 W m − 2 , and outstanding cycling stability with capacitance retention of 100% after 5000 cycles. It is proposed that the enhanced performances are attributed to the robust hierarchical core/shell structures and the synergic effect between PEDOT and MoS 2 , which is expected to become a promising candidate for applications in high-performance supercapacitors.