One-Pot Hydrothermal Synthesis of Solution-Processable MoS/PEDOT:PSS Composites for High-Performance Supercapacitors.

It is challenging to hydrothermally synthesize solution-processable MoS, as the strong van der Waals force between MoS nanosheets induces self-assembly of agglomerates. Here, we introduce poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) into the precursor to impede aggregate formation in the hydrothermal process. A hybrid MoS/PEDOT:PSS (MP) hydrogel is formed due to the electrostatic interactions between the negatively charged MoS and positively charged PEDOT chains. This hydrogel can be easily dispersed in water for subsequent solution processing such as vacuum filtration to form free-standing flexible films or extrusion 3D printing to create novel patterns. The MP film with a fracture strength of 18.59 MPa displays excellent electrochemical performance in both aqueous NaSO electrolyte (474 mF cm) and solid-state PVA-HPO electrolyte (360 mF cm). Flexibility and robustness can be evidenced by high capacitance retention rates of 94 and 89% after being repeatedly bent to 180° for 5000 cycles in aqueous and solid-state electrolytes, respectively.