Preparation Of Poly(3,4-Ethylenedioxythiophene)2D Materials And Their Application In Supercapacitors

Two-dimensional(2D)organic materials hold great promise for use in a multitude of contemporary applications due to their outstanding chemical and physical properties.With the discovery of graphene,more and more twodimensional materials have been developed,and the preparation methods have always been the research hotspots of two-dimensional materials.Inorganic twodimensional materials such as black phosphorus,MXene have been greatly restricted in their application due to their cumbersome preparation process and low yield.In contrast,organic two-dimensional materials have simple preparation methods and diverse preparation methods.At the same time,they also have many additional characteristics such as simple structure,good mechanical flexibility.The 2D materials exhibit features that are unique from those found in their bulk counterparts and thus they are expected to enable a variety of applications that range from energy storage and conversion to catalytic chemistry,electronics,optics,and sensorsHerein,a method for preparing two-dimensional sheet materials from commercial poly(3,4-ethylenedioxy thiophene):poly(4-styrene sulfonate)(PEDOT:PSS)using ice templates is proposed.Ice crystals was used as a template to induce the growth of a 2D sheets,and addition of WO3 nanowires leads to composite sheets(termed“WO3@PEDOT:PSS”),which exhibit increased robustness and relatively course surfaces when compared with their pristine analogues.The method is straightforward to perform,scalable,and high yielding.Subsequently,2D X-ray diffraction,polarized Raman spectroscopy,in situ small-angle X-ray scattering and Infrared spectroscopy were used to study the orientation structure of molecular chains in the sheets and the sheets assembly mechanism and the results revealed that the 2D sheets form via the untangling of the polymer chains in the PEDOT:PSS grains concomitant with packing of the PEDOT chains along the growth direction of the ice crystals during the freezing process.By applying the 2D composite sheets material to the supercapacitor,the advantages of the 2D conjugated polymer sheets material in electrochemical energy storage are verified.These devices feature high charge transport rates,high rate capacities(e.g.,areal capacitances of 166.8 and 128 mF cm-2 were measured with a 0.25-mm-thick film at 0.5 and 20 mA cm-2,respectively)and thickness-independent energy storages.