Tunable 3D Nanostructured Conductive Polymer Hydrogels For Energy Storage Application

Three dimensional(3D)nanostructured conducting polymer hydrogels represents a group of high performance electrochemical energy storage materials.In this paper,we use a molecular self-assembly method to regulate the one-dimensional polypyrrole(PPy)nanofiber structure with controllable morphology.The 3D network of controllable morphology is optimized by the “crosslinking” effect of the conjugated doped molecule trypan blue(TB).First,The amino group in the TB molecule is protonated in the acidic ammonium persulfate(APS)aqueous solution,and the partially protonated TB molecules are ionically bonded,The free sulfonate ion forms a certain spatial structure through a self-sequencing mechanism,which interacts with the PPy chain through ionic and hydrogen bonding,and the PPy chains were oriented through a self-sorting mechanism.TB is used as a gelling agent to further self-assemble into a nanostructured hydrogel with PPy.The prepared conductive hydrogel has morphological controllability and excellent electrochemical properties.The results show that the target product has a large specific capacitance,and can be used as a potential material for next generation energy storage.1.The preparation of nanostructured conductive polymers,nanostructured conductive hydrogels and the application of conductive hydrogels are mainly introduced.Nanostructured conductive polymers mainly include 0D nanoparticles,1D nanofibers,2D nanosheets and 3D nanostructured hydrogels;the preparation of conductive hydrogels mainly includes the preparation by in-situ polymerization and direct polymerization for physical composite hydrogels,and intermolecular force crosslinking method for the conductive polymer hydrogel;The application of conductive polymer hydrogel in energy storage device,energy conversion,sensor,response gel and multifunctional gel is also discussed.2.Conductive hydrogels with one-dimensional nanostructures were prepared using trypan blue as a cross-linking agent and dopant.The chemical structure,crystallinity,morphology and electrochemical properties of the conductive hydrogel were characterized by Fourier transform infrared,X-ray crystal diffraction,scanning electron microscopy and electrochemical workstation.PPy hydrogels exhibit controlled morphology and tunable electrochemical properties at different dopant concentrations.At the same time,the capacitance of TB-doped PPy hydrogel is as high as 649 F/g at a current density of 1A/g,demonstrating its great potential for energy storage.3.The influence of different dopants on PPy hydrogel and trypan blue on polyaniline hydrogel were investigated.The effects of these two dopants on PPy hydrogels were studied by comparing the direct blue 2 and direct violet 1.It was found that they could not form one-dimensional nanofibers,and their electrochemical performance was significantly worse than that TB doped PPy hydrogel.The TB-doped PANI hydrogel exhibits the same morphological adjustability as the PPy hydrogel,but its electrochemical performance is lower than that of PPy hydrogel,further demonstrating the application value of PPy-TB hydrogel.