3D Double‐Crosslinked Polyaniline/p‐Phenylenediamine‐Modified Graphene Free‐Standing Electrodes for High‐Performance Supercapacitors

Abstract

The free‐standing electrodes are important for high‐performance supercapacitors. Polyaniline/graphene (PANI/rGO) composites are extensively researched. However, the structural design of free‐standing PANI/rGO electrodes needs further discussion. Herein, free‐standing PANI/rGO with 3D double‐crosslinked network structures is prepared by rGO modification, freeze drying, in situ polymerization, and gel die‐casting technology. The uniform precipitation of the ammonium persulfate on the surface of modified graphene (P‐rGO) sheets is profit to build a 3D double‐crosslinked network structure with PANI. Besides, the synergistic effect of aniline and p‐phenylenediamine helps to construct crosslinked PANI on the surface and deep in the pores of P‐rGO. The PANI/P‐rGO aerogels with a 3D porous double‐crosslinked structure are pressed into free‐standing electrodes by gel die casting and assembled into symmetrical supercapacitors. The electrodes show good cycling stability, which is much higher than that of P‐rGO or pure PANI.