Fabrication and electrochemical behavior of halloysite/ graphene-polyaniline three-dimensional hybrid aerogel loaded with iron oxide

Abstract Interesting phenomena in assisting electron transfers and stress to transfer behavior of reduced graphene oxide aerogel/antimony tin oxide-polyaniline hybrids were reported in our previous work. In this paper, halloysite/graphene-polyaniline three-dimensional hybrid aerogel loaded with Fe3O4(HGA-PANI) was fabricated. The microstructure, mechanical properties, and electrochemical properties of HGA-PANI were characterized by scanning electron microscope (SEM), X-ray Photoelectron Spectroscopy (XPS), N2 adsorption-desorption tests, universal material testing machine, electrochemical workstation, and so on. Halloysite nanotubes were fixed on the surface of graphene sheets or intercalated between graphene nanosheets. The three-dimensional network structure was formed, which reduces the agglomeration between graphene sheets. The hybrid of halloysite nanotube and graphene sheet increased the graphene's specific surface area and realized a three-dimensional network porous structure. Through Cyclic voltammetry (CV), Galvanostatic charge-discharge (GCD), Electrochemical impedance spectroscopy (EIS), and cycle stability tests, HGA-PANI had acceptable electrical properties, large capacitance, thin internal resistance, and amazing cyclical stability.