Abstract: Due to its large specific capacitance, high electrical conductivity, chemical stability and many other advantages, polypyrrole is considered to be the most likely conductive polymer for industrialization. However, bulk polypyrrole is usually deficient in electrical, optical and biological properties, while nano-structured polypyrrole has special electrochemical activity, improved optical properties and good biocompatibility due to its well-defined nanostructure and larger surface area. In addition, with the rapid development of science and technology, single polypyrrole nanomaterials have been insufficient to cope with the application needs of various aspects. However, polypyrrole nanocomposites can retain the function of the individual components and the synergistic effect when integrated with other functional materials, and can simultaneously possess the advantages of several materials, thus greatly broadening the application range of polypyrrole. This article summarizes the research progress of polypyrrole nanocomposites and introduces the five types of polypyrrole nanocomposites. Based on their excellent electrical conductivity and reversible redox properties, the applications of polypyrrole nanocomposites in the fields of energy storage, biomedicine, adsorption and impurity removal, electrocatalysis, wave-absorbing materials, sensors and corrosion protection are presented. Finally, the perspectives on the challenges and opportunities in this emerging area of research are discussed.
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