Recent Progress in Polyaniline and its Composites for Supercapacitors

Abstract Polyaniline (PANI) has piqued the interest of nanotechnology researchers due to its potential as an electrode material for supercapacitors. Despite its ease of synthesis and ability to be doped with a wide range of materials, PANI′s poor mechanical properties have limited its use in practical applications. To address this issue, researchers investigated using PANI composites with materials with highly specific surface areas, active sites, porous architectures, and high conductivity. The resulting composite materials have improved energy storage performance, making them promising electrode materials for supercapacitors. Here, we provide an overview of recent developments in PANI‐based supercapacitors, focusing on using electrochemically active carbon and redox‐active materials as composites. We discuss challenges and opportunities of synthesizing PANI‐based composites for supercapacitor applications. Furthermore, we provide theoretical insights into the electrical properties of PANI composites and their potential as active electrode materials. The need for this review stems from the growing interest in PANI‐based composites to improve supercapacitor performance. By examining recent progress in this field, we provide a comprehensive overview of the current state‐of‐the‐art and potential of PANI‐based composites for supercapacitor applications. This review adds value by highlighting challenges and opportunities associated with synthesizing and utilizing PANI‐based composites, thereby guiding future research directions.