Green Power: The Role of Plant‐Based Biochar in Advanced Energy Storage

Abstract This comprehensive review aims to provide an overview of recent progress in utilizing plant‐based biochar for supercapacitors. It specifically focuses on biochar derived from plant biomass such as agricultural residues, weeds and aquatic plants, examining their potential in energy storage applications. It explores various synthesis methods like pyrolysis and hydrothermal carbonization and evaluates their impact on biochar's structure and electrochemical properties. Additionally, it examines the electrochemical performance of biochar‐based supercapacitors, focusing on parameters such as capacitance, cycling stability, and rate capability. Strategies to enhance biochar's electrochemical performance, such as surface modification and composite fabrication, are also discussed. Furthermore, it addresses existing challenges and prospects in harnessing plant‐based biochar for supercapacitor applications, highlighting its potential as a sustainable and efficient electrode material for next‐generation energy storage devices.