Wood‐Derived Nanoporous Graphitic Carbon: A Green Material for Efficient Energy Storage in Symmetric Supercapacitors

Abstract Wood‐derived porous carbon materials with tuneable porosity and a high degree of graphitization have garnered significant fascination in the last few years. These materials are an obvious choice for realizing the vision of functional materials inspired by wood for energy engineering. Owing to their natural abundance and biodegradability, wood‐based devices possess the potential to significantly enhance the advancement of effective power storage and transformation technologies, which can be attributed to their adjustable functionalities, flexibility, mechanical integrity, and hierarchically porous structures. The present research introduces a creative approach using activated Eucalyptus wood‐derived functional nanoporous carbon material exhibiting a high degree of graphitization (Ac‐Eu‐wood‐NC) for applications in charge storage. In comparison to previously documented activated wood, Ac‐Eu‐wood‐NC, which possesses a substantial BET surface area (1454 m 2 g −1 ) and optimized mesopores (3.7 nm), demonstrates remarkable capacitance (293 F g −1 ) in a 1 M H 2 SO 4 electrolyte. This sustainable, metal‐free electrode provides scalable, environmentally friendly options for advanced energy storage devices. The symmetric supercapacitor device utilizing an ionic liquid electrolyte, specifically 1‐butyl‐3‐methylimidazolium tetrafluoroborate ([bmim][BF 4 ]), demonstrates a specific power of 25,000 W kg −1 and maximal specific energy of 39.6 Wh kg −1 .