Novel Green Method for Synthesizing Plane Tree Seeds-Based Porous Carbon Used as Symmetric Supercapacitors
摘要
The practical application of hierarchical porous carbon materials in supercapacitors (SCs) promoted the development of a simple and sustainable preparation method. Plane tree seed-based porous carbon (PBC) was synthesized using static air activation with plane tree seeds as precursors and their hierarchical porous structure was regulated by controlling the reaction temperature. The physicochemical properties of the produced PBCs were characterized through scanning electron microscopy, X-ray diffraction, Raman spectroscopy, N2 adsorption–desorption, X-ray photoelectron spectroscopy, and energy dispersive X-ray spectroscopy. The optimized hierarchical porous carbon materials obtained at an activation temperature of 700 °C possessed a high specific surface area, an optimal hierarchical porous structure dominated by mesoporous structures, and functional groups containing N and O for doping. The formation and evolution of hierarchically porous structures during static air activation were described in detail. In a three–electrode system, the optimal PBC exhibited the highest specific capacitance of 187.05 F g−1 at 0.5 A g−1. Moreover, the constructed symmetric SC achieved a high energy density of 11.03 Wh kg−1 at a power density of 250 W kg−1 and exhibited remarkable electrochemical stability (100% over 7000 cycles at 10 A g–1). It can be predicted that static air activation might be a simple and sustainable method widely used for preparing carbon materials with high energy storage and conversion efficiency.
Graphical Abstract