Pompon-like MnO2 and N/O doped nanoporous carbon composites with an ultrahigh capacity for energy storage

Porous carbon materials and metal oxides are the most favorite electrode materials for supercapacitors. Herein, we put forward a novel biomass-derived carbon and metal oxide composite which denoted as AGC@MnO2 (activated ganoderma lucidum spore-derived O and N co-doped nanoporous carbon and pompon-like MnO2 composite). When tested as electrode material, AGC@MnO2 exhibits an excellent capacity of 1324 F g(-1) at 1 A g(-1) in a three-electrode system. Besides, AGC@MnO2 exhibits a high energy density of 43.75 Wh kg(-1) at a low power density of 250 W kg(-1) and an ultra-long cycling life of 92.3% retention after 5000 times charge and discharge at 20 A g(-1). All of the electrochemical results indicate AGC@MnO2 is a potential and valuable candidate of electrode materials for supercapacitors. (C) 2020 Published by Elsevier Ltd.