Preparation of hierarchical porous carbon derived by edible fungus residues for high performance supercapacitors

Realizing high specific surface area and high heteroatom doping is the main challenge for carbon materials as electrode materials for high energy density supercapacitors. In this paper, edible fungus residue is used as the precursor via an effective carbonization-activation approach to obtain the edible fungi derived hierarchical porous carbons (EFHPCs) and adjust the porosity and heteroatom doping of carbon materials. When the EFHPC was assembled in asymmetric aqueous supercapacitor, the energy density reached to 113.12 Wh/kg at power density of 750.0 W/kg, which is significantly higher than that of commercial activated carbon. Therefore, EFHPCs can be used as ideal negative electrodes for asymmetric supercapacitors. These results indicate that the synthesis strategy adopted to design carbon with good porosity and heteroatom doping is promising for advanced supercapacitors.

Automated summary

In this study, edible fungus residue is used as a precursor to obtain edible fungi derived hierarchical porous carbons (EFHPCs) with hierarchical porous structure and heteroatom doping through a carbonization-activation method. When assembled in an asymmetric aqueous supercapacitor, EFHPCs exhibit significantly higher energy density and can be used as ideal negative electrodes for supercapacitors.