Multi-element co-doped biomass porous carbon with uniform cellular pores as a supercapacitor electrode material to realise high value-added utilisation of agricultural waste

Abstract

Biomass-based porous carbon materials have attracted considerable attention because of their simple, low-cost, green, and pollution-free preparation process. Owing to their unique tubular structure and subsequent activation process, they often...

Biomass-derived B/N/P co-doped porous carbons as bifunctional materials for supercapacitors and sodium-ion batteries

“…42,46 The doping of heteroatoms can significantly improve the properties of porous carbon materials in terms of increasing conductivity and modulating disorder and defects of materials, thus promoting the formation of surface pseudocapacitance, which benefits the application of samples in the field of electrochemistry. 5,47,48…”

“…49 The obvious hump on the rectangular CV curve intimates the partly pseudocapacitance due to the reversible redox reactions produced by heteroatoms. 47 It is noteworthy that the OPBNP shows the largest closed area due to its rich and uniform pore structure and ternary atom co-doping active sites, indicating its best capacitance performances. Fig.…”

“…The intercept at the real axis indicates the inner resistance ( R s ) generated by the contact effect within the electrode material, electrolyte ion resistance, and contact resistance of the active material/current collector, active material and the electrolyte. 47 The diameter of the semicircle arc on the real axis expresses the charge transfer resistance ( R ct ) produced at the interface between the electrode and electrolyte. Based on the fitting results (the equivalent circuit diagram and fitting data are shown in Fig.…”