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•Oxygen-rich hierarchical porous carbon has been successfully prepared from pomelo peel fiber via an improved KOH activation method.•Without any extraneous doping, the oxygen content of the carbon materials is as high as 15.61%.•The carbon materials-modified electrode exhibits high specific capacitive properties, promising rate performance and superior cycle performance.•This work would provide a strategy for its disposal issue and contribute to the environmental improvement.
Oxygen-rich hierarchical porous carbon has been fabricated using pomelo peel fiber as a carbon source via an improved KOH activation method. The morphology and chemical composition of the obtained carbon materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), electron microscopy (EM), Raman spectra and elemental analysis. The unique porous structure with abundant oxygen functional groups is favorable to capacitive behavior, and the as-prepared carbon material exhibits high specific capacitance of 222.6Fg−1 at 0.5Ag−1 in 6M KOH and superior stability over 5000 cycles. This work not only describes a simple way to prepare high-performance carbon material from the discarded pomelo peel, but also provides a strategy for its disposal issue and contributes to the environmental improvement.