Issue 11, 2023

Different pretreatment methods combined with subsequent activation to convert waste eucalyptus bark into porous carbon electrode materials for supercapacitors

Abstract

Exploring the effects of different pretreatment methods on the properties of materials is of great significance for the effective utilization of waste biomass to produce high value-added porous carbon. Herein, the waste eucalyptus bark was used as a low-cost biomass resource to produce a series of biomass porous carbons (BPCs) for supercapacitor electrode materials. The effects of different pretreatment methods on the physicochemical structure and supercapacitor performance of BPCs obtained by KOH were investigated systematically. It was found that the BPCs prepared from different methods had certain differences in morphology, phase structure, porous properties and surface chemical properties, which resulted in a significant influence on supercapacitor performance. The hydrothermal pretreatment was conducive to form 3D honeycomb-like architectures with a hierarchical pore structure in the KOH activation process, which resulted in an excellent cycling stability. The pyrolysis pretreatment was beneficial to improve the graphitization degree of porous carbons and produce more micropores and oxygen-containing functional groups, which presented a lower equivalent series resistance and higher specific capacitance with poor rate behavior and cycling stability. Among them, the PBPC-600 electrode possessed a marvelous specific capacitance of 349.4 F g−1 at 0.5 A g−1, displaying great application potential as an electrode material for supercapacitors. Moreover, to meet the portable requirement, the PBPC-600 based symmetric quasi-solid-state supercapacitor was assembled, which achieved a remarkable energy density as high as 15.0 W h kg−1 at a power density of 160.0 W kg−1.

Graphical abstract: Different pretreatment methods combined with subsequent activation to convert waste eucalyptus bark into porous carbon electrode materials for supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
11 Dec 2022
Accepted
05 Feb 2023
First published
06 Feb 2023

New J. Chem., 2023,47, 5316-5329

Different pretreatment methods combined with subsequent activation to convert waste eucalyptus bark into porous carbon electrode materials for supercapacitors

K. Li, Z. Liu, X. Ma, Q. Feng, D. Wang and D. Ma, New J. Chem., 2023, 47, 5316 DOI: 10.1039/D2NJ06060D

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