Hierarchical porous carbon prepared from biomass through a facile method for supercapacitor applications

Wenli Zhang, Jinhui Xu, Dianxun Hou, Jian Yin, DeBo Liu, YaPeng He, Haibo Lin

Research output: Contribution to journalArticlepeer-review

76 Scopus citations

Abstract

The porous carbon with angstrom-sized pores is important in supercapacitor applications, because of its high pack density and high specific capacitance. In this paper, a facile method is proposed for the preparation of hierarchical porous carbon with high-volume angstrom-sized pores. Onion, as the typical biomass in this research, is used as carbon precursor. First, onion was etched by KOH to obtain a water-soluble lignin-potassium-salt/cellulose composite. This composite was further pyrolyzed under N atmosphere to obtain onion derived porous carbon (OPC). The morphology and porous structure of OPC were characterized by scanning electron microscope and N adsorption/desorption. The supercapacitive performances of OPC were investigated by cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge-discharge. OPC shows high specific surface area with high-volume angstrom-sized pores in carbon matrix. When used as supercapacitor electrode materials, OPC shows high specific capacitance and good cycling stability. This paper opens a general way to prepare porous carbon from biomasses, which will promote the development of biomass utilization, preparation of porous carbon and supercapacitors.
Original languageEnglish (US)
Pages (from-to)338-344
Number of pages7
JournalJournal of Colloid and Interface Science
Volume530
DOIs
StatePublished - Jun 26 2018

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