One-step solid-state pyrolysis of bio-wastes to synthesize multi-hierarchical porous carbon for ultra-long life supercapacitors

Min Fu, Jintao Huang (Corresponding Author), Simin Feng, Tianyi Zhang, Peng Cheng Qian (Corresponding Author), Wai Yeung Wong (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)


Porous carbon is highly desired in supercapacitor electrodes due to its high specific surface area, ample pore size and superior electrochemical stability. Yet, the development of a general and simple synthetic method to prepare porous carbon remains challenging. Meanwhile, recycling waste to obtain high value-added materials is an effective way to solve environmental pollution and resource shortage problems. Herein, a general one-step solid-state pyrolysis method is developed to synthesize multi-hierarchical porous carbon using bio-wastes as precursors and potassium ferrate as the pore-forming agent. This method is superior to the traditional two-step or multi-step method due to its simple procedure, low cost, little pollution and time-saving features. The multiple pore-forming effect derived from potassium ferrate is responsible for this multi-hierarchical porous structure. The resulting porous carbon is used to fabricate symmetrical supercapacitors, exhibiting specific capacitances of 291.2 F g-1 at 1 A g-1 and 240.1 F g-1 at 10 A g-1, and exceptional cyclic stability with 93.2% capacitance retention over 100?000 cycles. Furthermore, this method has been applied to five other types of bio-wastes, verifying its universality. In addition, the multiple pore-forming mechanism of potassium ferrate is investigated. This work provides a simple and general method to convert abandoned bio-wastes into ideal supercapacitor electrode materials, which hold great potential in energy storage applications.

Original languageEnglish
Pages (from-to)2320-2327
Number of pages8
JournalMaterials Chemistry Frontiers
Issue number5
Publication statusPublished - 7 Mar 2021

ASJC Scopus subject areas

  • Materials Science(all)
  • Materials Chemistry

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