Conversion of soybean waste to sub-micron porous-hollow carbon spheres for supercapacitor via a reagent and template-free route

Shanshan Wang, Wei Sun, Dong Sheng Yang, Fuqian Yang

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Sub-micron porous-hollow carbon spheres are synthesized from ground soybean waste via a facile and economical hydrothermal carbonization and high-temperature heat-treatment in different media. The sub-micron porous-hollow carbon spheres after the heat treatment with the flow of argon have an average size of 398 ± 10 nm and an average shell thickness of ∼40 nm. The carbon in the porous-hollow spheres is amorphous. The electrochemical analyses of the porous-hollow spheres reveal that the porous-hollow carbon spheres heat-treated with the flow of the mixture of N2 and H2O steam have good capacitive properties and high specific capacitances, and the porous-hollow carbon spheres heat-treated in an inert medium (N2 or Ar)possess relatively low capacitances with good rate capability. The results reported in this work likely provide a new and simple route for preparing functional materials with designed structures.

Original languageEnglish
Pages (from-to)50-55
Number of pages6
JournalMaterials Today Energy
Volume13
DOIs
StatePublished - Sep 2019

Bibliographical note

Funding Information:
This work is supported by the NSF through the grant CMMI-1634540 (FQY)monitored by Dr. Khershed Cooper, the grant CHE-1800316 (DSY)of Division of Chemistry, and the National Natural Science Foundation of China (No. 21805123)(WS).

Funding Information:
This work is supported by the NSF through the grant CMMI-1634540 (FQY) monitored by Dr. Khershed Cooper, the grant CHE-1800316 (DSY) of Division of Chemistry, and the National Natural Science Foundation of China (No. 21805123 ) (WS).

Publisher Copyright:
© 2019 Elsevier Ltd

Keywords

  • Biomass waste
  • Hollow-porous structure
  • Template-free

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science (miscellaneous)
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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