Black liquor-derived porous carbons from rice straw for high-performance supercapacitors

Linfeng Zhu, Feng Shen, Richard L. Smith, Lulu Yan, Luyang Li, Xinhua Qi

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Rice straw is pretreated with KOH aqueous solution and the resulting liquid is used to synthesize a black liquor-derived porous carbon (BLPC) in which KOH acts as both lignin extraction solvent and chemical activation agent. The addition of melamine into the black liquor leads to an increase in the surface area (2646 m2 g−1), pore volume (1.285 cm3 g−1) and promotes the formation of nitrogen covalent bonds in the carbon materials (N-BLPC). Melamine used as additive has dual roles as nitrogen source and pore modifier of the carbon material. The as-prepared materials have specific capacitances of 242 F g−1(BLPC) and 337 F g−1(N-BLPC) when used as electrodes in 6 M KOH electrolyte at a current density of 0.5 A g−1. The assembled N-BLPC-based symmetric supercapacitor shows stable cycling (>98% retention after 3000 cycles at 10 A g−1). The proposed strategy offers a facile method to produce porous carbons from waste black liquor in biorefinery or pulp and paper processes.

Original languageEnglish
Pages (from-to)770-777
Number of pages8
JournalChemical Engineering Journal
Volume316
DOIs
Publication statusPublished - 2017 Jan 1

Keywords

  • Biomass
  • Black liquor
  • Carbon
  • Lignin
  • Supercapacitor

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Fingerprint Dive into the research topics of 'Black liquor-derived porous carbons from rice straw for high-performance supercapacitors'. Together they form a unique fingerprint.

  • Cite this