Biomass-derived ultrathin mesoporous graphitic carbon nanoflakes as stable electrode material for high-performance supercapacitors

S. Sankar, Abu Talha Aqueel Ahmed, Akbar I. Inamdar, Hyunsik Im, Young Bin Im, Youngmin Lee, Deuk Young Kim, Sejoon Lee

Research output: Contribution to journalArticlepeer-review

137 Scopus citations

Abstract

With the motivation of materializing a high-performance electrode material for the high-energy supercapacitor, ultrathin mesoporous graphitic‑carbon was synthesized from biomass green-tea wastes via the KOH activation process combined with either of the water or the hydrochloric acid treatment. The water-treated graphitic‑carbon showed an interconnected ultrathin-nanoflake structure with a high porosity, while the hydrochloric acid-treated graphitic carbon exhibited an aggregated structure of irregular nanoparticles. The supercapacitor with an electrode of water-treated graphitic‑carbon nanoflakes displayed an enhanced specific capacitance of 162 F/g at 0.5 A/g. Furthermore, the device revealed an excellent cycle stability after multiple cyclic charge-discharge operations (i.e., 121% cyclic capacitance retention over 5000 cycles). These may open up a new avenue toward the recycling of biomass carbonaceous resources (e.g., green tea wastes) for inexpensive high-performance electrochemical energy-storage devices such as high-energy supercapacitors.

Original languageEnglish
Article number107688
JournalMaterials and Design
Volume169
DOIs
StatePublished - 5 May 2019

Keywords

  • Biomass resource
  • Electrode
  • Graphitic carbon
  • Green tea waste
  • Nanoflakes
  • Supercapacitor

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