Citrus-peel-derived, nanoporous carbon nanosheets containing redox-active heteroatoms for sodium-ion storage

Na Rae Kim, Young Soo Yun, Min Yeong Song, Sung Ju Hong, Minjee Kang, Cecilia Das Neves Barbosa Leal Lauten, Yung Woo Park, Hyoung Joon Jin

Research output: Contribution to journalArticlepeer-review

Abstract

Advanced design of nanostructured functional carbon materials for use in sustainable energy storage systems suffers from complex fabrication procedures and the use of special methods and/or expensive precursors, limiting their practical applications. In this study, nanoporous carbon nanosheets (NP-CNSs) containing numerous redox-active heteroatoms (C/O and C/N ratios of 5.5 and 34.3, respectively) were fabricated from citrus peels by simply heating the peels in the presence of potassium ions. The NP-CNSs had a 2D-like morphology with a high aspect ratio of >100, high specific surface area of 1167 m 2 g -1 , and a large amount of nanopores between 1 and 5 nm. The NP-CNSs also had an electrical conductivity of 2.6 × 10 1 s cm -1 , which is approximately 50 times higher than that of reduced graphene oxide. These unique material properties resulted in superior electrochemical performance with a high specific capacity of 140 mAh g -1 in the cathodic potential range. In addition, symmetric full-cell devices based on the NP-CNSs showed excellent cyclic performance over 100'000 repetitive cycles.

Original languageEnglish (US)
Pages (from-to)3175-3181
Number of pages7
JournalACS Applied Materials and Interfaces
Volume8
Issue number5
DOIs
StatePublished - Feb 10 2016

Keywords

  • carbon nanosheet
  • electrode
  • porous carbon
  • pyrolysis
  • sodium-ion battery
  • supercapacitor

ASJC Scopus subject areas

  • Materials Science(all)

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