Scalable holey graphene synthesis and dense electrode fabrication toward high-performance ultracapacitors

Xiaogang Han, Michael R. Funk, Fei Shen, Yu Chen Chen, Yuanyuan Li, Caroline J. Campbell, Jiaqi Dai, Xiaofeng Yang, Jae Woo Kim, Yunlong Liao, John W. Connell, Veronica Barone, Zhongfang Chen, Yi Lin, Liangbing Hu

Research output: Contribution to journalArticlepeer-review

185 Scopus citations

Abstract

Graphene has attracted a lot of attention for ultracapacitor electrodes because of its high electrical conductivity, high surface area, and superb chemical stability. However, poor volumetric capacitive performance of typical graphene-based electrodes has hindered their practical applications because of the extremely low density. Herein we report a scalable synthesis method of holey graphene (h-Graphene) in a single step without using any catalysts or special chemicals. The film made of the as-synthesized h-Graphene exhibited relatively strong mechanical strength, 2D hole morphology, high density, and facile processability. This scalable one-step synthesis method for h-Graphene is time-efficient, cost-efficient, environmentally friendly, and generally applicable to other two-dimensional materials. The ultracapacitor electrodes based on the h-Graphene show a remarkably improved volumetric capacitance with about 700% increase compared to that of regular graphene electrodes. Modeling on individual h-Graphene was carried out to understand the excellent processability and improved ultracapacitor performance.

Original languageEnglish
Pages (from-to)8255-8265
Number of pages11
JournalACS Nano
Volume8
Issue number8
DOIs
StatePublished - Aug 26 2014

Keywords

  • dense graphene electrode
  • facile processability
  • holey graphene
  • scalable synthesis
  • supercapacitor
  • ultracapacitor
  • volumetric capacitance

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