Scalable fabrication of micron-scale graphene nanomeshes for high-performance supercapacitor applications

Hyun Kyung Kim, Seong Min Bak, Suk Woo Lee, Myeong Seong Kim, Byeongho Park, Su Chan Lee, Yeon Jun Choi, Seong Chan Jun, Joong Tark Han, Kyung Wan Nam, Kyung Yoon Chung, Jian Wang, Jigang Zhou, Xiao Qing Yang, Kwang Chul Roh, Kwang Bum Kim

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Abstract

Graphene nanomeshes (GNMs) with nanoscale periodic or quasi-periodic nanoholes have attracted considerable interest because of unique features such as their open energy band gap, enlarged specific surface area, and high optical transmittance. These features are useful for applications in semiconducting devices, photocatalysis, sensors, and energy-related systems. Here, we report on the facile and scalable preparation of multifunctional micron-scale GNMs with high-density of nanoperforations by catalytic carbon gasification. The catalytic carbon gasification process induces selective decomposition on the graphene adjacent to the metal catalyst, thus forming nanoperforations. The pore size, pore density distribution, and neck size of the GNMs can be controlled by adjusting the size and fraction of the metal oxide on graphene. The fabricated GNM electrodes exhibit superior electrochemical properties for supercapacitor (ultracapacitor) applications, including exceptionally high capacitance (253 F g-1 at 1 A g-1) and high rate capability (212 F g-1 at 100 A g-1) with excellent cycle stability (91% of the initial capacitance after 50000 charge/discharge cycles). Further, the edge-enriched structure of GNMs plays an important role in achieving edge-selected and high-level nitrogen doping.

Original languageEnglish
Pages (from-to)1270-1281
Number of pages12
JournalEnergy and Environmental Science
Volume9
Issue number4
DOIs
Publication statusPublished - 2016 Apr 1

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All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

Cite this

Kim, H. K., Bak, S. M., Lee, S. W., Kim, M. S., Park, B., Lee, S. C., Choi, Y. J., Jun, S. C., Han, J. T., Nam, K. W., Chung, K. Y., Wang, J., Zhou, J., Yang, X. Q., Roh, K. C., & Kim, K. B. (2016). Scalable fabrication of micron-scale graphene nanomeshes for high-performance supercapacitor applications. Energy and Environmental Science, 9(4), 1270-1281. https://doi.org/10.1039/c5ee03580e