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Preparation of electrochemically exfoliated graphene sheets using DC switching voltages

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2020, 30(4), pp.409-416
  • DOI : 10.1007/s42823-019-00110-3
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : August 14, 2019
  • Accepted : November 6, 2019
  • Published : August 1, 2020

Lim Sungmook 1 HAN, Jonghun 1 Kang, Hyun Wook 1 Lee Jea Uk 2 Lee Wonoh 1

1전남대학교
2경희대학교

Accredited

ABSTRACT

Among various methods to produce graphene sheets, electrochemical exfoliation has been regarded as an efective method for the mass production of high-quality graphene sheets because of its simplicity and environmental friendliness. However, conventional electrochemical exfoliation has a disadvantage of accumulating intercalating ions at graphite interlayers owing to the use of a constant voltage. In this study, we developed a DC switching technique to achieve more efcient intercalation of ions than that in the conventional method. In the DC switching method, positive and negative voltages are successively applied to release the accumulated intercalating ions. By testing various conditions, we found the optimum switching time to produce high-quality graphene sheets with the highest yield rate and the highest electrical conductivity. As a result, the graphene sheets using this DC switching technique showed 85% higher yield rate, 193% higher electrical conductivity, 160% larger area, and 25% thinner thickness than those obtained when using a constant DC method. We believe that this DC switching technique can be used for large-scale production of high-quality graphene sheets.

Citation status

This is the result of checking the information with the same ISSN, publication year, volume, and start page between the WoS and the KCI journals. (as of 2024-07-28)

Total Citation Counts(KCI+WOS) (9) This is the number of times that the duplicate count has been removed by comparing the citation list of WoS and KCI.

Scopus Citation Counts (11) This is the result of checking the information with the same ISSN, publication year, volume, and start page between articles in KCI and the SCOPUS journals. (as of 2025-01-01)

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