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Water-oxidized and ball-milled reduced graphene oxide based self-supporting electrodes for high performance flexible supercapacitors

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2025, 35(6), pp.2729~2740
  • DOI : 10.1007/s42823-025-00950-2
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : February 27, 2025
  • Accepted : July 8, 2025
  • Published : December 11, 2025

Jung Jae Young 1 Kim Dong-gun 2 Jung Sungkwon 2 김수진 2 Kang Jae-yeong 2 Park Yong-seong 2 Kim Hongbum 3 Kim, Nam Dong 3 Kim Pil 2

1한국에너지기술연구원
2전북대학교
3한국과학기술연구원

Accredited

ABSTRACT

With the increasing demand for flexible electronic devices, smaller and lighter flexible supercapacitors have gained significant research attention. Among the various materials, self-supporting reduced graphene oxide (rGO) paper has emerged as one of the most promising electrode materials for supercapacitors due to its low cost, high chemical/thermal stability, and excellent electrical conductivity. Nevertheless, a major drawback of rGO paper is the limited ion diffusion between stacked rGO layers, hindering the effective formation of electrochemical double-layer at the electrode/electrolyte interface. In this study, we prepared the rGO paper derived from ball-milled followed-by water oxidation process for reducing the sheet size. The smaller-sized rGO sheets facilitated ion transport between graphene layers, promoting efficient electric double-layer formation. Moreover, the increased presence of edge planes in ball-milled rGO sheets achieved high capacitance, further enhancing the performance of rGO as an electrode material. Notably, the 2-BMOX rGO paper obtained from ball-milling and wet-oxidized graphite exhibited a capacitance of 117.9 F/g in cyclic voltammetry (CV) and 128.6 F/g in galvanostatic charge–discharge (GCD) tests, approximately twice that of conventional rGO. Additionally, the capacitance retained 91% of its initial performance after 2,000 cycles, indicating excellent cycling stability.

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