Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Effect of O2 Plasma Treatment on Electrochemical Performance of Supercapacitors Fabricated with Polymer Electrolyte Membrane

고분자 전해질막으로 제조한 슈퍼커패시터의 전기화학적 특성에 대한 산소 플라즈마 처리 영향

  • Moon, Seung Jae (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Kim, Young Jun (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Kang, Du Ru (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Lee, So Youn (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Kim, Jong Hak (Department of Chemical and Biomolecular Engineering, Yonsei University)
  • 문승재 (연세대학교 화공생명공학과) ;
  • 김영준 (연세대학교 화공생명공학과) ;
  • 강두루 (연세대학교 화공생명공학과) ;
  • 이소연 (연세대학교 화공생명공학과) ;
  • 김종학 (연세대학교 화공생명공학과)
  • Received : 2021.12.25
  • Accepted : 2022.01.12
  • Published : 2022.02.28
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Abstract

Solid-state supercapacitors with high safety and robust mechanical properties are attracting global attention as next-generation energy storage devices. As an electrode of a supercapacitor, an economical carbon-based electrode is widely used. However, when an aqueous electrolyte is introduced, the charge transfer resistance increases because the interfacial contact between the hydrophobic electrode surface and aqueous electrolyte is not good. In this regard, we propose a method to obtain higher electrochemical performance based on improved interfacial properties by treating the electrode surface with oxygen plasma. The surface hydrophilization induced by the enriched oxygen functionalities was confirmed by the contact angle measurement. As a result, the degree of hydrophilization was easily adjusted by controlling the power and duration of the oxygen plasma treatment. As the electrolyte of the supercapacitor, PVA/H3PO4, which is a typical solid-state aqueous electrolyte, was used. Free-standing membranes of PVA/H3PO4 electrolyte were prepared and then pressed onto the electrode. The optimal condition was to perform oxygen plasma treatment for 5 seconds with a low power of 15 W, and the energy density of the supercapacitor increased by about 8%.

높은 안전성과 견고한 기계적 특성을 가진 고체상 슈퍼커패시터는 차세대 에너지 저장 장치로서 세계적 관심을 끌고 있다. 슈퍼커패시터의 전극으로서 경제적인 탄소 기반 전극이 많이 사용되는데 수계 전해질을 도입하는 경우 소수성 표면을 가진 탄소 기반 전극과의 계면 상호성이 좋지 않아 저항이 증가한다. 이와 관련하여 본 연구에서는 전극 표면에 산소 플라즈마 처리를 하여 친수화된 전극과 수계 전해질 사이의 향상된 계면 성질을 기반으로 더 높은 전기화학적 성능을 얻는 방법을 제시한다. 풍부해진 산소 작용기들로 인한 표면 친수화 효과는 접촉각 측정을 통해 확인하였으며, 전력과 지속시간을 조절함으로써 친수화 정도를 손쉽게 조절할 수 있음을 확인하였다. 수계 전해질로 PVA/H3PO4 고체상 고분자 전해질막을 사용하였으며 프레싱하여 전극에 도입하였다. 15 W의 낮은 전력으로 5초간 산소 플라즈마 처리를 시행하는 것이 최적 조건이었으며 슈퍼커패시터의 에너지 밀도가 약 8% 증가하였다.

Keywords

Acknowledgement

This work was supported by a National Research Foundation (NRF) of South Korea grant funded by the Ministry of Science, ICT, and Future Planning (NRF-2018M3A7B4071535, NRF-2017R1D1A1B06028030).

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