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The Membrane Society of Korea (한국막학회)
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Reinforced Anion-exchange Membranes Employing Porous PTFE Support for All-vanadium Redox Flow Battery Application

전 바나듐 레독스 흐름전지 응용을 위한 다공성 PTFE 지지체를 사용한 강화 음이온교환막

  • Moon, Ha-Nuel (Department of Green Chemical Engineering, Sangmyung University) ;
  • Song, Hyeon-Bee (Department of Green Chemical Engineering, Sangmyung University) ;
  • Kang, Moon-Sung (Department of Green Chemical Engineering, Sangmyung University)
  • 문하늘 (상명대학교 그린화학공학과) ;
  • 송현비 (상명대학교 그린화학공학과) ;
  • 강문성 (상명대학교 그린화학공학과)
  • Received : 2021.10.18
  • Accepted : 2021.10.27
  • Published : 2021.10.31
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Abstract

All-vanadium redox flow battery (VRFB) is one of the promising high-capacity energy storage technologies. The ion-exchange membrane (IEM) is a key component influencing the charge-discharge performance and durability of VRFB. In this study, a pore-filled anion-exchange membrane (PFAEM) was fabricated by filling the pores of porous polytetrafluoroethylene (PTFE) support with excellent physical and chemical stability to compensate for the shortcomings of the existing hydrocarbon-based IEMs. The use of a thin porous PTFE support significantly lowered the electrical resistance, and the use of the PTFE support and the introduction of a fluorine moiety into the filling ionomer significantly improved the oxidation stability of the membrane. As a result of the evaluation of the charge-discharge performance, the higher the current efficiency was seen by increasing the fluorine content in the PFAEM, and the superior voltage and energy efficiencies were shown owing to the lower electrical resistance compared to the commercial membrane. In addition, it was confirmed that the use of a hydrophobic PTFE support is more preferable in terms of oxidation stability and charge-discharge performance.

전 바나듐 레독스 흐름 전지(VRFB)는 유망한 대용량 에너지 저장 기술 중 하나이다. 이온교환막은 VRFB의 충·방전 성능 및 내구성을 좌우하는 핵심 구성 요소이다. 본 연구에서는 기존 탄화수소계 이온교환막의 단점을 보완하기 위해 우수한 물리적 및 화학적 안정성을 갖는 다공성 폴리테트라플루오로에틸렌(PTFE) 지지체의 세공에 불소부가 포함된 탄화수소계 이오노머를 충진하는 방식으로 세공충진 음이온교환막(PFAEMs)을 제조하였다. 얇은 다공성 PTFE 지지체의 사용으로 전기적 저항을 현저히 낮출 수 있었으며 PTFE 지지체의 사용과 더불어 충진 이오노머에 불소부를 도입함으로써 막의 산화 안정성을 크게 향상시킬 수 있었다. 충·방전 성능 평가 결과, PFAEM에 불소부의 함량이 증가할수록 높은 전류 효율을 나타내었으며 낮은 전기적 저항으로 상용막 대비 우수한 전압 효율 및 에너지 효율을 보였다. 또한, 산화 안정성 및 충·방전성능의 관점에서 소수성 PTFE 지지체의 사용이 더 바람직함을 확인하였다.

Keywords

Acknowledgement

본 연구는 2020학년도 상명대학교 교내연구비를 지원받아 수행하였음.

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