Propylene carbonate-derived size modulation of water cluster in pore-filled nafion/polypropylene composite membrane for the use in vanadium redox flow batteries = 프로필렌 카보네이트를 이용한 나피온/폴리프로필렌 강화막 내 물 전달 채널 크기 제어 및 바나듐 레독스 흐름 전지 적용 방안에 관한 연구

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There is an increasing need to develop an alternative to conventional Nafion membrane in order to reduce the cost of vanadium redox flow batteries (VRFBs). Pore-filled composite membranes based on Nafion is one way to reduce the amount of costly material, however the chronic problem of this approach is low conductivity and low water uptake ability of the composite membrane. In this work, we suggest a novel approach to enhance the conductivity and water uptake by incorporating propylene carbonate (PC) in pore-filled Nafion phase to modulate morphologies of the water channel in Nafion directly. Small-angle X-ray scattering shows that the PC enlarges the water cluster in a Nafion membrane by 25% of its original size. Intermolecular interactions inside the water nanocluster between PC and sulfonic acid group, which is responsible for the expansion of the water cluster, are elucidated by molecular dynamics simulations. We present a pore-filled type Nafion composite membrane based on a porous polypropylene (PP) substrate to prove the effect of PC addition and demonstrate that the PC-derived Nafion/PP membrane has a similar membrane resistance and reduced vanadium crossover compared with a commercial Nafion membrane. We suggest that the PC-derived Nafion structure modulation could be a facile and effective approach to improve transport properties of Nafion-based membranes for VRFB applications.
Kim, Hee-Takresearcher김희탁researcher
한국과학기술원 :생명화학공학과,
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학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2018.2,[ii, 31 p. :]


Pore-filled membrane▼avanadium redox flow batteries▼apolypropylene microporous membrane▼aNafion▼awater cluster; 기공충진형 분리막▼a바나듐 레독스 흐름 배터리▼a폴리프로필렌 다공성막▼a나피온▼a물 전달 채널

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