# Fileset

[20231016_Abstract Submission printed.pdf](https://mdr.nims.go.jp/filesets/e12067d1-5182-4b12-8e6d-a5a8f9cf671c/download)

## Creator

[金 済徳](https://orcid.org/0000-0003-4301-1044), Kazuya Yamasaki, Hitoshi Ishimoto

## Rights

© The Electrochemical 
Society, Inc. 2023. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, r esold, 
distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival ver sion of this  work 
was published in https://ecs.confex.com/ecs/244/meetingapp.cgi/Paper/181450[In Copyright](http://rightsstatements.org/vocab/InC/1.0/)

## Other metadata

[Thin Membranes using PFSA-Vinylon Intermediate Layer for PEM Fuel Cells](https://mdr.nims.go.jp/datasets/07d16df0-7bae-43b8-867e-85636418d97f)

## Fulltext

Submission ProofThin Membranes Using PFSA-Vinylon Intermediate Layer for PEM Fuel CellsJ. Kim (National Institute for Materials Science), K. Yamasaki, and H. Ishimoto (Panasonic)Abstract Text:Fuel cells are attracting attention as one of the key energy devices for achieving carbon neutrality in 2050.Currently, fuel cells are being improved for versatile mobile applications. Among the components of fuelcell devices, polymer electrolyte membranes for proton exchange, in particular, are required to have highproton conductivity at high temperature, high and low humidification, and thin membranes. Proton-exchange fuel cells utilize perfluorosulfonic acid (PFSA) ionomers and membranes from Chemours and3M and Solvay [1]. Nafion membranes with a thickness of 178-25 μm and Gore select membranes (withreinforcement) with a thickness of 20-5 μm have been commercialized [2,3]. On the other hand, thinnerpolymer electrolyte membranes can reduce the ohmic voltage drop in fuel cells to improve performanceand lower costs. However, it is difficult to obtain thin membranes of less than 20 μm without reinforcementusing PFSA ionomers.In this report, a thin PFSA electrolyte membrane (10 μm) without reinforcement was successfullydeveloped by introducing a PFSA-vinilon composite layer as an intermediate layer of the PFSAmembrane. The fuel cell evaluation revealed that it has a high current density.The ionomers used were 5% Nafion solution (DE520 CS type, EW=1100) and 6% Aquivion solution (D83-06A, EW=830). PVA (polyvinyl alcohol) was synthesized from polyvinyl acetate (PVAc, Mw=100,000). Thelaminated membranes (10 μm thickness) was obtained by preparing a 2 μm PFSA layer, followed by a 6μm PFSA-PVA composite layer, then a 2 μm PFSA layer was coated. Finally, laminated membranes withPFSA-Vinylon composite layers were obtained by Formalization reaction the PFSA-PVA composite layers.FTIR evaluation of the PFSA/ PFSA-Viynylon/ PFSA multilayers confirmed the presence of anintermediate layer by observing Vinylon-derived peaks. Conductivities of about 4.5 mS/cm and 2.5 mS/cmin the thickness direction were obtained at 80°C, 90%RH and 20%RH, respectively. On the other hand, I-Vevaluation was performed at 80°C, 100%RH and 35%RH using hydrogen, oxygen and air. Nafion 212 wasused as a comparison membrane. The I-V characteristics of the laminated membranes showed highercurrent density than that of the Nafion membrane. Maximum current densities of 3 A/cm2 at 0.6 V and 3A/cm2 at 0.4 V were obtained at 80°C, 100% RH and 35% RH with hydrogen and oxygen, respectively.Regarding the comparison of PFSA ionomers, Aquivion showed higher performance at higher currentdensities than Nafion [4].References[1] A. Kusoglu, A.Z. Weber, Chem. Rev. 2017, 117, 987–1104.[2] J.A. Kolde, B. Bahar, M.S. Wilson, T.A. Zawodzinski, S. Gottesfeld, Electrochem. Soc. Proc. 1995, 95-23, 193–201.[3] B. Kienitz, J.Kolde, S. Priester, C.Baczkowski, M. Crum, Electrochem. Soc. Trans. 2011, 41(1) 1521-1530.[4] J. Kim, K. Yamazaki, H. Ishimoto, Y. Takata, Polymers, 2020, 12, 1730-1735.