Abstract
We prepared ultrathin PFSA/PFSA-vinylon/PFSA laminated electrolyte membranes (thickness = 10 μm) for fuel cells without using a reinforcing material. Nafion and Aquivion solutions were used as PFSA polymers. Vinylon was synthesized by formalizing polyvinyl alcohol. From the current-voltage measurements using ultrathin PFSA/PFSA-vinylon/PFSA membranes; the cell resistances are significantly lower than that using a 50 μm Nafion membrane. A high current density was obtained under both low- and high-humidity conditions. Ultrathin PFSA/PFSA-vinylon/PFSA laminated membranes will help to further improve the performance of PEMFCs.
Highlights
Fuel cells, water electrolysis devices, secondary batteries, redox flow batteries (RFBs), solar cells, etc., are attracting attention as important energy devices for realizing a CO2 -free society.Research to improve the performance of these devices and systems is actively being conducted.The performance and durability of fuel cells have been improving while their system costs have reduced, and they are being used in mobile and stationary applications
We developed laminated ultrathin membranes that could be handled even when the thickness was
From the I–V evaluation of the fuel cells using the ultrathin membranes, the cell resistances were low in comparison to those using the Nafion212 membrane, perfluorosulfonic acid (PFSA)/PFSA-vinylon/PFSA membranes, the cell resistances were low in comparison to those using and high performances were obtained
Summary
Water electrolysis devices, secondary batteries, redox flow batteries (RFBs), solar cells, etc., are attracting attention as important energy devices for realizing a CO2 -free society. Thinning the polymer electrolyte membrane can improve the performance by reducing the ohmic voltage drop of the fuel cell and can reduce the cost. The GORE-SELECT® membrane, which uses expanded polytetrafluoroethylene (ePTFE) as a reinforcing material, is a thin membrane that can be handled reliably and has a high durability, but it is costly [3,4,5]. There are no reports of fuel cell evaluation using an ultrathin PFSA membrane of 10 μm or less without a reinforcing material In this communication, we prepared an ultrathin laminated membrane of PFSA/PFSA-vinylon/PFSA that could be handled even when the thickness was under 10 μm by inserting a PFSA-vinylon composite layer between PFSA electrolyte membranes. It was determined to have a high current density from fuel cell evaluations
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