With Polymerized Sol A New, Ceramic Composite Nonwoven-Reinforced SPAES Proton Conductor for PEMFC Applications A New, Ceramic Composite Nonwoven-Reinforced SPAES Proton Conductor for PEMFC Applications 하효정, 안성용, 이상영 교수님 Energy Materials Lab. Department of Chemical Engineering. Kangwon National Univ. 하효정, 안성용, 이상영 교수님 Energy Materials Lab. Department of Chemical Engineering. Kangwon National Univ. I NTRODUCTION Proton Exchange Membrane Fuel Cells Anode : oxidation H 2 → 2H + + 2e - Cathode : reduction 2H + + 2e - + 1/2O 2 → H 2 O Overall reaction H 2 + 1/2O 2 → H 2 O Advantages : High Proton Conductivity Good Chemical & Thermal Stability Good Mechanical Properties Disadvantages : Expensive High Methanol Permeability Performance Above 80 ℃ Nafion TM  Increases the swelling of the membranes at lower relative humidity.  Increases the resistance to fuel crossover.  Increases the proton transport through the water phase Required Characteristics Sulfonated-poly(arylene ether sulfone) Advantages : Low Cost, Thermal Stability Good Mechanical Property High Proton Conductivity Disadvantages : High Water Uptake Low Dimensional Stability Objectives E XPERIMENTAL  Preparation of Ceramic Substrates Coating solution SiO 2 Silane EtOH HNO 3 Nonwoven (Kevlar) Ceramic substrate Dip Coating  Function of binding between SiO 2 and Nonwoven  Preparation of Fuel Cell Membrane by used Ceramic Substrates Silicon mold Dry  Silicon mold : dry ( 24hr, 60 ℃ )  Detach from the glass : distilled water  Dry : 2hr 80 ℃ and 2hr 80 ℃ vacuum  Characterization  Morphology : FE-SEM  Acidification (Ionic conductivity)  Dimensional Change, Water Uptake, Water Dehydration TSC 5% TSC 10% TSC 20% TSC 30%  Ceramic Substrates Morphology : FE-SEM Nonwoven (Kevlar) SiO 2  Acidification : Ionic Conductivity SPAES Impregnation  Membrane Morphology: FE-SEM Thickness (um)Impedance (S -1 ) Conductivity (S/cm) TEOS+SiO 2 +SPAES SPAES in boiling sulfuric acid 2hr in boiling distilled water 2hr Acidification  Water Dehydration R ESULT & D ISCUSSION  Water Uptake W wet (g) W dry (g) W wet -W dry Water uptake(%) TSC 5% TSC 10% TSC 20% TSC 30%  Dimensional Change A wet (cm 2 )A dry (cm 2 )A wet -A dry Dimensional change(%) TSC 5% TSC 10% TSC 20% TSC 30% SPAES S UMMARY We successfully developed a new, ceramic composite nonwoven-reinforced SPAES proton conductor for PEMFC applications. The ceramic composite nonwovens were prepared by conducting sol-gel synthesis of TEOS with SiO 2 nanoparticles in Kevlar-based nonwoven substrates. The ceramic composite nonwoven-reinforced SPAES proton conductor demonstrated significantly improved dimensional stability with slightly losing proton conductivity, compared to the pristine SPAES membrane.  To develop a new, ceramic composite nonwoven-reinforced SPAES proton conductor having superior dimensional stability for high-temperature PEMFC applications Preparation of ceramic composite nonwoven substrate Impregnation of SPAES into nonwoven substrates Characterization of reinforced SPAES proton conductors Sol-gel Reaction nonwoven SiO 2 Pore filling ratio (Φf) Porosity(Φp) Before impregnation After impregnation Detach from the glass