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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 17:46 |
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Conference: Bucharest University Faculty of Physics 2014 Meeting
Section: Physics and Technology of Renewable and Alternative Energy Sources
Title:
Nanocomposite Nafion/TiO2 membranes for proton exchange membrane fuel cells
Authors:
Daniela I.EBRAȘU(1), G. DORCIOMAN(2), E. AXENTE(2), L. PATULARU(1), E. CARCADEA(1), M. VARLAM(1), A. SOARE(1), S. ENACHE(1), Adriana BĂLAN(3), I. N. MIHĂILESCU(2), I. ȘTEFĂNESCU(1), I. STAMATIN(3), A. VASEASTHA(4)
Affiliation:
1)National Research and Development Institute for Cryogenics and Isotopic Technologies - ICSI Rm. Valcea, National Center for Hydrogen&Fuel Cells P.O. Box 10, 240050, ROMANIA
2)Lasers Department, National Institute for Lasers, Plasma and Radiations Physics, 409 Atomistilor Street, PO Box MG-54, RO-77125, Magurele, Ilfov, ROMANIA
3)University of Bucharest,Faculty of Physics-3Nano-Sae Research Center
4)Institute for Advanced Sciences Convergence and International Clean Water Institute NUARI, 13873 Park Center Rd. Suite 500, Herndon VA USA & U.S. Department of State, Washington, DC USA
E-mail
daniela.ebrasu@icsi.ro
Keywords:
Nafion, Laser Ablation, PEM Fuel Cells
Abstract:
Nafion/oxide composite membranes were produced by pulsed laser ablation method using UV laser pulses generated by a COMPEXPro 205 KrF* excimer laser source λ = 248 nm and tFWHM ≈ 25 ns. We selected TiO2 material and distributed it uniformly over the surface of Nafion 112 membrane using 100, 250 and 500 laser pulses and an incident laser fluence set at 5 J cm−2 were applied to improve the water retention property and corresponding proton conductivity under high temperature operating conditions. UV-Vis spectroscopy, scanning electron microscopy and Energy Dispersive X-Ray Spectroscopy (EDS) tests indicated the oxides distribution in the composite membranes. Proton conductivity characterization was carried out in the temperature range of 40-120°C, and water uptake was measured at 25 and 80°C. The results proved an increased proton conductivity of the composite membranes compared with Nafion 112 membrane at 120°C, and higher water uptake at 25 and 80°C. Finally, the composite membranes functionality was tested by current-voltage measurements using a home-made 11.3 cm2 active area fuel cell.
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