Effect of TiO[sub 2] Surface Properties on Performance of Nafion-Based Composite Membranes in High Temperature and Low Relative Humidity PEM Fuel Cells
Open Access
- 1 January 2005
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 152 (9), A1742-A1747
- https://doi.org/10.1149/1.1971216
Abstract
Nafion∕10% (mass % is used in this paper) TiO2TiO2 composite membranes were studied in a H2∕O2H2∕O2 proton exchange membrane (PEM) fuel cell over a range of relative humidity (RH) from 26 to 50% at temperatures of 80 and 120°C120°C . According to the scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) structural analysis, the composite Nafion∕TiO2Nafion∕TiO2 membranes had a two-layer structure, one layer enriched with TiO2TiO2 particles, and the other dominated by the Nafion polymer. Although the TiO2TiO2 particles were mainly concentrated on one side of the composite membrane, sufficient hydration was apparently achieved for the whole membrane. Two TiO2TiO2 (rutile) powders used for the preparation of the composite membranes differed in specific surface area (SSA), surface zeta potential, and particle morphology. A TiO2TiO2 powder with five times higher SSA, 22mV22mV higher zeta potential (at the low-pH limit), and distinctly different individual particle and particle aggregate morphologies resulted in a four-times increase of current density (at 0.6V0.6V ) when the composite membranes were made and tested in PEM fuel cell at temperature of 120°C120°C and relative humidity of 26%. We speculate that a greater number of protonated sites per unit mass of powder in the membrane and a higher density of the protonated sites contribute to the enhanced fuel cell performance.This publication has 17 references indexed in Scilit:
- Nafion∕TiO[sub 2] Proton Conductive Composite Membranes for PEMFCs Operating at Elevated Temperature and Reduced Relative HumidityJournal of the Electrochemical Society, 2005
- Approaches and Recent Development of Polymer Electrolyte Membranes for Fuel Cells Operating above 100 °CChemistry of Materials, 2003
- Composite Membranes for Medium-Temperature PEM Fuel CellsAnnual Review of Materials Research, 2003
- Investigation of PEMFC operation above 100 °C employing perfluorosulfonic acid silicon oxide composite membranesJournal of Power Sources, 2002
- Nafion® 115/zirconium phosphate composite membranes for operation of PEMFCs above 100°CElectrochimica Acta, 2002
- Silicon Oxide Nafion Composite Membranes for Proton-Exchange Membrane Fuel Cell Operation at 80-140°CJournal of the Electrochemical Society, 2002
- Suppression of Methanol Crossover and Distribution of Ohmic Resistance in Pt-Dispersed PEMs under DMFC OperationJournal of the Electrochemical Society, 2002
- Composite Nafion/Zirconium Phosphate Membranes for Direct Methanol Fuel Cell Operation at High TemperatureElectrochemical and Solid-State Letters, 2001
- Investigation of a direct methanol fuel cell based on a composite Nafion®-silica electrolyte for high temperature operationSolid State Ionics, 1999
- Comparison of Ethanol and Methanol Oxidation in a Liquid-Feed Solid Polymer Electrolyte Fuel Cell at High TemperatureElectrochemical and Solid-State Letters, 1999