期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 40, 期 36, 页码 12506-12511出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.07.061
关键词
Corrosion; Membrane electrode assembly; Proton exchange membrane electrolyzer/fuel cells; Gas diffusion layer; X-ray diffraction; Iron transport and deposition
资金
- U.S. Department of Energy's National Energy Technology Laboratory [DE-FE0011585]
- U.S. Department of Energy Fuel Cell Technologies Office [DE-EE0000276]
The lack of a fundamental understanding of the corrosion mechanisms in the electro-chemical environments of proton exchange membrane (PEM) electrolyzer and/or fuel cells (ECs/FCs) has seriously hindered the improvement of performance and efficiency of PEM ECs/FCs. In this study, a stainless steel mesh was purposely used as an anode gas diffusion layer that was intentionally operated with high positive potentials under harsh oxidative environments in a PEMEC to study the corrosion mechanism of metal migration. A significant amount of iron and nickel cations were determined to transport through the anode catalyst layer, the PEM and the cathode catalyst layer during the PEMEC operation. The formation/deposition of iron oxide and nickel oxide on the carbon paper gas diffusion layer at the cathode side is first revealed by both scanning electron microscope and X-ray diffraction. The results indicate the corrosion elements of iron and nickel are transported from anode to cathode through the catalyst-coated membrane, and deposited on carbon fibers as oxides. This phenomenon could also open a new corrosion-based processing approach to potentially fabricate multifunctional oxide structures on carbon fiber devices. This study has demonstrated a new accelerated test method for investigating the corrosion and durability of metallic materials as well. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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