Electrochemical Impedance Study of Membrane−Electrode Assemblies in PEM Fuel Cells. II. Electrooxidation of H2And H2/Co Mixtures on Pt/Ru-Based Gas-Diffusion Electrodes

1999 ◽  
Vol 103 (44) ◽  
pp. 9645-9657 ◽  
Author(s):  
Mariana Ciureanu ◽  
Hong Wang ◽  
Zhigang Qi
Keyword(s):  
Fuel Cells ◽  
Electrochemical Impedance ◽  
Pem Fuel Cells ◽  
Gas Diffusion ◽  
Membrane Electrode ◽  
Gas Diffusion Electrodes ◽  
Impedance Study ◽  
Membrane Electrode Assemblies ◽  
Electrode Assemblies

Characterization of Membrane Electrode Assemblies for High-Temperature PEM Fuel Cells

Fuel Cells ◽  
2016 ◽  
Vol 16 (5) ◽  
pp. 577-583 ◽  
Author(s):  
M. Rau ◽  
A. Niedergesäß ◽  
C. Cremers ◽  
S. Alfaro ◽  
T. Steenberg ◽  
...  
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Pem Fuel Cells ◽  
Membrane Electrode ◽  
Membrane Electrode Assemblies ◽  
Electrode Assemblies ◽  
High Temperature Pem

Manufacturing Implementation of Ultrasonic Sealing of Membrane Electrode Assemblies for High Temperature PEM Fuel Cells

2011 ◽  
Author(s):  
Jake M. Pyzza ◽  
William M. Sisson ◽  
Raymond Puffer
Keyword(s):  
Fuel Cells ◽  
Unit Cost ◽  
Pem Fuel Cell ◽  
Pem Fuel Cells ◽  
Membrane Electrode ◽  
Automated Production ◽  
Laboratory Setup ◽  
Membrane Electrode Assemblies ◽  
Electrode Assemblies ◽  
Production Cell

Early research has demonstrated the benefits of ultrasonically bonding PEM fuel cell Membrane Electrode Assemblies (MEAs), in terms of durability [2] and unit cost and cycle time [3]. With these improvements in performance, the next phase in the development of the process is to move from a laboratory setup to an automated production cell capable of producing larger volumes of fuel cells while maintaining a quality ultrasonic bond. The MEAs also need to be produced more affordably and with quality standards meeting or exceeding the level set by current best manufacturing practices.

scholarly journals Use of Electrochemical Impedance Spectroscopy for the Evaluation of Performance of PEM Fuel Cells Based on Carbon Cloth Gas Diffusion Electrodes

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Saverio Latorrata ◽  
Renato Pelosato ◽  
Paola Gallo Stampino ◽  
Cinzia Cristiani ◽  
Giovanni Dotelli
Keyword(s):  
Fuel Cells ◽  
Electrochemical Impedance Spectroscopy ◽  
Fuel Cell ◽  
Impedance Spectroscopy ◽  
Current Density ◽  
Electrochemical Impedance ◽  
Pem Fuel Cells ◽  
Gas Diffusion ◽  
Carbon Cloth ◽  
Gas Diffusion Electrodes

Polymer electrolyte membrane fuel cells (PEMFCs) have attracted great attention in the last two decades as valuable alternative energy generators because of their high efficiencies and low or null pollutant emissions. In the present work, two gas diffusion electrodes (GDEs) for PEMFCs were prepared by using an ink containing carbon-supported platinum in the catalytic phase which was sprayed onto a carbon cloth substrate. Two aerograph nozzles, with different sizes, were used. The prepared GDEs were assembled into a fuel cell lab prototype with commercial electrolyte and bipolar plates and tested alternately as anode and cathode. Polarization measurements and electrochemical impedance spectroscopy (EIS) were performed on the running hydrogen-fed PEMFC from open circuit voltage to high current density. Experimental impedance spectra were fitted with an equivalent circuit model by using ZView software which allowed to get crucial parameters for the evaluation of fuel cell performance, such as ohmic resistance, charge transfer, and mass transfer resistance, whose trends have been studied as a function of the applied current density.

scholarly journals Design Strategies for Alkaline Exchange Membrane–Electrode Assemblies: Optimization for Fuel Cells and Electrolyzers

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 686
Author(s):  
Aviv Ashdot ◽  
Mordechai Kattan ◽  
Anna Kitayev ◽  
Ervin Tal-Gutelmacher ◽  
Alina Amel ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Gas Diffusion ◽  
Ex Situ ◽  
Membrane Electrode ◽  
Device Performance ◽  
Membrane Electrode Assemblies ◽  
Electrode Assemblies ◽  
Interfacial Contact ◽  
Hydrogen Crossover ◽  
Exchange Membrane

Production of hydrocarbon-based, alkaline exchange, membrane–electrode assemblies (MEA’s) for fuel cells and electrolyzers is examined via catalyst-coated membrane (CCM) and gas-diffusion electrode (GDE) fabrication routes. The inability effectively to hot-press hydrocarbon-based ion-exchange polymers (ionomers) risks performance limitations due to poor interfacial contact, especially between GDE and membrane. The addition of an ionomeric interlayer is shown greatly to improve the intimacy of contact between GDE and membrane, as determined by ex situ through-plane MEA impedance measurements, indicated by a strong decrease in the frequency of the high-frequency zero phase angle of the complex impedance, and confirmed in situ with device performance tests. The best interfacial contact is achieved with CCM’s, with the contact impedance decreasing, and device performance increasing, in the order GDE >> GDE+Interlayer > CCM. The GDE+interlayer fabrication approach is further examined with respect to hydrogen crossover and alkaline membrane electrolyzer cell performance. An interlayer strongly reduces the rate of hydrogen crossover without strongly decreasing electrolyzer performance, while crosslinking the ionomeric layer further reduces the crossover rate though also limiting device performance. The approach can be applied and built upon to improve the design and production of alkaline, and more generally, hydrocarbon-based MEA’s and exchange membrane devices.

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