NDLI: Electrochemical and impedance spectroscopy studies in H$_{2}$/O$_{2}$ and methanol/O$

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Electrochemical and impedance spectroscopy studies in H$_{2}$/O$_{2}$ and methanol/O$_{2}$ proton exchange membrane fuel cells

Content Provider	Springer Nature Link
Author	Santos, Antonio Rodolfo Carmo, Marcelo Oliveira Neto, Almir Spinacé, Estevam V. Rocha Poço, João G. Roth, Christina Fuess, Hartmut Linardi, Marcelo
Copyright Year	2007
Abstract	This works report results of the structural and the electrochemical characterization of membrane electrode assemblies (MEA) for proton exchange membrane fuel cells (PEMFC) under various cell conditions using different MEA production processes. Electrochemical impedance spectroscopy (EIS) was applied “on-line” (in situ) as a tool for diagnosis concerning the cell performance. MEA with a 25-cm$^{2}$ surface area were prepared using Pt/C and Pt–Ru/C commercial electrocatalysts from E-TEK and Pt–Ru/C electrocatalysts produced by the alcohol reduction process. The catalytic ink was applied directly onto the carbon cloth or, alternatively, onto the Nafion® membrane. Two carbon cloth thicknesses were tested as diffusion layers in the MEA: 0.346 mm (common) and 0.424 mm (ELAT). An increase of the electrocatalytic activity can be obtained by pH control in the alcohol reduction process, possibly due to the better particle dispersion and the smaller particle sizes observed. In addition, a slower current decay in the ohmic region was observed using the thinner carbon cloth. This can be related to a lower resistance of the gas flow through the cloth to the catalytic active layer. Different types of methanol feed were employed in the experiments: by humidification and by evaporation. The results showed that the choice of suitable methods for catalyst preparation as well as for MEA production enhance PEMFC performance.
Starting Page	43
Ending Page	51
Page Count	9
File Format	PDF
ISSN	09477047
Journal	Ionics
Volume Number	14
Issue Number	1
e-ISSN	18620760
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-07-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pt Pt–Ru PEMFC DMFC EIS XRD TEM SEM Electrical Power Generation and Transmission Renewable Energy Sources Condensed Matter Physical Chemistry Materials Science Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Engineering Materials Science Chemical Engineering

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Carbon supported Ru–Se as methanol tolerant catalysts for DMFC cathodes. Part II: preparation and characterization of MEAs

Highly Integrated Online Multi-Channel Electrochemical Impedance Spectroscopy Measurement Device for Fuel Cell Stack

Characterization of different Pt/Metal/Complex catalysts as anode catalysts for the PEM fuel cell

Electro-osmotic drag of methanol in proton exchange membranes

H$_{2}$/Pt/Ce$_{0.9}$Gd$_{0.1}$O$_{1.95}$/Pt/O$_{2}$ fuel cell operated in the intermediate temperature range 500 – 700°C

Impedance monitoring of fuel cell stacks

Electrochemical impedance analysis of methanol oxidation on carbon nanotube-supported Pt and Pt-Ru nanoparticles

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Oxygen diffusion impedance in proton exchange membrane fuel cells – insights into electrochemical impedance spectra and equivalent electrical circuit modeling

Electrochemical and impedance spectroscopy studies in H$_{2}$/O$_{2}$ and methanol/O$_{2}$ proton exchange membrane fuel cells

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