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Investigation of structure and ORR reactivity of fuel cell catalysts by in-situ STM

Hiesgen, Renate and Eberhardt, Dirk and Alexandrova, Elena and Friedrich, Kaspar Andreas (2007) Investigation of structure and ORR reactivity of fuel cell catalysts by in-situ STM. Journal of Applied Electrochemistry, 37, pp. 1495-1502. DOI: 10.1007/s10800-007-9400-7

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Abstract

In order to provide insight into the interfacial relationships at fuel cell electrodes, a measuring technique based on a scanning tunneling microscope working in an electrochemical cell has been developed. The structure of model electrodes consisting of carbon supported Pt and ionomer mixtures as well as MEA electrode surfaces is imaged by the electrochemical scanning tunneling microscope (EC-STM) from microscale to nanoscale. Images with subnanometer resolution are obtained indicating that some ordering of the particles on the carbon support is present in the model system and in the MEA. It is demonstrated that in both cases nanometer structures can be imaged reliably and that the interface is rather clean and active under reaction conditions. In addition, a technique has been developed to measure the local reactivity by using the STM tip as a sensor electrode for the ORR.

Item URL in elib:https://elib.dlr.de/51583/
Document Type:Article
Title:Investigation of structure and ORR reactivity of fuel cell catalysts by in-situ STM
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hiesgen, RenateHochschule EsslingenUNSPECIFIED
Eberhardt, DirkHochschule EsslingenUNSPECIFIED
Alexandrova, ElenaUniversität StuttgartUNSPECIFIED
Friedrich, Kaspar AndreasUNSPECIFIEDUNSPECIFIED
Date:9 September 2007
Journal or Publication Title:Journal of Applied Electrochemistry
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:37
DOI :10.1007/s10800-007-9400-7
Page Range:pp. 1495-1502
Editors:
EditorsEmail
Springer, UNSPECIFIED
Status:Published
Keywords:Electrochemical scanning tunneling microscopy, platinum nanoparticles, fuel cell, oxygen reduction reaction
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E VG - Combustion and Gas Turbine Technologies (old)
DLR - Research area:Energy
DLR - Program:E VG - Combustion and Gas Turbine Technologies
DLR - Research theme (Project):E - Brennstoffe (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:11 Dec 2007
Last Modified:12 Dec 2013 20:28

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