Performance evaluation of porous electrocatalysts via normalization of the active surface |
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Authors: | JP Iúdice de Souza T Iwasita FC Nart W Vielstich |
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Affiliation: | (1) Instituto de Química de São Carlos, Universidade de São Paulo, C.P. 780, 13560-970 São Carlos, Brazil;(2) Instituto de Química de São Carlos, Universidade de São Paulo, C.P. 780, 13560-970 São Carlos, Brazil;(3) Institut für Physik, Universität der Bundeswehr, München, Werner-Heisenberg-Weg 39, 85577 Neubiberg, Germany;(4) Present address: Instituto de Química de São Carlos, Univesidade de São Paulo, C.P. 780, 13560-970 São Carlos, Brazil |
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Abstract: | When comparing the rate of electrochemical processes at different porous electrocatalysts a surface normalization should be used. It is shown for the case of methanol oxidation at PtRu layers electrodeposited on gold substrates that substantially different data are obtained for current, mass spectrometry signals and integrated IR band intensities of the products, with and without normalization of the catalyst surface used. Using stripping of saturated CO coverage as a normalization tool, cyclic voltammograms, on line MS and in situ FTIR spectroscopy give reasonable agreement of catalytic activity towards methanol oxidation.On leave from: Departamento de Química, Universidade Federal do Pará, Rua Augusto Correa S/N, Belém, Pará, Brazil |
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Keywords: | methanol electrooxidation normalization of porous surfaces PtRu catalysts |
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