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Activity of PtRuMeOx (Me = W, Mo or V) catalysts towards methanol oxidation and their characterization by Z Jusys; T.J Schmidt; L Dubau; K Lasch; L Jörissen; J Garche; R.J Behm is a Engineering article available to read on EtoBox.

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The activity of unsupported ternary PtRuMeO x (Me W, Mo, V) high surface area catalysts towards methanol oxidation under fuel cell relevant conditions, at constant potential and elevated temperature of 60 8C, was investigated by the thin-®lm electrode method. COstripping experiments for actual surface area detection, using differential electrochemical mass spectrometry (DEMS) to evaluate the amount of adsorbed CO, show that the electrochemically active area of the particle surface is signi®cantly smaller than the total particle surface area determined by N 2 BET measurements, indicating that part of their surface consists of MeO x . The speci®c surface activity of the catalysts towards methanol oxidation at 60 8C, normalized to the current density per square centimeter of electrochemically active noble metal surface, decreases in the order PtRuVO x > PtRuMoO x > PtRu > PtRuWO x PtRu (E-TEK). Apparently, the surface oxide leads to an acceleration of the methanol oxidation reaction, which is, however, partly compensated by a decrease in active surface area.

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Author

Z Jusys; T.J Schmidt; L Dubau; K Lasch; L Jörissen; J Garche; R.J Behm

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0378-7753)

Published

2002

Language

EN

Field

Engineering (Physical Sciences)