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Analysis of platinum particle size and oxygen reduction in phosphoric acid

โœ Scribed by N. Giordano; E. Passalacqua; L. Pino; A.S. Arico; V. Antonucci; M. Vivaldi; K. Kinoshita

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
718 KB
Volume
36
Category
Article
ISSN
0013-4686

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โœฆ Synopsis

The influence of particle size on the reduction of oxygen on supported platinum (Pt) electrocatalysts (Pt on carbon black) in phosphoric acid was investigated. The results confirm earlier evidence that indicates the mass activity (A g-' Pt) and specific activity bA cmm2 Pt) of Pt at 900 mV (us rhe) change with particle size in a manner which corresponds to the change in the relative fraction of Pt surface atoms on the ( 111) and ( 100) faces of the Pt particle, assuming a c&o-octahedral geometry. It is further concluded from the measurements in this study, and from some published data, that the interparticle separation distance between Pt particles on the carbon support is not the factor controlling the activity of Pt for oxygen reduction.

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