2 research outputs found
Reasons for the Differences in the Kinetics of Thermal Oxidation of the Support in Pt/C Electrocatalysts
High-temperature oxidation processes
of carbon microparticles Vulcan XC72 coated with platinum nanoparticles
(Pt/C) were studied by thermogravimetric analysis (TGA) and differential
scanning calorimetry (DSC). The presence of different specific temperature
ranges in the oxidation of carbon support was shown to be due to both
the peculiarities of granulometric composition of carbon black microparticles,
different size, and uneven spatial distribution of platinum nanoparticles
in the pores and on the surface of the carbon support. The correlation
between the length of a section in the thermograms and the fraction
of carbon microparticles poorly coated with platinum can be used to
analyze the uniformity of Pt nanoparticle spatial distribution in
the metal–carbon catalysts and therefore to select electrocatalysts
with optimal microstructure. This analysis is expected to be effectively
utilized in order to assess the uniformity of platinum distribution
on carbon microparticles and also to provide additional information
about granulometric composition of carbon supports