The electrocatalytic oxidation of methanol in acid electrolyte: preparation and characterization of noble metal electrocatalysts supported on pre-treated carbon-fibre papers

Particle size effect of carbon-supported platinum catalysts for the electrooxidation of methanol

“…The results presented here differ from those of Attwood et al [11], who observed a maximum in specific activity vs. platinum area. Estimation of the particle size from the specific surface area reveals that the sizes used by Attwood et al are in the same range (1.5-4 nm) as those considered here.…”

“…Watanabe et al [14] prepared Pt catalysts with different particles sizes on several carbon supports, using the same preparation method. The surface area of these catalysts ranged from 70 to 201 m e g-l, thus convering approximately the same range as those of Attwood et al [11]. Surprisingly, however, they did not find a particle size effect; the specific activity for the methanol oxidation appeared to be the same for all Pt particle sizes.…”

“…For the range of particle sizes where 0oH does not become too high, one would therefore expect a positive effect on the activity of methanol oxidation. Such an effect has indeed been reported: Attwood et al [11], employing Pt/C catalysts prepared in a variety of ways, found an optimum in the specific activity at a specific surface area of 140 m 2 g-l, corresponding to a Pt particle size of about 3 nm. However, different preparation methods and different carbon supports were used, so the metal-support interaction could also have been changed.…”

Size Effects in Electrocatalysis of Fuel Cell Reactions on Supported Metal Nanoparticles

“…They found a bell-shaped curve for the dependence of SA on particle size, with the maximum at about 2 nm [Attwood et al, 1980]. Takasu and co-workers reported a decrease in SA with decreasing particle size for Pt particles deposited on GC by vacuum deposition, as depicted in Fig.…”

On-line characterization of platinum/graphite catalysts during liquid phase oxidations using cyclic voltammetry

“…As a function of the catalyst potential an electric current is measured. Cyclic voltammetry has been mainly used for the characterization of fuel cell electrodes, consisting of carbon supported platinum catalysts [23][24][25][26][27], to study the influence of the preparation method on the electrocatalytic performance. It has also been applied as an ex-situ technique for the characterization of graphite supported catalysts before and after the oxidation of alcohols and carbohydrates [11,28].…”