The effect of the particle size of ultrafine palladium particles supported on a flat and dense glassy carbon on the electrochemical oxidation of formaldehyde in a perchloric acid solution has been investigated by cyclic voltammetry (CV) and differential electrochemical mass spectroscopy (DEMS). A ma
Electrocatalytic oxidation of formic acid on ultrafine palladium particles supported on a glassy carbon
โ Scribed by Xiao-Gang Zhang; Toshihide Arikawa; Yasushi Murakami; Kiyochika Yahikozawa; Yoshio Takasu
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 710 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0013-4686
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โฆ Synopsis
The effect of particle size of ultrafine palladium particles on the electrochemical oxidation of formic acid in a perchloric acid solution has been investigated by cyclic voltammetry (CV) and differential electrochemical mass spectroscopy (DEMS). Except in the hydrogen sorption&sorption region, only carbon dioxide was observed by the DEMS as an oxidation product, and the profile of the i,,,-E curve was in fair agreement with that of i-E curves. With a decrease in the palladium particle size, the specific activity of the palladium particles for the oxidation of formic acid gradually increased until cc. 3 nm in the mean diameter, and then it steeply decreased.
๐ SIMILAR VOLUMES
Ultrafine Au particles were supported on flat glassy carbon substrates with fine dispersion, by means of the vacuum evaporation technique. Highest activities toward the HCHO oxidation in alkaline media were obtained with the electrodes of intermediate amounts of Au deposited.
The oxidation of formic acid at the Pd/C catalyst electrode is a completely irreversible kinetic process with the reaction order of 1.0. The oxidation rate of formic acid is increased with increasing the concentration of formic acid and is decreased with increasing H + concentration. The apparent ne