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Study of the adsorption of p-nitrophenol on platinized platinum electrodes

✍ Scribed by G. Horányi; G. Vértes

Publisher
Elsevier Science
Year
1973
Weight
311 KB
Volume
43
Category
Article
ISSN
0022-0728

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✦ Synopsis

In a preliminary note 1 the study of the adsorption of p-nitrophenol from 1.0 M HC10 4 solution on platinized platinum electrodes by tracer methods was reported.

The main results may be summarized as follows (i) Between 300-800 mV (RHE) practically no change of adsorption occurs on varying the electrode potential.

(ii) At these potentials and concentrations above 10 -4 mol 1-1 the extent of adsorption is not affected by concentration.

(iii) The desorption rate of adsorbed species is very low.

From these statements the conclusion was drawn that the adsorption properties of p-nitrophenol cannot be treated by adsorption equilibrium theories.

It is well known from earlier work 2' 3 that the hydrogenation and electrochemical hydrogenation of p-nitrophenol occurs at a significant rate on platinum electrodes in both acidic and alkaline media at potentials more negative than 300-400 inV. The assumed mechanism of hydrogenation is an ionic one i.e. the process

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✍ G. Horányi 📂 Article 📅 1974 🏛 Elsevier Science ⚖ 717 KB

The study of the adsorption of different organic compounds on solid electrodes has been the subject of much work' during the last 10-15 years. A good survey is given in refs. 1 and 2 of literature up to 1968. Table 1 lists systems that have been studied in the last years 3-~2s. The Table is composed