The cathodic reduction of molecular oxygen was studled on bright platmum under voltammetnc contitlons m 1 N HCIO, Periodic current-potential curves were measured at 30 mV/s, and the ohnuc and capacitive components of the impedance platmum/solutlon were determmed under the same con&tlon at 1000 c/s m
Formation and reduction of the oxygen layer on cold-worked platinum-gold alloys in acid solutions
β Scribed by M.W. Breiter
- Publisher
- Elsevier Science
- Year
- 1965
- Tongue
- English
- Weight
- 367 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0013-4686
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β¦ Synopsis
Periodic potentiostatic current/potential curves have been measured at 30Β°C on platinumgold alloys with gold contents from 5 to 70 at. % in N HsS04 and N HCIOp at 30 and 300 mV/s. The curves exhibit a characteristic shape with two reduction waves during the cathodic sweep, To a first approximation the current/potential curves can be considered to be composed additively of the respective curves of the pure metals under consideration of the gold content. R&sum&---Courbes courant-~~ntiel potenti~~tiqu~ p&iodiques d'alliages Pt-Au (5 a 70 at%) dans H,S04.N et HClO,.N a 3O"C, pour 30 et 300 mV.s-I. Leur forme eat caract&isBe par deux vagues de reduction en fonctionnement cathodique. En premiere approximation, compte-tenu de la teneur en Au, ees eourhes peuvent etre consid&es eomme composees additivement de eelles res~iv~ment propres 51 ehaeun des metaux ~onstituants. Zusanunenfassung-Periodische Stromspammngskurven warden potentiostatiseh hei 30Β°C an Platin-Gold-Legierungen mit Goldgehalten von 5 bis 70 Atomprozent in N H&SO4 nnd N HCI04 bei 30 und 300 mV/s gemessen. Die Kurven weisen einen ch~akteristi~hen Verlauf mit zwei Reduktionsst~en w&rend des kathodischen Durchganges auf. Die Stromspannungskurven kiinnen in erster Annlherung als additiv aus den Kurven der reinen Metalle unter Berticksichtigung des Goldgehaltes zusammengesetzt betrachtet werden.
π SIMILAR VOLUMES
A&act -Kinetic parameters were determined for the oxygen evolution reaction on 50-50 atom percent alloys of Ru-Ir, Ru-Pt, and Ir-Pt and compared with results obtained using ruthenium, iridium, platinum, and RuO,,TiO, electrodes. The potentiostatic studies were made on oxide covered electrodes at 80Β°
Electrochemical reduction of oxygen on small platinum particles supported on carbon in 105 wt "/, phosphoric acid at 190Β°C was investigated by means ofa half-cell apparatus. Effects of platinum content in the catalyst layer and operating temperature of the electrode on this reaction were examined. T
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