Study of the Ag/HAP/Pt system in an oxygen-containing atmosphere

✍ Scribed by G.Ya. Kolbasov; T.A. Karasyova; V.G. Oreshnikov; M.N. Klyuchnikov; T.S. Psaryova

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 307 KB
• Volume: 100
• Category: Article
• ISSN: 0167-2738
• DOI: 10.1016/s0167-2738(97)00204-x

✦ Synopsis

Charge transfer processes have been studied in the Ag/HAP/Pt system in an oxygen atmosphere. It has been found for the Ag/HAP/Pt contact that at negative potentials on Ag, molecular oxygen reduction currents are observed, which are limited by 0, diffusion to silver. Anode reaction on silver is a formation reaction of AgC ions which accumulate near the interface by ion-exchange. At negative potentials on Pt, molecular oxygen reduction currents were also observed; at positive potentials on Pt, there was an oxygen evolution due to crystal water decomposition. The U voltage value generated in the Ag/HAP/Pt system at an 0, pressure of 1 atm and 18°C was 0.48 V. Increase in U values with rising temperature is attributed to the temperature dependence of the overpotential of oxygen reduction on Pt.