Oxygen overvoltage on SnO2-based anodes in NafAlF3Al2O3 melts. Electrocatalytic effects of doping agents

✍ Scribed by Y.X. Liu; J. Thonstad

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 395 KB
• Volume: 28
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(83)85093-2

✦ Synopsis

Abstractaxygen overvoltage on sintered anodes made of SnO, +2 wt % SbzOs + 2 wt% CuO was measured in 2.7 NaF-AIF,-Al,O,(sat) melts at 1000 "C. Prior to use the sintered elwtrodes were dipped into solutions containing doping agents. Doping with Ru, Fe and Cr showed a marked electrocatalytic efTect. Ru was the most effective, and compared with undoped material the coefficients for the initial Tafel line decreased from a = 0.11 to 0.070 V and from b = 0.065 to 0.035 V dec-I. Steeper slopes appeared at high cds, being 0.14VdeY' for Ru. but the overvoltage was as low as 0.15V even at 4Acm-*.