A study of gas evolution in teflon bonded porous electrodes—I: The mechanical and chemical stability of teflon bonded graphite electrodes

✍ Scribed by P.R. Vassie; A.C.C. Tseung

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 268 KB
• Volume: 20
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(75)85011-0

✦ Synopsis

The mechanical and chemical stabxlity of Teflon * bonded graphite electrodes operating in the oxygen evolution mode in 5N KOH was studied as a function of cd and time. The electrode starts to break up at 13 mA cm-' and on subsequent cathodic oxygen reduction performance is greatly reduced. Moreover, significant decrease in cathodic performance also occurs when the electrode has been operated at anodic currents of only 1 mAcm -'. It is concluded that the deterioration is not due to oxidation of graphite to CO, or CO but to the mechanical disintegration of the ebctrocatalyst structure as well as the formation of solid graphite oxides.

INTKODUCIION

Electrolytic

gas evolution reactions are widely used