The oxygen evolution reaction on cycled iridium electrodes

Oxygen evolution activity and stability of iridium in acidic media. Part 2. – Electrochemically grown hydrous iridium oxide

“…This can be due to: (a) variation of oxide activity with thickness; (b) mass transfer (water to all active sites or oxygen molecules and protons from 3-D oxide matrix) hindrances; (c) change in local pH due to high amount of produced protons trapped within the 3-D oxide matrix; (d) combinations of any from a-c, etc. Similar dependence was found by Frazer and Woods on cycled iridium electrodes [54]. In their potentiostatic experiments OER current scaled almost linear with oxide charge.…”

Electrical stimulation of excitable tissue: design of efficacious and safe protocols

“…Cathodic processes, defined as those where reduction of species in the electrolyte occur as electrons are transferred from the electrode to the electrolyte, include such reactions as: Ag + + e − ↔ Ag (reduction of silver ions) ( 1.8a) AgCl ↔ Ag + + Cl − (dissolution of silver chloride) ( 1.8b) Anodic processes, defined as those where oxidation of species in the electrolyte occur as electrons are transferred to the electrode, include: 1.7) is the general form of reversible valency changes that occur in a multilayer oxide film of iridium, ruthenium or rhodium, with associated proton or hydroxyl ion transfer (Rand and Woods, 1974;Frazer and Woods, 1979;Gottesfeld, 1980;DautremontSmith, 1982). Reactions (1.8a) and (1.8b) are the reversible reactions of a silver chloride electrode driven cathodically.…”

High‐Performance Supported Iridium Oxohydroxide Water Oxidation Electrocatalysts

“…[11] Am ethod of choice for ATOs ynthesis is hydrothermals ynthesis because of the smallresulting particlesizes. [30][31][32][33][34][35] For example, Reier et al showedt hat Ir acetate calcined at 250 8Cy ieldeda morphous Ir oxide/hydroxides pecies combining both activity and relative stabilityi na cidic OER. For instance,T seung and Dhara studied Pt supported on ATOv ersus carbon black under harsh conditions in H 3 PO 4 at 150 8C.…”