Electrocatalysis of anodic oxygen evolution at the nickel hydroxide electrode by ferric hydroxo species in alkaline electrolytes
✍ Scribed by Alexander A. Kamnev; Boris B. Ezhov
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 813 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
On the basis of the proposed anodzc oxygen evolutzon (AOE) reactzon model at the nickel hydroxzde electrode (nhe) m the presence of an electrocatalytzcally actzve addztzve m the eiectrolyte, eg femc hydroxo complexes (FHC), the role of FHC adsorption zn the AOE electrocatalyszs has been revealed uang the data from stahonary polarrzatlon measurements Klnettc parameters of the AOE reactIon have also been calculated nhe surface coverage by fernc hydroxo spec~e-s adsorbed from the electrolyte was shown to etiblt behamour sumlar to the Henry adsorption Isotherm type reachmg, nevertheless, w&ant values (up to the complete coverage m the hnutmg case) Its independence from electrode potentml (at gven concentrations of femc hydroxo complexes m the electrolyte) throughout the AOE potential regon studied (0 50-O 65 V vs Hg/HgO/8 M KOH) has beezz noted In sztu Mossbauer spectroscopic mvestzgatzon m the transmzsaon mode on the nhe containing the femc hydroxide addztzve on its surface dzd not reveal any hzghly oxrdzzed zron states durmg anodzc polamatzon m the AOE potential regzon This does not exclude the posszbzlzty of the exzstence m znmor quantztzes and/or m a scarcely detectable form a highly oxzdzzed zron state (eg m the form of mobile unstable intermediates gzvmg no or neghgzbly small Mossbauer effect)