Rotating ring-disk electrode and spectroelectrochemical studies on the oxidation of iron in alkaline solutions

Journal Article · Tue Mar 01 04:00:00 EST 1994 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2054798· OSTI ID:7109895

Zhang, H; Park, S ^[1]

---

1. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemistry

The investigation of the anodic oxidation of iron in alkaline solutions is important because it is used as a cathodic reaction in Fe/Ni and Fe/air batteries, and it is also related to the corrosion of iron. The electrochemical oxidation of iron has been studied in concentrated alkaline solutions employing rotating ring-disk electrode voltammetric and in situ spectroelectrochemical techniques. While four anodic and cathodic cyclic voltammetric (CV) peaks may be observed at times, three cathodic CV peaks and four anodic peaks are observed under the usual experimental conditions. Results obtained from these studies are consistent with the conclusion that iron is oxidized to Fe(2) at the least positive anodic CV peak, Fe[sub 3]O[sub 4] at the second peak, [delta]-FeOOH and Fe[sub 2]O[sub 3] at the third peak, and Fe[sub 3]O[sub 4] below the [delta]-FeOOH layer at the most positive anodic peak. Corresponding cathodic CV peaks were identified for all these anodic processes, except for the most positive one. Evidence supporting the conclusion and detailed mechanisms for the iron oxidation is presented.

• OSTI ID: 7109895
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 141:3; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
ANODES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
ELECTRODES
ELEMENTS
IRON
IRON COMPOUNDS
IRON OXIDES
IRON-AIR BATTERIES
IRON-NICKEL BATTERIES
KINETICS
METAL-GAS BATTERIES
METAL-METAL OXIDE BATTERIES
METALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VOLTAMETRY