The electrochemistry of iridium oxide films in some nonaqueous solvents

Journal Article · Fri Jan 01 04:00:00 EST 1988 · J. Electrochem. Soc.; (United States)

DOI:https://doi.org/10.1149/1.2095585· OSTI ID:6952397

Pickup, P G; Birss, V I

Ir oxide films, grown in aqueous LIClO/sub 4/ solutions (rhoH -- 9), have been found to exhibit excellent charge capacities, charging and discharging kinetics, and stability in acetonitrile and propylene carbonate with LiClO/sub 4/ as the supporting electrolyte, while the results in THF also appear to be quite promising. The oxide is electrochromic in all of these media. In order to obtain the optimum response of Ir oxide in nonaqueous solutions, it is important to prevent the drying out of the oxide when transferring it from the aqueous to nonaqueous media. Discharging and charging of the oxide appears to involve Li/sup +/ insertion and expulsion from the oxide, respectively. Oxides formed in neutral aqueous LiClO/sub 4/ solutions have been found to be mechanically more stable than those grown in aqueous 0.5M H/sub 2/SO/sub 4/ or in 50% aqueous acetonitrile/LiClO/sub 4/. This is supported by SEM evidence of a less cracked and more adherent Ir oxide film when grown in neutral aqueous LiClO/sub 4/ solutions, as compared to the case in the latter solutions.

• Research Organization: Dept. of Chemistry, Memorial Univ. of Newfoundland, St. John's, Newfoundland (CA)
• OSTI ID: 6952397
• Journal Information: J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 135:1; ISSN JESOA
• Country of Publication: United States
• Language: English

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ACETONITRILE
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CARBONIC ACID ESTERS
CHALCOGENIDES
CHEMICAL PROPERTIES
CHEMICAL REACTION KINETICS
CHEMISTRY
CHLORATES
CHLORINE COMPOUNDS
CRYSTAL GROWTH
DISPERSIONS
ELECTRIC BATTERIES
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
ELECTRODES
ELECTROLYTES
ELECTRON MICROSCOPY
ESTERS
FURANS
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IRIDIUM COMPOUNDS
IRIDIUM OXIDES
KINETICS
LITHIUM COMPOUNDS
MICROSCOPY
MIXTURES
NITRILES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
SCANNING ELECTRON MICROSCOPY
SOLUTIONS
SULFURIC ACID
TETRAHYDROFURAN
TRANSITION ELEMENT COMPOUNDS