Cyclic voltammetric deposition of hydrous ruthenium oxide for electrochemical capacitors

Journal Article · Thu Jul 01 04:00:00 EDT 1999 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1391956· OSTI ID:680045

Hu, C C; Huang, Y H ^[1]

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1. National Chung Cheng Univ., Chia-Yi (Taiwan, Province of China). Dept. of Chemical Engineering

Hydrous ruthenium oxide-coated titanium electrodes (RuO{sub x}{center_dot}nH{sub 2}O/Ti) with high pseudocapacitance were prepared by cyclic voltammetry from an aqueous chloride solution in the {minus}200 to 1000 mV range. The growth rate of RuO{sub x}{center_dot}nH{sub 2}O, represented by i{sub p} (peak current) of the cyclic voltammograms, was constant up to cycle 120, but it decreased slightly between 120 and 240 cycles. Voltammetric responses studied by cyclic voltammetry as well as the charging and discharging behavior examined by chronopotentiometry in 0.5 M H{sub 2}SO{sub 4} demonstrated the suitability of RuO{sub x}{center_dot}H{sub 2}O for use in electrochemical capacitors. X-ray diffraction spectra exhibited an amorphous structure of this hydrous oxide film. The oxide consisted of mixed oxyruthenium species with various oxidation states as demonstrated by X-ray photoelectron spectroscopy, and the RuO{sub x}{center_dot}nH{sub 2}O surface showed a porous morphology.

• OSTI ID: 680045
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 7 Vol. 146; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
CAPACITIVE ENERGY STORAGE EQUIPMENT
ELECTRICAL PROPERTIES
FABRICATION
MICROSTRUCTURE
RUTHENIUM OXIDES
VALENCE