Synthesis and characterization of Ru-Ti[sub 4]O[sub 7] microelectrode arrays
- Iowa State Univ., Ames, IA (United States). Dept. of Chemistry and Ames Lab.
A synthesis is described for Ru microelectrode arrays within a conductive Ti[sub 4]O[sub 7] ceramic matrix. Data obtained by X-ray diffractometry and scanning electron microscopy are consistent with the existence of heterogeneous mixtures of Ru particles (ca. 0.8 [mu]m diam) within the Ti[sub 4]O[sub 7] matrices. No mixed metal oxides or other new compounds are detected. Rotated disk electrodes (RDEs) constructed from the Ru-Ti[sub 4]O[sub 7] materials are compared on the basis of their voltammetric response for the oxidations of I[sup [minus]] to I[sub 2] and IO[sup [minus]][sub 3] in 0.1M H[sub 2]SO[sub 4]. These results are rationalized on the basis of microelectrode arrays, i.e., elevated current densities and diminished sensitivity to changes in rotational velocity compared with solid Ru RDE. An RDE constructed from Ru-Ti[sub 4]O[sub 7] containing ca. 0.5% Ru by volume exhibits virtually zero dependence on rotational velocity for the oxidation of I[sup [minus]] to I[sub 2] and, therefore, this material functions as an ideal microelectrode array.
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 7108018
- Journal Information:
- Journal of the Electrochemical Society; (United States), Vol. 141:4; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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25 ENERGY STORAGE
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