Electrochemical oxidation in a CH{sub 4}-H{sub 2}O system at the interface of a Pt electrode and Y{sub 2}O{sub 3}-stabilized ZrO{sub 2} electrolyte. 2: The rates of electrochemical reactions taking place in parallel
- Tohoku Univ., Sendai (Japan). Research Inst. for Scientific Measurements
- Chiba Univ. (Japan). Faculty of Education
- Yokohama National Univ. (Japan). Inst. of Environmental Science and Technology
The rate processes of electrochemical reactions were clarified in a CH{sub 4}-H{sub 2}O system at the interface of a porous Pt electrode/Y{sub 2}O{sub 3}-stabilized ZrO{sub 2} electrolyte. Direct-current polarization measurements and ac impedance spectroscopy were made with gas analysis before and after the reaction at 1,073 K. The authors proposed an analytical method to determine the rates of electrochemical reactions taking place in parallel. When the ratio p(H{sub 2}O)/p(CH{sub 4}) of the inlet gas was close to zero, the observed relationship between the polarization current and electrode potential was interpreted by the electrochemical oxidation processes of H{sub 2}, CO, C, and CH{sub 4} in parallel using the proposed method. For example, the ratio of the oxidation rates for C/CO/CH{sub 4}/H{sub 2} is 1/1.3 x 10/1.9 x 10{sup 2}/2.8 x 10{sup 3} at E = {minus}600 mV vs. air. The result was obtained under very low CH{sub 4} concentration. The estimated oxidation rates of H{sub 2} and CO as functions of the electrode potential were described by the model proposed by Mizusaki et al. for the reaction of H{sub 2}-H{sub 2}O and CO-CO{sub 2}.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 659118
- Journal Information:
- Journal of the Electrochemical Society, Vol. 145, Issue 9; Other Information: PBD: Sep 1998
- Country of Publication:
- United States
- Language:
- English
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