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

Onuma, Shigenori; Kaimai, Atsushi; Kawamura, Kenichi; Nigara, Yutaka; Kawada, Tatsuya; Mizusaki, Junichiro; Inaba, Hideaki; Tagawa, Hiroaki

doi:10.1149/1.1838773

Title: 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

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Abstract

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}.

Authors:

Onuma, Shigenori; Kaimai, Atsushi; Kawamura, Kenichi; Nigara, Yutaka; Kawada, Tatsuya; Mizusaki, Junichiro ^[1]; Inaba, Hideaki ^[2]; Tagawa, Hiroaki ^[3]

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

Publication Date:: Tue Sep 01 00:00:00 EDT 1998

Sponsoring Org.:: USDOE

OSTI Identifier:: 659118

Resource Type:: Journal Article

Journal Name:: Journal of the Electrochemical Society

Additional Journal Information:: Journal Volume: 145; Journal Issue: 9; Other Information: PBD: Sep 1998

Country of Publication:: United States

Language:: English

Subject:: 30 DIRECT ENERGY CONVERSION; NATURAL GAS FUEL CELLS; SOLID ELECTROLYTE FUEL CELLS; ELECTROCHEMISTRY; METHANE; OXIDATION; CHEMICAL REACTION KINETICS; PARTIAL PRESSURE; WATER VAPOR

Citation Formats


                    Onuma, Shigenori, Kaimai, Atsushi, Kawamura, Kenichi, Nigara, Yutaka, Kawada, Tatsuya, Mizusaki, Junichiro, Inaba, Hideaki, and Tagawa, Hiroaki. 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.  United States: N. p., 1998. 
        Web.  doi:10.1149/1.1838773.

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                    Onuma, Shigenori, Kaimai, Atsushi, Kawamura, Kenichi, Nigara, Yutaka, Kawada, Tatsuya, Mizusaki, Junichiro, Inaba, Hideaki, & Tagawa, Hiroaki. 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.  United States.  https://doi.org/10.1149/1.1838773

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                    Onuma, Shigenori, Kaimai, Atsushi, Kawamura, Kenichi, Nigara, Yutaka, Kawada, Tatsuya, Mizusaki, Junichiro, Inaba, Hideaki, and Tagawa, Hiroaki. 1998.  
        "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".  United States.  https://doi.org/10.1149/1.1838773.

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@article{osti_659118,

  title        = {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},

  author       = {Onuma, Shigenori and Kaimai, Atsushi and Kawamura, Kenichi and Nigara, Yutaka and Kawada, Tatsuya and Mizusaki, Junichiro and Inaba, Hideaki and Tagawa, Hiroaki},

  abstractNote = {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}.},

  doi          = {10.1149/1.1838773},

  url          = {https://www.osti.gov/biblio/659118},
  journal      = {Journal of the Electrochemical Society},
number       = 9,

  volume       = 145,

  place        = {United States},

  year         = {Tue Sep 01 00:00:00 EDT 1998},

  month        = {Tue Sep 01 00:00:00 EDT 1998}

}

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