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First China-Japan Workshop on Solid Oxide Fuel Cells

Ce0.8M0.2O2δ(M=Mn,Fe,Ni,Cu) as SOFC Anodes for Electrochemical Oxidation of Hydrogen and Methane

[+] Author and Article Information
Hengyong Tu1

Institute of Fuel Cell, Department of Automation, School of Electronic Information and Electrical Engineering,  Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, P.R.C.hytu@sjtu.edu.cn

Hong Lv

Clean Energy Automotive Engineering Center,  Tongji University, 4800 Cao’an Road, Shanghai 201804, P.R.C.

Qingchun Yu, Xinjian Zhu

Institute of Fuel Cell, Department of Automation, School of Electronic Information and Electrical Engineering,  Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, P.R.C.

Keao Hu

State Key Laboratory of Metal Matrix Composites,  Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, P.R.C.

1

Corresponding author.

J. Fuel Cell Sci. Technol 5(3), 031203 (May 23, 2008) (4 pages) doi:10.1115/1.2927764 History: Received July 27, 2007; Revised December 06, 2007; Published May 23, 2008

Oxide anodes such as doped ceria offer improved tolerance for nonidealities in anode environment such as redox cycles, sulfur and other poisons, and hydrocarbons. Mixed-valence transition element in ceria provides an additional redox couple besides Ce4+Ce3+ in reduced atmosphere, facilitating its electrocatalytic reaction for oxidation of fuels. This paper presents the electrochemical characteristics of Ce0.8M0.2O2δ(M=Mn,Fe,Ni,Cu) for oxidation of hydrogen and methane. Ce0.8M0.2O2δ was synthesized, and crystal phase analysis by X-ray diffraction was performed. Single-phase Ce0.8M0.2O2δ(M=Mn,Fe,Ni) were formed. A second phase, CuO, was found in the powders with the nominal composition of Ce0.8Cu0.2O2δ. Ce0.8M0.2O2δ exhibited stability in reducing atmosphere. In comparison, similar microstructural characteristics were found for Ce0.8M0.2O2δ(M=Mn,Fe,Cu). However, Ce0.8Ni0.2O2δ exhibits poor microstructure with large cracks. The electrochemical oxidation of wet hydrogen and wet methane was investigated with impedance spectroscopy by using the three-electrode configuration. It was found that Ce0.8M0.2O2δ(M=Mn,Fe,Ni,Cu) demonstrates relatively low electrochemical activity in both hydrogen and methane. Regarding low n-type conductivity of transition metal cation-containing ceria, it was suggested that an oxide with a high electronic conductivity be added into the Ce0.8M0.2O2δ matrix for improvement of the electrode performance.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

XRD patterns of Ce0.8M0.2O2−δ(M=Mn,Fe,Ni,Cu)

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Figure 2

XRD patterns of Ce0.8M0.2O2−δ(M=Mn,Fe,Ni,Cu) after reduction in H2 for 24h

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Figure 3

Cross-sectional view of Ce0.8M0.2O2−δ(M=Mn,Fe,Ni,Cu)∕CGO interfaces

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Figure 8

Polarization curves of Ce0.8M0.2O2−δ(M=Mn,Cu) in wet CH4 at 650°C

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Figure 7

Polarization curves of Ce0.8M0.2O2−δ(M=Mn,Fe,Ni,Cu) in wet H2 at 650°C

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Figure 6

Impedance spectra for Ce0.8M0.2O2−δ(M=Mn,Cu) in wet CH4 at 650°C

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Figure 5

Impedance spectra for Ce0.8M0.2O2−δ(M=Mn,Fe,Ni,Cu) in wet H2 at 650°C

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Figure 4

Surfaces of Ce0.8M0.2O2−δ(M=Mn,Fe,Ni,Cu)

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