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Research Papers

Study on the Influence of Current Collector on the Sudden Deterioration of Solid Oxide Fuel Cell Anode Performance

[+] Author and Article Information
Naoki Shikazono

e-mail: shika@iis.u-tokyo.ac.jp

Institute of Industrial Science,
University of Tokyo,
CREST-JST,
4-6-1 Komaba, Meguro-ku,
Tokyo 153-8505, Japan

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received August 21, 2013; final manuscript received November 19, 2013; published online December 5, 2013. Assoc. Editor: Dr Masashi Mori.

J. Fuel Cell Sci. Technol 11(2), 021010 (Dec 05, 2013) (8 pages) Paper No: FC-13-1074; doi: 10.1115/1.4026087 History: Received August 21, 2013; Revised November 19, 2013

The influence of current collector on the sudden deterioration phenomena of conventional nickel-yttria-stabilized zirconia composite solid oxide fuel cell (SOFC) anodes operated in hydrogen with high humidity concentration is investigated. Current collectors of different materials have been tested within different conditions. It is found that the loss of contact between current collector mesh and the top surface of an anode cause the sudden deterioration of the anode. Platinum and gold current collector meshes have been proven to lead to the sudden deterioration of an anode in short time operation in high humidity conditions in conventional SOFC operation temperatures.

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References

Figures

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Fig. 1

Experimental setup illustration for cell measurement

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Fig. 2

A-R terminal voltage against time measured in different humidities and temperatures by galvanostatic method. (Operation current density: 200 mAcm-2.)

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Fig. 3

A-R impedance spectrum evolutions versus time corresponding to Figs. 2(a)2(c)

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Fig. 4

C-R impedance spectrum evolution versus time corresponding to Fig. 2(a)

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Fig. 5

A-R terminal voltage against time measured with different anode thicknesses by galvanostatic method. (Operation current density: 200 mAcm-2, within 30%H2O hydrogen at 800 °C.)

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Fig. 6

A-R terminal voltage against time measured with anodes sintered at different temperatures by galvanostatic method. (Operation current density: 200 mAcm-2, within 30%H2O hydrogen at 800 °C.)

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Fig. 7

A-R terminal voltage against time measured with current collector made by (a) Au and (b) Ni meshes, by galvanostatic method. (Operation current density: 200 mAcm-2, within 30%H2O hydrogen at 800 °C.)

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Fig. 8

SEM images of the anode with porous Ni top. (Red line indicates the boundary between anode and Ni top.)

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Fig. 9

A-R terminal voltage against time measured at (a) 800 °C and (b) at 1000 °C with porous Ni top by galvanostatic method. (Operation current density: 200 mAcm-2, within 30%H2O hydrogen.)

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Fig. 10

(a) A-R impedance spectrum evolutions versus time corresponding to Fig. 9(a) and 9(b) A-R impedance spectrum evolutions versus time corresponding to Fig. 7(b)

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Fig. 11

Experimental setup illustration for cell measurement with point current collector

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Fig. 12

A-R terminal voltage versus time measured in different temperatures with point current made by (a) Pt, (b) Au, and (c) Ni, by galvanostatic method. (Operation current density: 200 mAcm-2, within 30%H2O hydrogen at 800 °C.)

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Fig. 13

A-R terminal voltage and temperature profile versus time. (Operation current density: 200 mAcm-2, within 30%H2O hydrogen.)

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Fig. 14

Illustration of anode sudden deterioration caused by the coarsening of Ni and the recovering caused by the temperature rising

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Fig. 15

A-R impedance spectrum evolution versus time under OCV tested in 30%H2O hydrogen at 800 °C

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