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Research Papers

# Analysis of Long-Term and Thermal Cycling Tests for a Commercial Solid Oxide Fuel Cell

[+] Author and Article Information
Dustin Lee

Nuclear Fuels and Materials Division,
Institute of Nuclear Energy Research,
Jiaan Village, Longtan District,
Taoyuan City 32546, Taiwan
e-mail: djlee@iner.gov.tw

Jing-Kai Lin

Nuclear Fuels and Materials Division,
Institute of Nuclear Energy Research,
Jiaan Village, Longtan District,
Taoyuan City 32546, Taiwan
e-mail: zxc782316@iner.gov.tw

Chun-Huang Tsai

Physics Division,
Institute of Nuclear Energy Research,
Jiaan Village, Longtan District,
Taoyuan City 32546, Taiwan
e-mail: tsaich@iner.gov.tw

Szu-Han Wu

Nuclear Fuels and Materials Division,
Institute of Nuclear Energy Research,
Jiaan Village, Longtan District,
Taoyuan City 32546, Taiwan
e-mail: shwu@iner.gov.tw

Yung-Neng Cheng

Nuclear Fuels and Materials Division,
Institute of Nuclear Energy Research,
Jiaan Village, Longtan District,
Taoyuan City 32546, Taiwan
e-mail: yncheng@iner.gov.tw

Ruey-Yi Lee

Nuclear Fuels and Materials Division,
Institute of Nuclear Energy Research,
Jiaan Village, Longtan District,
Taoyuan City 32546, Taiwan
e-mail: rylee@iner.gov.tw

1Corresponding author.

Manuscript received March 14, 2017; final manuscript received June 22, 2017; published online August 1, 2017. Assoc. Editor: Kevin Huang.

J. Electrochem. En. Conv. Stor. 14(4), 041002 (Aug 01, 2017) (8 pages) Paper No: JEECS-17-1031; doi: 10.1115/1.4037232 History: Received March 14, 2017; Revised June 22, 2017

## Abstract

The effects of isothermally long-term and thermal cycling tests on the performance of an ASC type commercial solid oxide fuel cell (SOFC) have been investigated. For the long-term test, the cells were tested over 5000 h in two stages, the first 3000 h and the followed 2000 h, under the different flow rates of hydrogen and air. Regarding the thermal cycling test, 60 cycles in total were also divided into two sections, the temperature ranges of 700 °C to 250 °C and 700 °C to 50 °C were applied for the every single cycle of first 30 cycles and the later 30 cycles, respectively. The results of long-term test show that the average degradation rates for the cell in the first 3000 h and the followed 2000 h under different flow rates of fuel and air are 1.16 and 2.64%/kh, respectively. However, there is only a degradation of 6.6% in voltage for the cell after 60 thermal cycling tests. In addition, it is found that many pores formed in the anode of the cell which caused by the agglomeration of Ni after long-term test. In contrast, the vertical cracks penetrating through the cathode of the cell and the in-plane cracks between the cathode and barrier layer of the cell formed due to the coefficient of thermal expansion (CTE) mismatch after 60 thermal cycling tests.

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## Figures

Fig. 1

The cell test rig

Fig. 2

Element mapping of the cell

Fig. 3

The result of the SOP long-term test

Fig. 4

The V–I–P curves at various times for the SOP long-term test

Fig. 5

Impedance spectra results at OCV

Fig. 6

The result of the long-term test for reducing flow rate

Fig. 7

The comparison of V–I–P curve for the two long-term tests with various flow rates

Fig. 8

The comparison of V–I–P curve before and after the recovering process

Fig. 9

Impedance spectra results at OCV condition before and after the recovering process

Fig. 10

Thermal cycling results at different temperature ranges

Fig. 11

The cross section of the commercial cell after the reduction process: (a) cross section of the cell and (b) the enlarged cathode

Fig. 12

The cross section of the tested cell after the 5000 h long-term test and the recovery process

Fig. 13

The cross section of the tested cell after the 60 thermal cycles

Fig. 14

The enlarged cathode of the tested cell after the 5000 h long-term test and the recovery process

Fig. 15

The enlarged cathode of the tested cell after the 60 thermal cycles

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