Coke-free operation of an all porous solid oxide fuel cell (AP-SOFC) used as an O2 supply device

Degradation of electrode microstructure is one of the key factors affecting long term performance of Solid Oxide Fuel Cell systems. Evolution of a multiphase system can be described quantitatively by the change in its interfacial energy. In this paper, we discuss free energy of a microstructure to showcase the anisotropy of its evolution during a long-term performance experiment involving an SOFC stack. Ginzburg Landau type functional is used to compute the free energy, using diffuse phase distributions based on Focused Ion Beam Scanning Electron Microscopy images of samples taken from nine different sites within the stack. It is shown that the rate of microstructure evolution differs depending on the position within the stack, similar to phase anisotropy. However, the computed spatial relation does not correlate with the observed distribution of temperature.

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Integrated Cr and S poisoning of a La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) cathode for solid oxide fuel cells

RSC Advances ◽

10.1039/d0ra09239h ◽

2021 ◽

Vol 11 (1) ◽

pp. 7-14

Author(s):

Cheng Cheng Wang ◽

Mortaza Gholizadeh ◽

Bingxue Hou ◽

Xincan Fan

Keyword(s):

Fuel Cells ◽

Fuel Cell ◽

Solid Oxide Fuel Cells ◽

Solid Oxide Fuel Cell ◽

Solid Oxide ◽

Cell Performance ◽

Oxide Fuel ◽

Performance Deterioration

Strontium segregation in a La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) electrode reacts with Cr and S in a solid oxide fuel cell (SOFC), which can cause cell performance deterioration.

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An all porous solid oxide fuel cell (SOFC): a bridging technology between dual and single chamber SOFCs

Energy & Environmental Science ◽

10.1039/c3ee40131f ◽

2013 ◽

Vol 6 (7) ◽

pp. 2119 ◽

Cited By ~ 31

Author(s):

Youmin Guo ◽

Mehdi Bessaa ◽

Sonia Aguado ◽

Marlu Cesar Steil ◽

Damien Rembelski ◽

...

Keyword(s):

Fuel Cell ◽

Solid Oxide Fuel Cell ◽

Solid Oxide ◽

Porous Solid ◽

Oxide Fuel ◽

Single Chamber

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

Journal of Electrochemical Energy Conversion and Storage ◽

10.1115/1.4037232 ◽

2017 ◽

Vol 14 (4) ◽

Cited By ~ 3

Author(s):

Dustin Lee ◽

Jing-Kai Lin ◽

Chun-Huang Tsai ◽

Szu-Han Wu ◽

Yung-Neng Cheng ◽

...

Keyword(s):

Fuel Cell ◽

Thermal Cycling ◽

Solid Oxide Fuel Cell ◽

Coefficient Of Thermal Expansion ◽

Solid Oxide ◽

Oxide Fuel ◽

Flow Rates ◽

Degradation Rates ◽

Two Stages

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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