A novel U-shaped anode-supported hollow fiber solid oxide fuel cell with considerable thermal cycling performance and stability

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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Novel asymmetric anode-supported hollow fiber solid oxide fuel cell

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2012.01.120 ◽

2012 ◽

Vol 523 ◽

pp. 134-138 ◽

Cited By ~ 6

Author(s):

Dixiong Zhou ◽

Shujun Peng ◽

Yanying Wei ◽

Zhong Li ◽

Haihui Wang

Keyword(s):

Fuel Cell ◽

Solid Oxide Fuel Cell ◽

Hollow Fiber ◽

Solid Oxide ◽

Oxide Fuel

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A Simulation of the Solid Oxide Fuel Cell Electrochemical Light Off Phenomenon

Heat Transfer: Volume 4 ◽

10.1115/ht2005-72845 ◽

2005 ◽

Author(s):

Comas L. Haynes ◽

J. Chris Ford

Keyword(s):

Fuel Cell ◽

Thermal Cycling ◽

Solid Oxide Fuel Cell ◽

Heat Generation ◽

Operating Conditions ◽

Solid Oxide ◽

Oxide Fuel ◽

Cell Potential ◽

Start Up ◽

Electrochemical Transport

During latter-stage, “start-up” heating of a solid oxide fuel cell (SOFC) stack to a desired operating temperature, heat may be generated in an accelerating manner during the establishment of electrochemical reactions. This is because a temperature rise in the stack causes an acceleration of electrochemical transport given the typical Arrhenius nature of the electrolyte conductivity. Considering a potentiostatic condition (i.e., prescribed cell potential), symbiosis thus occurs because greater current prevalently leads to greater by-product heat generation, and vice versa. This interplay of the increasing heat generation and electrochemistry is termed “light off”, and an initial model has been developed to characterize this important thermal cycling phenomenon. The results of the simulation begin elucidating the prospect of using cell potential as well as other electrochemical operating conditions (e.g., reactants utilization) as dynamic controls in managing light off transients and possibly mitigating thermal cycling issues.

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An anode-supported hollow fiber solid oxide fuel cell with (Pr0.5Nd0.5)0.7Sr0.3MnO3−δ–YSZ composite cathode

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2010.03.084 ◽

2010 ◽

Vol 497 (1-2) ◽

pp. 386-389 ◽

Cited By ~ 7

Author(s):

Xiaozhen Zhang ◽

Bin Lin ◽

Yihan Ling ◽

Yingchao Dong ◽

Guangyao Meng ◽

...

Keyword(s):

Fuel Cell ◽

Solid Oxide Fuel Cell ◽

Hollow Fiber ◽

Composite Cathode ◽

Solid Oxide ◽

Oxide Fuel

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Stability study of triple layer hollow fiber in solid oxide fuel cell with methane as fuel

Ionics ◽

10.1007/s11581-020-03506-8 ◽

2020 ◽

Vol 26 (6) ◽

pp. 3073-3083

Author(s):

Mohd Hilmi Mohamed ◽

Mohd Hafiz Dzarfan Othman ◽

Mohd Zamri Mohd Yusop ◽

Siti Khadijah Hubadillah ◽

Yuji Iwamoto ◽

...

Keyword(s):

Fuel Cell ◽

Solid Oxide Fuel Cell ◽

Hollow Fiber ◽

Stability Study ◽

Solid Oxide ◽

Oxide Fuel ◽

Triple Layer

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Thermomechanics of Solid Oxide Fuel Cell Electrode Microstructures Using Finite Element Methods: Progressive Interface Degradation under Thermal Cycling

Selected Problems of Contemporary Thermomechanics ◽

10.5772/intechopen.76118 ◽

2018 ◽

Author(s):

Sushrut Vaidya ◽

Jeong ho Kim

Keyword(s):

Finite Element ◽

Fuel Cell ◽

Thermal Cycling ◽

Solid Oxide Fuel Cell ◽

Finite Element Methods ◽

Solid Oxide ◽

Oxide Fuel ◽

Fuel Cell Electrode ◽

Cell Electrode

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Life Prediction of a Solid Oxide Fuel Cell Under Thermal Cycling Conditions

ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology ◽

10.1115/fuelcell2009-85131 ◽

2009 ◽

Cited By ~ 1

Author(s):

Lin Liu ◽

Gap-Yong Kim ◽

Abhijit Chandra

Keyword(s):

Fuel Cell ◽

Thermal Cycling ◽

Solid Oxide Fuel Cell ◽

Life Prediction ◽

Thermal Stresses ◽

Crack Nucleation ◽

Free Edge ◽

Solid Oxide ◽

Shear Stresses ◽

Oxide Fuel

Typical operating temperature of a solid oxide fuel cell (SOFC) is above 600°C, which leads to severe thermal stresses caused by the difference in coefficients of thermal expansion (CTE) during thermal cycling. Interfacial and peeling stresses are two types of thermal stress that cause the mechanical failure of the SOFC. The paper develops a mathematical model to estimate thermal stresses in a typical electrolyte-supported SOFC (NiO/8YSZ-YSZ-LSM). The proposed model is then utilized to obtain analytical expressions for interfacial and peeling stresses. This model provides insight into the distribution of interfacial and peeling stresses of SOFCs and the cause of catastrophic failure. A model for crack nucleation in multi-layered structures under thermal cycling is generalized and utilized in this study for the life prediction. It is found that the peeling and interfacial shear stresses are more concentrated near free edge areas. The relevant damage evolution rate accelerates as the crack propagates. The work also provides a foundation for future SOFC reliability and life prediction research.

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