Thermal shock resistance and failure probability analysis on solid oxide electrolyte direct flame fuel cells

Wang, Yuqing; Shi, Yixiang; Yu, Xiankai; Cai, Ningsheng

doi:10.1016/j.jpowsour.2014.01.035

Cited by 25 publications

(12 citation statements)

References 30 publications

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“…Direct flame fuel cells (DFFCs) are novel energy conversion devices that consist of a solid oxide fuel cell (SOFC) in direct contact with a flame to generate power [1,2]. The flame acts as a partial oxidation reformer that can operate on a wide variety of solid, liquid and gaseous fuels while simultaneously providing heat for the SOFC operation [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Within the flame, H 2 and CO (syngas) and unburned hydrocarbons are available for electrochemical conversion in the SOFC.…”

Section: Introductionmentioning

confidence: 99%

Micro-tubular flame-assisted fuel cells running methane

Milcarek

Garrett

Wang

et al. 2016

International Journal of Hydrogen Energy

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Direct flame fuel cells (DFFCs) have been investigated as an alternative means of combustion based power generation devices, but current challenges for this technology have included low fuel utilization and efficiency. In order to overcome these obstacles a new micro-tubular flame-assisted fuel cell (mT-FFC) concept is developed in this work and its performance is assessed at different equivalence ratios and temperatures. The concept is based on fuel-rich combustion exhaust, with the combustion equivalence ratio controlled and the exhaust flowing through the fuel cell for complete electrochemical energy conversion. The results were compared to a hydrogen baseline with the same electron potential as the fuel-rich exhaust. The mT-FFC concept offers significant advantages including high fuel utilization and greater performance stability compared to DFFCs.

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Section: Introductionmentioning

confidence: 99%

Micro-tubular flame-assisted fuel cells running methane

Milcarek

Garrett

Wang

et al. 2016

International Journal of Hydrogen Energy

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“…13 Then during the SOFC operation stage, thermal stress is raised due to the inhomogeneous temperature distribution caused by additional heat released or consumed from electrochemical reaction (reversible and irreversible heat) and chemical reaction (fuel reforming and water gas shift reaction in the anode side). 14,15 Besides, the chemical expansion (CE) occurs in some oxygen ion-conducting ceramic materials of the SOFC as its defect concentration changes under different operating conditions. 16,17 As to the long-term operation of SOFC, stress distribution within components is strongly affected by the creep effect.…”

Section: List Of Symbolsmentioning

confidence: 99%

“…Since the structure of the button cell is similar to a threelayer system, 15 it can be further explained by the change of Δα c (=α ca −Δα ele ), Δα a (=α an −α ele ) as shown in Fig. 5c.…”

Section: Materials B (Mpamentioning

confidence: 99%

Thermo-Electro-Chemo-Mechanical Modeling of Solid Oxide Fuel Cell for Stress and Failure Evolution during Duty Cycle

Wu¹,

Xu²,

Yan³

et al. 2021

J. Electrochem. Soc.

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A comprehensive three-dimensional model for an assembled button solid oxide fuel cell is developed by coupling thermal-electrochemical and mechanical models. Different mechanical effects including residual strain, thermal strain, accelerated and normal creep, mechanical properties change of anode, as well as chemical expansion are considered. The mechanical response of the button cell subjected to an idealized duty cycle from the as-fabricated state, heating-up stage, reduction stage, to three operation periods of 800 °C, 700 °C, and 600 °C is numerically simulated. Simulations are based on and validated by the experimental polarization curves and residual stress curve. Results show that the sealant is susceptible to fracture at the as-fabricated state, while the cathode is likely to fail during heating-up stage. The accelerated creep effect during reduction significantly eliminates the tensile stress in the anode nevertheless leads to higher stress in the cathode and electrolyte. It indicates that the assumption of zero-stress temperature at the reduction point could cause an underestimation of stress in the cathode and electrolyte in the case of a constrained cell. The chemical expansion effect in the cathode is more prominent at higher operating temperatures. A minimum failure probability of the cell is found at 700 °C with consideration of chemical expansion.

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“…Fuel cells can operate virtually continuously as long as the necessary flows are maintained. Fuel cells are different from electrochemical cell batteries in that they consume reactant from an external source, which must be replenished: a thermodynamically open system [31]. By contrast, batteries store electrical energy chemically and hence represent a thermodynamically closed system.…”

Section: Fuel Cellsmentioning

confidence: 99%

Review on Progress and Challenges of the Power Generation Systems at Micro-Scales

Chen

2015

ILCPA

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The miniaturization of electro-mechanical devices, and the resulting need for micro-power generation (milliwatts to watts) with low weight, long life devices, has led to the recent development of the field of micro-scale combustion and power generation. The primary objective of this new field is to leverage the high energy density of fuels, specifically liquid hydrocarbon fuels relative to batteries and all other energy storage devices other than nuclear fission, fusion or decay. Some brief scaling arguments are given in this work, and more detailed efforts are referred. A brief introduction to several of the fabrication techniques is presented in this work. Hydrogen-based and some preliminary specialty fuel micro-fuel cells have been successfully developed, and there is a need to develop reliable reformers (or direct conversion fuel cells) for liquid hydrocarbons so that the fuel cells become competitive with the batteries. In this work, the technological issues related to micro-scale combustion and the development of thermochemical devices for power generation will be discussed. Some of the systems currently being developed will be presented, ongoing critical study issues under investigation, and other potential areas of development discussed. Comments regarding the opportunities and limitations of each of the techniques are also presented where applicable.

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Thermal shock resistance and failure probability analysis on solid oxide electrolyte direct flame fuel cells

Cited by 25 publications

References 30 publications

Micro-tubular flame-assisted fuel cells running methane

Micro-tubular flame-assisted fuel cells running methane

Thermo-Electro-Chemo-Mechanical Modeling of Solid Oxide Fuel Cell for Stress and Failure Evolution during Duty Cycle

Review on Progress and Challenges of the Power Generation Systems at Micro-Scales

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