Performance of microtubular SOFCs with infiltrated electrodes under thermal cycling

Howe, K.S.; Hanifi, Amir Reza; Kendall, Kevin; Zazulak, Mark; Etsell, Thomas H.; Sarkar, Partha

doi:10.1016/j.ijhydene.2012.10.098

Cited by 27 publications

(18 citation statements)

References 33 publications

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“…This attenuation should be attributed to the electrode changes for aforementioned reasons. For example, the aggregation or part oxidation of impregnated Ni particle occurred during the repeatedly increasing and decreasing temperature [42]. However, comparing the conventional anode-supported MT-SOFC [1], the prepared cells is relatively stable in thermal cycles, consistent with the previous Ni impregnation process [44,45].…”

Section: Thermal Cycle Stabilitysupporting

confidence: 70%

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Highly stable microtubular solid oxide fuel cells based on integrated electrolyte/anode hollow fibers

Meng

Wang

Yang

et al. 2015

Journal of Power Sources

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Section: Thermal Cycle Stabilitysupporting

confidence: 70%

“…Generally, the thermal cycle degradation of the cells is due to the electrolyte cracking and the electrode alternations [42,43]. Electrolyte cracking leads to the drop of OCV because of the leakages of gases and electrons.…”

Section: Thermal Cycle Stabilitymentioning

confidence: 99%

Highly stable microtubular solid oxide fuel cells based on integrated electrolyte/anode hollow fibers

Meng

Wang

Yang

et al. 2015

Journal of Power Sources

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“…ε cathode =1.0 gave T=977 K, while for ε cathode =0.4 the temperature was equal to T=1040 K. It was concluded that there is a strong influence of cathode emissivity on the mSOFC temperature. The air temperature near the mSOFC walls was closest to the experimental value of 750 o C (Howe et al, 2013) for the cathode emissivity equal to 0.4.…”

Section: Approach 2 Influence Of Electrochemically-driven Non-uniforsupporting

confidence: 66%

Cfd Analysis of Heat Transfer in a Microtubular Solid Oxide Fuel Cell Stack

Pianko‐Oprych¹,

Касилова²,

Jaworski³

2014

Chemical and Process Engineering

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The aim of this work was to achieve a deeper understanding of the heat transfer in a microtubular Solid Oxide Fuel Cell (mSOFC) stack based on the results obtained by means of a Computational Fluid Dynamics tool. Stack performance predictions were based on simulations for a 16 anodesupported mSOFCs sub-stack, which was a component of the overall stack containing 64 fuel cells. The emphasis of the paper was put on steady-state modelling, which enabled identification of heat transfer between the fuel cells and air flow cooling the stack and estimation of the influence of stack heat losses. Analysis of processes for different heat losses and the impact of the mSOFC reaction heat flux profile on the temperature distribution in the mSOFC stack were carried out. Both radiative and convective heat transfer were taken into account in the analysis. Two different levels of the inlet air velocity and three different values of the heat losses were considered. Good agreement of the CFD model results with experimental data allowed to predict the operation trends, which will be a reliable tool for optimisation of the working setup and ensure sufficient cooling of the mSOFC stack.

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“…The most significant change is the decrease of the LF contribution for the CY cell under negative polarization (SOEC conditions), as a consequence of the optimized gas diffusion within the Ni-YSZ support. Positive impacts of using calcined YSZ in developing a porous YSZ microstructure for conversion to an anode or cathode upon infiltration has been previously shown by the authors1415161819212728. When cell infiltration for the purpose of improving the catalytic activity or the electronic/ionic conductivity (or both) of the anode is planned, an anode with larger pore size and higher porosity (~50%) than TY is desirable (due to pore clogging during infiltration).…”

Section: Resultsmentioning

confidence: 97%

Tailoring the Microstructure of a Solid Oxide Fuel Cell Anode Support by Calcination and Milling of YSZ

Hanifi

Laguna‐Bercero

Sandhu

et al. 2016

Sci Rep

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In this study, the effects of calcination and milling of 8YSZ (8 mol% yttria stabilized zirconia) used in the nickel-YSZ anode on the performance of anode supported tubular fuel cells were investigated. For this purpose, two different types of cells were prepared based on a Ni-YSZ/YSZ/Nd2NiO4+δ-YSZ configuration. For the anode preparation, a suspension was prepared by mixing NiO and YSZ in a ratio of 65:35 wt% (Ni:YSZ 50:50 vol.%) with 30 vol.% graphite as the pore former. As received Tosoh YSZ or its calcined form (heated at 1500 °C for 3 hours) was used in the anode support as the YSZ source. Electrochemical results showed that optimization of the fuel electrode microstructure is essential for the optimal distribution of gas within the support of the cell, especially under electrolysis operation where the performance for an optimized cell (calcined YSZ) was enhanced by a factor of two. In comparison with a standard cell (containing as received YSZ), at 1.5 V and 800 °C the measured current density was −1380 mA cm−2 and −690 mA cm−2 for the cells containing calcined and as received YSZ, respectively. The present study suggests that the anode porosity for improved cell performance under SOEC is more critical than SOFC mode due to more complex gas diffusion under electrolysis mode where large amount of steam needs to be transfered into the cell.

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Performance of microtubular SOFCs with infiltrated electrodes under thermal cycling

Cited by 27 publications

References 33 publications

Highly stable microtubular solid oxide fuel cells based on integrated electrolyte/anode hollow fibers

Highly stable microtubular solid oxide fuel cells based on integrated electrolyte/anode hollow fibers

Cfd Analysis of Heat Transfer in a Microtubular Solid Oxide Fuel Cell Stack

Tailoring the Microstructure of a Solid Oxide Fuel Cell Anode Support by Calcination and Milling of YSZ

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