High‐Performance SOFC Cathodes Prepared by Infiltration

Vohs, John M.; Gorte, Raymond J.

doi:10.1002/adma.200802428

Cited by 666 publications

(509 citation statements)

References 139 publications

(190 reference statements)

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“…mechanical support, ionic conductivity, electronic conductivity, oxidation/reduction electrocatalyst) has led to many researchers adopting this approach in SOC development. Some excellent comprehensive reviews have already been written on this subject and are referred to for a complete overview 4,[70][71][72][73] . This review aims to highlight some recent advances that constitute a step change for impregnated SOC technology, be it in performance, processing or scale.…”

Section: Impregnationmentioning

confidence: 99%

“…Cobaltites and ferrites, such as La1-xSrxCo1-yFeyO3- (LSCF) and Sm0.5Sr0.5CoO3- (SSC) are promising oxygen-electrode materials in intermediate temperature fuel cells due to their high ionic conductivities, but have stability issues due to their reactivity with zirconia at typical sintering temperatures. The unique low processing temperatures during impregnation are an effective way of avoiding such reactions 70,73 . Surface modification may be used for reasons other than promoting catalytic activity or adding conduction pathways.…”

Section: Impregnationmentioning

confidence: 99%

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Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

et al. 2016

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Section: Impregnationmentioning

confidence: 99%

Section: Impregnationmentioning

confidence: 99%

Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

et al. 2016

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“…First, a broader choice of electrode materials is possible because materials that melt or chemically react with the electrolyte at conventional sintering temperatures can be considered. [1][2][3][4][5][6] Second, a higher three-phase boundary (TPB) density can be achieved, which is attributed to the smaller particle sizes. 2,3,[7][8][9] These two advantages result from a lower processing temperature of the infiltrated phase compared to conventional sintering temperatures required of co-sintered electrodes.…”

mentioning

confidence: 99%

Insights into the Design of SOFC Infiltrated Electrodes with Optimized Active TPB Density via Mechanistic Modeling

Reszka

Snyder

Gross

2014

J. Electrochem. Soc.

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A mechanistic model for the prediction of total and active three phase boundary density (TPB), in combination with effective conductivity, of infiltrated solid oxide fuel cell (SOFC) electrodes is presented. Varied porosities, scaffold:infiltrate size ratios, and pore:infiltrate size ratios were considered, each as a function of infiltrate loading. The results are presented in dimensionless form to allow for the calculation of any infiltrate particle size. The model output compares favorably to the available experimental result. The results show that the scaffold:infiltrate size ratio has the greatest impact on the TPB density, followed by the porosity and then the pore:infiltrate size ratio. The TPB density is shown to monotonically decrease with increasing scaffold:infiltrate and pore:infiltrate size ratios; however, it shows a maximum with respect to porosity. Each of these results are explained by examining the interfacial areas of each of the three phases as a function of the infiltrate loading. The model provides insight toward the rational design of infiltrated electrodes. Infiltrated solid oxide fuel cell (SOFC) electrodes offer numerous advantages over conventional co-sintered electrodes. First, a broader choice of electrode materials is possible because materials that melt or chemically react with the electrolyte at conventional sintering temperatures can be considered.1-6 Second, a higher three-phase boundary (TPB) density can be achieved, which is attributed to the smaller particle sizes.2,3,7-9 These two advantages result from a lower processing temperature of the infiltrated phase compared to conventional sintering temperatures required of co-sintered electrodes.Three additional advantages of infiltrated electrodes are associated with the unique morphology created by coating the surface of a presintered porous scaffolding with an infiltrated phase. The first morphological advantage is a mitigation of the coefficient of thermal expansion (CTE) mismatch between the electrolyte and the electrode. 10,11The second advantage is a stabilization of the electrode mechanical properties during redox cycling, 5,12 Finally, less material is needed to form an interconnected network of the infiltrated phase throughout the electrode. 6,10,[12][13][14][15] Although the benefits of infiltrated electrodes have been clearly demonstrated experimentally, researchers suggest that the electrode designs are not optimized. 3,5,6,14,16 This is understandable because it is laborious to consider all of the combinations and permutations of the sizes and shapes of infiltrate particles, scaffold particles, and pores as well as the wide range of possible porosities. In order to more effectively and efficiently design electrodes, several computational models have been recently reported. Zhang et al. utilized a particle-layer model to estimate the TPB density, effective thickness of the electrochemically active region, and polarization resistance of cathodes.9 A more recent report by Zhang et al. utilized a numerically generated thr...

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“…To address this issue, two major approaches have been considered: using alternative anode materials with a high coking tolerance or co-feeding the fuel with a high concentration of oxidizing agents such as air, CO 2 , or water. [14][15][16][17][18][19] In our previous work we successfully produced a novel MoO 2 -based anode with an exceptionally high coking resistance for liquid hydrocarbons such as n-dodecane and biodiesel at an operating temperature of 850 8C. [20] The procedure developed in our group, which is based on the electrostatic spray deposition (ESD) method, has opened up the possibility of developing liquid hydrocarbon-fueled SOFCs.…”

mentioning

confidence: 99%

Retraction: High‐Performance Molybdenum Dioxide‐Based Anode for Dodecane‐Fueled Solid‐Oxide Fuel Cells (SOFCs)

Kwon¹,

Hu²,

Marin‐Flores³

et al. 2017

Energy Tech

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High‐Performance SOFC Cathodes Prepared by Infiltration

Cited by 666 publications

References 139 publications

Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

Insights into the Design of SOFC Infiltrated Electrodes with Optimized Active TPB Density via Mechanistic Modeling

Retraction: High‐Performance Molybdenum Dioxide‐Based Anode for Dodecane‐Fueled Solid‐Oxide Fuel Cells (SOFCs)

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