The effect of loading and particle size on the oxygen reaction in CGO impregnated Pt electrodes

Lund, Anders; Jacobsen, Torben; Mogensen, Mogens Bjerg

doi:10.1007/s10008-011-1489-2

Cited by 3 publications

(2 citation statements)

References 35 publications

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“…6,[8][9][10] In a similar case, infiltration of gadolinia doped ceria (GDC) into porous Pt skeleton to enhance electrode performance has recently been reported. 22 It was shown that GDC infiltration improved the electrode performance significantly (from 3.9 Ohm.cm 2 to 0.7 Ohm.cm 2 per electrode at 700 • C). However, the mixed conductivity of GDC and the fact that it exhibits some catalytic activity for the oxygen reduction reaction needs to be considered for a comparison with the present work.…”

Section: Resultsmentioning

confidence: 95%

Solid Oxide Fuel Cells with Symmetrical Pt-YSZ Electrodes Prepared by YSZ Infiltration

Büyükaksoy¹,

Petrovsky²,

Doğan³

2013

J. Electrochem. Soc.

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Platinum electrodes for high temperature electrochemical devices (solid oxide fuel cells, solid oxide electrolyzer cells and sensors) generally show limited performances due to confinement of triple phase boundaries (TPBs) to the Platinum-electrolyte interface. Performance degradation as a result of TPB length loss due to the microstructural instability of the Platinum electrodes at operational temperatures is the other major problem. Infiltration of yttrium stabilized zirconia (YSZ) into porous Platinum electrodes using polymeric metal-oxide precursor was utilized as a prospective solution to these problems. It was shown that this process formed a YSZ coating on the Platinum particle surface which led to significantly increased effective contact area between Platinum electrodes and the electrolyte, and prevented the coarsening of Platinum. Symmetrical cells with YSZ infiltrated Platinum electrodes showed polarization resistance of 0.045 Ohm.cm 2 per cathode at 800 • C, in air. In fuel cell operation mode, the total electrode polarization resistance (anode + cathode) was 0.35 Ohm.cm 2 at 800 • C and 0.130 Ohm.cm 2 at 900 • C. Power densities of 0.45 Watt/cm 2 and 0.9 Watt/cm 2 at 800 • C and 900 • C were obtained respectively. No degradation of the cell was observed for the duration of measurement (248 hours).

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Section: Resultsmentioning

confidence: 95%

Solid Oxide Fuel Cells with Symmetrical Pt-YSZ Electrodes Prepared by YSZ Infiltration

Büyükaksoy¹,

Petrovsky²,

Doğan³

2013

J. Electrochem. Soc.

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“…By tuning the infiltration step or the concentration of the precursor, particles can either be deposited discretely or in a connected network. Another catalytic material doped ceria (XDC, X=Metal), attracted attention due to its flexibility of use either in the anode or cathode or even the electrolyte material [30,32,37,42,44,45,51,53,58,59,61,63,64,69,72,76,77,80,83,87,91,96,99,100,102,103,105,107,109,113,121,122,130,134,140,147] . For example, gadolinium-doped ceria (GDC) acts as an ionic conductor, and also by switching the valence character of ceria from +4 to +3 repeatedly, nanoparticles can achieve hydrogen storage capability.…”

Section: Electrochemical Performance Enhancement By Catalyst Infiltramentioning

confidence: 99%

Investigation of Nano-ceria Catalyst Infiltration of Solid Oxide Fuel Cell (SOFC) Electrodes Using Bio-Inspired Catechol Surfactants

Ozmen¹

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Investigation of Nano-ceria Catalyst Infiltration of Solid Oxide Fuel Cell (SOFC) Electrodes Using Bio-Inspired Catechol Surfactants Ozcan Ozmen Development of solid oxide fuel cell (SOFC) electrodes with nano-structured grains can show enhanced power density with high catalytic activity owing to the higher surface area to volume ratio of the particles. However, the addition of nano-particles during the conventional electrode manufacturing process causes inevitable structural changes due to the coarsening of nano-particles at sintering temperatures. Wet impregnation/ infiltration methods are a practical and well-utilized method to form nanoparticles within the porous electrode microstructure of solid oxide fuel cells (SOFC) which requires relatively low calcination temperatures. Critical factors that impact the reduction of the electrode polarization using the nano-catalyst impregnation strategy include catalyst loading, decoration type, and volumetric distribution homogeneity through the porous electrode microstructure. These can mostly be tuned by performing repetitive infiltration cycles followed by a co-firing step after each cycle for calcination. This labor and timeintensive method continues until the desired nano-catalyst loading is achieved. The factors that may degrade the performance as inter-particle interactions, pore-clogging, and/or inhomogeneous deposition result in gas diffusion related to rapid cell voltage degradation issues. The objective of this work is to investigate organic electrode modifiers to enhance nanocatalyst infiltration efficiency and uniformity within a commercial nickel oxide (NiO)/ yttria stabilized zirconia (YSZ) anode support and lanthanum strontium manganite (LSM)/YSZ cathode systems. The aim is to reduce the process to minimal processing steps while increasing both the performance and stability of the SOFC by decorating the nano-catalyst deposition. In this study, nano-CeO2, ceria, was used as a redox catalyst system and efficiently inserted throughout both porous SOFCs electrodes simultaneously by using a bio-inspired surfactant-assisted infiltration protocol. The process includes the initial modification of the electrode pore walls with a catecholbased surfactant film, i.e., poly-dopamine (pDA), poly epinephrine (pNE) or other alternative surfactants from the catechol family. The nano-ceria layer is then deposited uniformly over the bio-template surfactant layer during a single submersion of the SOFC into a cerium salt solution. Voltage-current-power curves and impedance spectroscopy were used to characterize the electrochemical performance of the impregnated anode-supported SOFC button cells. The endgoal of the work was to develop an infiltration protocol that performs boosted initial power density (performance) with high-stability by mitigating the nano-catalyst coarsening. The infiltrated cells displayed up to 35% reduction in polarization over the baseline cell with high electrochemical stability during 300 hours of testing at 750 o C. The catechol surfactant depositio...

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Efficient and controlled nano-catalyst solid-oxide fuel cell electrode infiltration with poly-norepinephrine surface modification

Ozmen

Lee

Hackett

et al. 2021

Journal of Power Sources

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The effect of loading and particle size on the oxygen reaction in CGO impregnated Pt electrodes

Cited by 3 publications

References 35 publications

Solid Oxide Fuel Cells with Symmetrical Pt-YSZ Electrodes Prepared by YSZ Infiltration

Solid Oxide Fuel Cells with Symmetrical Pt-YSZ Electrodes Prepared by YSZ Infiltration

Investigation of Nano-ceria Catalyst Infiltration of Solid Oxide Fuel Cell (SOFC) Electrodes Using Bio-Inspired Catechol Surfactants

Efficient and controlled nano-catalyst solid-oxide fuel cell electrode infiltration with poly-norepinephrine surface modification

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