Impedance and Stability of M/CGO (M: Ni, Pd, Ru) Co-infiltrated Nb-doped SrTiO3 SOFC Anodes

Ramos, Tânia; Veltzé, Sune; Sudireddy, Bhaskar Reddy; Holtappels, Peter

doi:10.1149/2.002402eel

Cited by 20 publications

(30 citation statements)

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“…Unlike Ni/CGO, with an initial 1 mV h ±1 and a long-term 0.5 mV h ±1 degradation rates, CGO and Ru/CGO showed significantly lower long-term degrada- [4]. This is in accordance with the IP trend and also with symmetric cell results obtained for nominally equivalent infiltrates [6]. This is in accordance with the IP trend and also with symmetric cell results obtained for nominally equivalent infiltrates [6].…”

Section: Resultssupporting

confidence: 89%

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Effect of Ru/CGO versus Ni/CGO Co‐Infiltration on the Performance and Stability of STN‐Based SOFCs

et al. 2014

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Electrolyte supported cells (ESC), with Sc2O3‐stabilized ZrO2 (ScSZ) electrolytes, Gd‐doped ceria (CGO) or M/CGO (M = Ni, Ru) infiltrated Sr0.94Ti0.9Nb0.1O3 (STN94) anodes and LSM/YSZ cathodes, were evaluated for their initial performance and long‐term stability. Power density for the Ru/CGO infiltrated cell reached ∼0.7 W cm–2 at 850 °C, 4% H2O/H2, whereas the Ni/CGO infiltrated cell reached ∼0.3 W cm–2, with the current morphologies and loadings. Operation at 0.125 A cm–2, 850 °C, feeding 50% H2O/H2 to the anode and air to the cathode, for a period >300 h, showed superior stability for the Ru/CGO infiltrated cell, with ∼0.04 mV h–1 degradation rate, when compared to the Ni/CGO infiltrated cell (∼0.5 mV h–1). For the Ni/CGO case, the observed degradation has been tentatively linked to initial changes in the electrochemical active area and long‐term detrimental interactions between components.

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Section: Resultssupporting

confidence: 89%

“…Recently, Ru/CGO has been reported as a potentially stable infiltrate composition in Sr 0.94 Ti 0.9 Nb 0.1 O 3 (STN94)/ YSZ SOFC anodes [6]. However, those studies concerned only electrochemical impedance spectroscopy (EIS) measurements at OCV.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ru/CGO versus Ni/CGO Co‐Infiltration on the Performance and Stability of STN‐Based SOFCs

et al. 2014

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“…Combined Raman and EIS measurements compare the spectroscopic and electrochemical behavior of SOFCs having STN electrodes infiltrated with nickel and cobalt nano‐catalysts added to improve electrocatalytic activity. Notably, the nanosized electrocatalyst was, in this work, infiltrated without co‐infiltrating CGO, since CGO itself increases an electrode's coking tolerance , . By infiltrating the transition metals without CGO, experiments are able to isolate the impact of the individual transition metals to the electrode's overall coking tolerance.…”

Section: Methodsmentioning

confidence: 99%

“…Recent work reported by T. Ramos et al. showed that materials, such as B‐site deficient Sr 0.94 Ti 0.9 Nb 0.1 O 3 (STN94), could compete with state of the art Ni‐YSZ cermet electrodes, if an electrocatalyst like ruthenium or palladium and a mixed ionic electronic conductor such as gadolinium doped cerium oxide (CGO) were co‐infiltrated into an STN scaffold , . Unfortunately, both ruthenium and palladium are precious metals and hence too costly to be used in any commercialization strategy.…”

Section: Introductionmentioning

confidence: 99%

Testing Novel Nickel and Cobalt Infiltrated STN Anodes for Carbon Tolerance using In Situ Raman Spectroscopy and Electrochemical Impedance Spectroscopy

et al. 2019

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Conventional SOFCs use Nickel Yttria‐doped Zirconia cermet anodes, which are susceptible to degradation due to coking when operating with carbon containing fuels. Raman spectroscopy is a powerful tool for investigating surface chemistry and, when combined with electrochemical impedance spectroscopy under in situ conditions, the technique can report the real‐time material composition of the electrode during the EIS measurements. Studies described in this work used in situ Raman spectroscopy and electrochemical impedance spectroscopy to examine the carbon tolerance of novel ceramic anode materials comprised of niobium doped strontium titanate infiltrated with nickel or cobalt nanoparticles. The susceptibility of these electrodes to coking were tested with CO/CO2 mixtures and pure methane at 850 °C. Data show that nickel‐infiltrated STN electrodes are still prone to coking from methane. In contrast to STN electrodes infiltrated with nickel, cobalt‐infiltrated STN electrodes showed no susceptibility to carbon deposition during methane exposure within the detection limit of the Raman measurements. Neither anode showed evidence of coking from the CO/CO2 mixtures. Coking correlated closely with changes in EIS measurements, with the most noticeable effects appearing in the low frequency part of the spectrum. Ex situ SEM analysis of samples before and after operation illustrates the growth of the nanoparticles.

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“…This includes fabrication an electrode backbone, then infiltrating an aqueous salt precursor solution into the porous structure followed by calcination at temperatures typically only slightly higher than operating temperature. This technique helps bypass the high temperature methods by depositing catalytic nanoparticles inside the active porous electrode , . The nano particles may form continuous layers or discrete particles on the inner electrode surface.…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement of an Inhomogeneous Cathode by Infiltration

et al. 2017

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The performance of solid oxide fuel cells (SOFCs) is considerably influenced by the microstructure and chemical composition of cathode materials. Porous La0.85Sr0.15FeO3–Ce0.9Gd0.1O2 composite electrodes were infiltrated by La0.6Sr0.4CoO3 and La0.6Sr0.4FeO3. The effects of infiltration loading, calcination temperature of infiltrated material and co‐infiltration of LSC and LSF were investigated using electrochemical impedance measurement, microstructural analysis, and high‐temperature X‐ray diffraction (HT‐XRD). A symmetrical cell two‐electrode configuration was used to examine the electrochemical performance of the electrodes. The electrochemical results revealed that the polarization resistance of the cathodes significantly was decreased by infiltration from 2.59 to 0.034 Ω cm2 measured at 670 °C. The best electrode performance was achieved at a calcination temperature of 770 °C. It was also found that infiltration of LSC improved the stability of the electrodes during 145 h of testing at 620 °C in air at open circuit voltage (OCV).

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Impedance and Stability of M/CGO (M: Ni, Pd, Ru) Co-infiltrated Nb-doped SrTiO3 SOFC Anodes

Cited by 20 publications

References 0 publications

Effect of Ru/CGO versus Ni/CGO Co‐Infiltration on the Performance and Stability of STN‐Based SOFCs

Effect of Ru/CGO versus Ni/CGO Co‐Infiltration on the Performance and Stability of STN‐Based SOFCs

Testing Novel Nickel and Cobalt Infiltrated STN Anodes for Carbon Tolerance using In Situ Raman Spectroscopy and Electrochemical Impedance Spectroscopy

Performance Improvement of an Inhomogeneous Cathode by Infiltration

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