Degradation of (La0.6Sr0.4)0.95(Co0.2Fe0.8)O3−δ Solid Oxide Fuel Cell Cathodes at the Nanometer Scale and below

Ni, Na; Cooper, Samuel J.; Williams, Robert E.A.; Kemen, Nils; McComb, David W.; Skinner, Stephen J.

doi:10.1021/acsami.6b05290

Cited by 58 publications

(59 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The comparison of the three cells shows an increase of the polarization resistance with increasing Cr content, especially in the low frequency range. This is in good agreement with literature, in which cathode-related processes are also assigned to this part of the frequency range (Konysheva, 2014;Ni et al, 2016). Most importantly, the data show that the Cr treatment seems to have a similar effect on the impedance spectra regardless of the poisoning technique.…”

Section: Electrochemical Impedance Measurementssupporting

confidence: 92%

“…This method would not be suitable for an LSM/8YSZ composite cathode, as the Crcontaining phase is normally located at the interface between the cathode layer and the electrolyte (Taniguchi et al, 1995;Matsuzaki and Yasuda, 2001). For these cathodes, a method such as that proposed by Ni et al might be an alternative (Ni et al, 2016). This method utilizes a Cr-nitrate solution to infiltrate the cathode, allowing a direct interaction between the electrochemically active sites of the cathode and the Cr species.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Accelerated Testing of Chromium Poisoning of Sr-Containing Mixed Conducting Solid Oxide Cell Air Electrodes

et al. 2018

View full text Add to dashboard Cite

A straightforward method for accelerated testing of Cr poisoning phenomena on mixed ionic and electronic conducting (MIEC) Solid Oxide Cell (SOC) air electrode materials was developed. Cr 2 O 3 -powder is mixed with an organic matrix and screen printed onto anode-supported button cells with (La,Sr)(Co,Fe)O 3−δ (LSCF) cathode. Then, a thermal treatment was conducted to achieve the formation of a well-defined amount of SrCrO 4 on the cathode surface within only a few hours. For the proof of concept, single cell measurements were done to investigate the influence of this new kind of Cr deposition. As reference, a cell poisoned via gas phase diffusion and a cell without any Cr contamination were characterized in the same manner. According to the impedance data, the polarization resistance for both cells, which were contaminated with Cr species, increased. The expected relationship between deposited amount of Cr and increase of polarization resistance was found. ICP-OES analysis proves the high reproducibility of the method as the Cr content is only a function of the Cr paste composition and almost independent of external poisoning conditions. Due to its scalability and reproducibility, this method is proposed to be a new tool for screening of cathode materials and the investigation of different stages of Cr poisoning prior to more sophisticated and time consuming investigations like stack tests.

show abstract

Section: Electrochemical Impedance Measurementssupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Accelerated Testing of Chromium Poisoning of Sr-Containing Mixed Conducting Solid Oxide Cell Air Electrodes

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Besides BSCF, LSCF is another important MIEC membrane material which have been widely investigated by many groups . The permeation data of LSCF were analyzed by Zhu's model, and the difference between experimental data and calculated data is seemingly receivable, as shown in Figure a, but the value of permeation resistance constant of interfacial I(

r_{0}^{'}

) is extremely small in the temperature range of 950°C to 875°C, as shown in Table .…”

Section: Resultsmentioning

confidence: 99%

“…Besides BSCF, LSCF is another important MIEC membrane material which have been widely investigated by many groups. 47,48 The permeation data of LSCF were analyzed by Zhu's model, and the difference between experimental data and calculated data is seemingly receivable, as shown in Figure 3a, but the value of permeation resistance constant of interfacial I(r 0 0 ) is extremely small in the temperature range of 9508C to 8758C, as shown in Table 2. However, the value of r 0 0 seems normal when the operation temperature is lower than 8508C on account of a disordering-ordering transition of oxygen vacancies, 49 which will be discussed later.…”

Section: Permeation Model Analysis Of Bscf and Lscfmentioning

confidence: 99%

Selection of oxygen permeation models for different mixed ionic‐electronic conducting membranes

Zhu

Liu

et al. 2017

AIChE Journal

View full text Add to dashboard Cite

Permeation data of several mixed ionic‐electronic conducting (MIEC) membranes were analyzed by two oxygen permeation models (i.e., Zhu's model and Xu–Thomson's model), respectively, to find a concise method to guide the choice of permeation models. We found that Zhu's model can well fit the permeation data of perovskite‐type membranes, like Ba0.5Sr0.5Co0.8Fe0.2O3‐δ (BSCF) and BaCe0.05Fe0.95O3‐δ (BCF), and dual‐phase membranes, like 75 wt % Ce0.85Sm0.15O1.925–25 wt % Sm0.6Sr0.4Al0.3Fe0.7O3‐δ (SDC‐SSAF), whose oxygen vacancy concentrations are almost independent of the oxygen partial pressure at elevated temperatures. However, Zhu's model was not appropriate for membranes whose oxygen vacancy concentration changed obviously with oxygen partial pressure at elevated temperatures, such as La0.6Sr0.4Co0.2Fe0.8O3‐δ (LSCF) and La0.7Sr0.3CoO3‐δ (LSC). On the contrary, Xu–Thomson's model can fit the data of LSCF and LSC well, but it is inapplicable for BSCF, BCF, and SDC‐SSAF. Therefore, the dependence of oxygen vacancy concentration on oxygen partial pressure was suggested as an index for the selection of the permeation models. © 2017 American Institute of Chemical Engineers AIChE J, 63: 4043–4053, 2017

show abstract

“…However, the surface segregation of Sr-containing cobaltite oxygen electrodes and the combination of segregated Sr with volatile species such as chromium and sulphur constitute a major degradation mechanism of SOC stacks. [10][11][12][13][14][15][16][17] One straightforward means to address this critical issue is to develop Sr-free cobaltite electrodes, 18 such as La(Co,Fe) x Pd 1Àx O 3Àd . 19,20 Recently, we have successfully developed a high performance Sr-free Sm 0.95 CoO 3Àd electrode doped with 5% Pd in the B-site of the perovskite structure (SmCPd) and assembled it on a barrier-layer-free Y 2 O 3 -ZrO 2 (YSZ) electrolyte.…”

Section: Introductionmentioning

confidence: 99%

High performance nanostructured bismuth oxide–cobaltite as a durable oxygen electrode for reversible solid oxide cells

Chen

et al. 2018

J. Mater. Chem. A

View full text Add to dashboard Cite

show abstract

Degradation of (La_0.6Sr_0.4)_0.95(Co_0.2Fe_0.8)O_3−δ Solid Oxide Fuel Cell Cathodes at the Nanometer Scale and below

Cited by 58 publications

References 69 publications

Accelerated Testing of Chromium Poisoning of Sr-Containing Mixed Conducting Solid Oxide Cell Air Electrodes

Accelerated Testing of Chromium Poisoning of Sr-Containing Mixed Conducting Solid Oxide Cell Air Electrodes

Selection of oxygen permeation models for different mixed ionic‐electronic conducting membranes

High performance nanostructured bismuth oxide–cobaltite as a durable oxygen electrode for reversible solid oxide cells

Contact Info

Product

Resources

About