Protective coatings based on Mn-Co spinel for current collectors of solid oxide fuel cells

Бредихин, С. И.; Zhokhov, A. A.; Frolova, E. A.; Ledukhovskaya, Nataliya; Курицына, И. Е.; Синицын, В. В.; Korovkin, E. V.

doi:10.1134/s1023193509050036

Cited by 7 publications

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The discs were dipped into a saturated NiCl 2 solution in aqueous HCl, heated up to 70-80°C for surface oxide film removal and adhesion improvement. Then Ni layers (thickness of 6-16 μm) were applied as described elsewhere (7,8). The Ni-coated Crofer 22APU samples were annealed in a vacuum furnace at 1050°C.…”

Section: Methodsmentioning

confidence: 99%

“…This problem may only be solved employing protective coatings (5). As the interconnect oxidation at the cathode side is responsible for over 30% SOFC stack degradation, the protective coatings minimizing the ASR should provide lifetimes of, at least, 30000 hours (6)(7)(8)(9)(10).…”

Section: Introductionmentioning

confidence: 99%

“…In previous works (7,8), a new approach for forming barrier layers impeding Cr diffusion to the metallic current collector surface was proposed and tested. The resultant Ni coatings were found to provide low ASR of the «current collector -LSM cathode» junctions, varying in the range 5 -10 mOhm•cm 2 during prolonged tests (up to 30,000 hours) at 850°C in air under a load current of 0.5 A/cm 2 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Interdiffusion and Charge Transport Across Surface-Modified Current Collectors in Planar SOFCs

Demeneva¹,

Матвеев²,

Хартон³

et al. 2015

ECS Trans.

View full text Add to dashboard Cite

Current collectors are a key component of planar SOFCs, separating air and fuel supplied onto the electrodes and connecting the cells in series. One of main challenges in the SOFC technology developments is to suppress degradation processes, often associated with the interconnect materials, and to provide low contact resistivity in oxidizing atmospheres. The present work is focused on the studies of near-surface interdiffusion phenomena in Crofer 22 APU ferritic steel interconnects with Ni-based protective layers. Particular emphasis was centered on the area-specific resistance (ASR) between the current collectors and La0.8Sr0.2MnO3 (LSM) cathodes, which exhibits time dependencies governed by the protective interlayer composition and interface microstructure alterations. The ASR changes, tested during over 30,000 hours at atmospheric oxygen pressure, can be described in terms of a model assuming that the current across the interconnector | LSM interface is essentially controlled by electron transfer via the interfacial Schottky barrier. The experimental observations validate this approach, explaining the junction resistivity and Schottky barrier height variations as a result of metal interdiffusion between the current collector and Ni-based protective coating.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Interdiffusion and Charge Transport Across Surface-Modified Current Collectors in Planar SOFCs

Demeneva¹,

Матвеев²,

Хартон³

et al. 2015

ECS Trans.

View full text Add to dashboard Cite

show abstract

“…Starting solution containing the desired composition of corresponding Mn and Co cations was prepared as mixture solutions of organic acids (CH 3 (CH 2 ) 3 CH(C 2 H 5 )COOH) and metal salts of organic acids (carboxylates) M[CH 3 (CH 2 ) 3 CH(C 2 H 5 )COO] n , where M is Mn or Co. This composition was chosen according to our previous study (4). An electrostatic field (up to 30 kV) was applied between the organometallic solutions of metal carboxylates and heating plate.…”

Section: Methodsmentioning

confidence: 99%

Oxidation Behavior and Electrical Conductivity between Ln_0.8Sr_0.2MnO₃ Cathode and Crofer 22 APU with Spinel Coatings

et al. 2009

View full text Add to dashboard Cite

The modified method of electrostatic spray pyrolysis was designed to apply protective coatings based on Mn-Co spinel to ferritic stainless steels (Crofer22APU and 08X18T1). The comparative thermogravimetric (TG) studies of ferrite stainless steels with and without protective coatings were carried out. The electrochemical characteristics of protective coatings exposed to long current loading were studied. The formation of the Mn-Cr spinel observed and studied at the contact between the ferrite stainless steel and the Mn-Co spinel. The coatings of Mn-Co spinel were shown preventing formation of continuous Cr2O3 oxide film on the stainless steel surface.

show abstract

“…Namely, the electric conductivity for CMO and NFO is 60 and 0.26 S·cm –1 at 800 °C, respectively . In addition, this material is of some interest as a cathode for solid oxide fuel cells (SOFCs) because it is commonly used as a current collector in SOFC stacks. , Improving the electrical conductivity could allow for a lower amount of the electronic phase, thus increasing the amount of the ionic conductivity phase while remaining stable under CO 2 . This would result in higher ambipolar transport, thus boosting oxygen permeation.…”

Section: Introductionmentioning

confidence: 99%

Co₂MnO₄/Ce_0.8Tb_0.2O_2−δ Dual-Phase Membrane Material with High CO₂ Stability and Enhanced Oxygen Transport for Oxycombustion Processes

Laqdiem,

Garcia-Fayos,

Carrillo

et al. 2023

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Oxygen transport membranes (OTMs) are a promising oxygen production technology with high energy efficiency due to the potential for thermal integration. However, conventional perovskite materials of OTMs are unstable in CO 2 atmospheres, which limits their applicability in oxycombustion processes. On the other hand, some dual-phase membranes are stable in CO 2 and SO 2 without permanent degradation. However, oxygen permeation is still insufficient; therefore, intensive research focuses on boosting oxygen permeation. Here, we present a novel dual-phase membrane composed of an ion-conducting fluorite phase (Ce 0.8 Tb 0.2 O 2−δ , CTO) and an electronic-conducting spinel phase (Co 2 MnO 4 , CMO). CMO spinel exhibits high electronic conductivity (60 S•cm −1 at 800 °C) compared to other spinels used in dual-phase membranes, i.e., 230 times higher than that of NiFe 2 O 4 (NFO). This higher conductivity ameliorates gas−solid surface exchange and bulk diffusion mechanisms. By activating the bulk membrane with a CMO/ CTO porous catalytic layer, it was possible to achieve an oxygen flux of 0.25 mL•min −1 •cm −2 for the 40CMO/60CTO (% vol ), 680 μm-thick membrane at 850 °C even under CO 2 -rich environments. This dual-phase membrane shows excellent potential as an oxygen transport membrane or oxygen electrode under high CO 2 and oxycombustion operation.

show abstract

Protective coatings based on Mn-Co spinel for current collectors of solid oxide fuel cells

Cited by 7 publications

References 5 publications

Interdiffusion and Charge Transport Across Surface-Modified Current Collectors in Planar SOFCs

Interdiffusion and Charge Transport Across Surface-Modified Current Collectors in Planar SOFCs

Oxidation Behavior and Electrical Conductivity between Ln_0.8Sr_0.2MnO₃ Cathode and Crofer 22 APU with Spinel Coatings

Co₂MnO₄/Ce_0.8Tb_0.2O_2−δ Dual-Phase Membrane Material with High CO₂ Stability and Enhanced Oxygen Transport for Oxycombustion Processes

Contact Info

Product

Resources

About

Protective coatings based on Mn-Co spinel for current collectors of solid oxide fuel cells

Cited by 7 publications

References 5 publications

Interdiffusion and Charge Transport Across Surface-Modified Current Collectors in Planar SOFCs

Interdiffusion and Charge Transport Across Surface-Modified Current Collectors in Planar SOFCs

Oxidation Behavior and Electrical Conductivity between Ln0.8Sr0.2MnO3 Cathode and Crofer 22 APU with Spinel Coatings

Co2MnO4/Ce0.8Tb0.2O2−δ Dual-Phase Membrane Material with High CO2 Stability and Enhanced Oxygen Transport for Oxycombustion Processes

Contact Info

Product

Resources

About

Oxidation Behavior and Electrical Conductivity between Ln_0.8Sr_0.2MnO₃ Cathode and Crofer 22 APU with Spinel Coatings

Co₂MnO₄/Ce_0.8Tb_0.2O_2−δ Dual-Phase Membrane Material with High CO₂ Stability and Enhanced Oxygen Transport for Oxycombustion Processes