Protective Coatings La–Mn–Cu–O for Stainless-Steel Interconnector 08Х17Т for SOFC, Obtained by the Electrocrystallization Method from Non-Aqueous Solutions

Ananyev, M.V.; Solodyankin, A. A.; Еремин, В. А.; Фарленков, А. С.; Khodimchuk, Anna V.; Fetisov, Alexander; Черник, А. А.; Yaskelychik, V. V.; Останина, Т. Н.; Zaikov, Yu. P.

doi:10.3103/s1067821218010029

Cited by 12 publications

(3 citation statements)

References 18 publications

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“…The second stage of the thermal treatment was at 1000°C in an air atmosphere. The use of the two‐stage heat treatment decreased the porosity and the electrical resistance as well as increased the corrosion resistance of the protective coatings in comparison with the coatings sintered only in ambient air 63,64 …”

Section: Methodsmentioning

confidence: 99%

Revealing the degradation mechanism of the lanthanum nickelates based double‐layer electrodes during long‐term tests in contact with chromium‐containing steel interconnects

Solodyankin

Еремин

Ananyev

et al. 2022

Intl J of Energy Research

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Summary This paper focuses on the long‐term tests for 1000 hours of different Membrane‐Electrode‐Interconnect Assemblies (MEIAs), consisting of a steel interconnect and an asymmetrical solid electrochemical cell based on the Ce0.8Sm0.2O2−δ electrolyte, the double‐layer working electrode with the La2NiO4+δ – Ce0.8Sm0.2O2−δ composite functional layer and the LaNi0.6Fe0.4O3−δ current collector layer, and the platinum reference electrode (O2, LaNi0.6Fe0.4O3−δ|La2NiO4+δ – Ce0.8Sm0.2O2−δ|Ce0.8Sm0.2O2−δ|Pt, O2). These tests were carried out on MEIAs with two types of Cr‐based stainless steels, Crofer 22 APU and 08X17T, with and without protective coatings at 850°C in air. The electrochemical performance of MEIAs was studied without polarization as well as under cathodic and anodic polarization (current density was 0.5 A cm−2) by means of electrochemical impedance spectroscopy (EIS) and the distribution of relaxation times method (DRT). It was found that the proposed protective coatings for the stainless steels inhibit chromium poisoning without polarization and under anodic polarization: for Crofer 22 APU the degradation of the polarization resistance after ~1100 hours of exposure was 0.35 ± 0.05 Ω cm2, and for 08X17T it was from 0.40 ± 0.05 Ω cm2. In the case of cathodic polarization, the degradation of the polarization resistance remained at a very high level, comparable to uncoated samples: for Crofer 22 APU and 08X17T with coatings, it was about 0.6 to 0.8 Ω cm2 after ~1100 hours. Post‐test analysis of the microstructure and chemical composition of the interconnect ‐ double‐layer electrode interface was carried out using scanning electron microscopy (SEM), wavelength dispersive X‐ray spectrometry (WDS), and respective image analysis of the obtained data. The influence of chromium poisoning on the degradation was considered for different stages of the electrode performance. It was demonstrated that chromium predominantly accumulates in the current collector layer in the case of anodic polarization and in the functional layer in the cases of open circuit and cathodic polarization. For the first time, a combined electrochemical‐chemical degradation mechanism of the La2NiO4+δ – Ce0.8Sm0.2O2−δ functional layer was discussed. Highlights Long‐term tests of Membrane‐Electrode‐Inteconnect Assembles (MEIAs) were done. Chromium poisoning was detected on MEIAs with the interconnects without coating. Cathodic polarization terminates the protective properties of the coatings. Chromium poisoning decreases electrode activity to oxygen exchange and diffusivity. A combined electrochemical‐chemical degradation mechanism of the functional layer was revealed.

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Section: Methodsmentioning

confidence: 99%

Revealing the degradation mechanism of the lanthanum nickelates based double‐layer electrodes during long‐term tests in contact with chromium‐containing steel interconnects

Solodyankin

Еремин

Ananyev

et al. 2022

Intl J of Energy Research

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“…The content of the ceramic component is quite low in comparison to other colloidal methods and usually amounts of 2-10 g/l. ELD are widely used for deposition of protective layers in SOFC as well as deposition of thin electrolyte films and electrodes [63]- [66]. The EPD method is successfully applied to fabricate microtubular SOFCs [65]- [68], fabrication of SOFC electrodes on the supporting dense electrolyte [69], [70] and protective coatings for SOFC interconnects [71], [72].…”

Section: Chemical Solution Deposition and Colloidal Methodsmentioning

confidence: 99%

Place of electrophoretic deposition among thin-film methods adapted to the solid oxide fuel cell technology: A short review

Pikalova¹,

Калинина²

2019

Int. J. EQ

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Thin film technologies have attracted ever-growing interest in different industrial areas. Concerning solid oxide fuel cells (SOFCs), especially devices operating in the intermediate temperature range, such technologies are applied particularly for the deposition of dense, gas-tight electrolyte films with a thickness of several µm to decrease ohmic resistance and enhance the cell performance. The main requirements for the technology selected are its low cost, simplicity of the equipment used, short deposition time and flexibility regarding the cell shape. First, we overview thin-film technologies adapted to the deposition of SOFC functional layers, discussing their strengths and weaknesses, with special attention given to electrophoretic deposition (EPD) as being the most simple and cost-effective colloidal method to fabricate different electrolyte films. Then we present the contribution of our scientific group in the development of the EPD method. The preparation of stable suspensions for the EDP is one of the key requirements for its successful implementation and reproducibility; this was considered in detail and the effect of self-stabilization in suspensions based on nanopowders (7-15 nm), obtained by the method of laser evaporation with consequent condensation, was discussed. Such suspensions, exhibiting high positive ζ-potential values (30-50 mV), were shown to be suitable for EPD without the addition of dispersants or iodine. The requirements for the electrode substrates were formulated and a model of particle aggregation near the porous substrate surface was proposed. Deposition parameters were established for different electrolyte films -commonly used yttria-stabilized zirconia, single and multiply doped CeO 2 and proton-conducting doped BaCeO 3 electrolytes. As was shown, the deposition on the highly conducting cathode substrates is simpler to implement than the EPD on non-conducting anode substrates and, in addition, it produces high quality films which render high OCV values and superior SOFC performance.

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“…The samples' surface modification was performed with the original method. Previously, we presented a method for forming a protective coating on the 08H17T stainless steel, which is analog of the well-known steel Crofer 22APU [19]. We were also granted a patent for a method of applying an electroconductive oxide protective coating of the interconnector to various chromium-containing steels [20].…”

Section: Methodsmentioning

confidence: 99%

Formation of Conductive Oxide Scale on 33NK and 47ND Interconnector Alloys for Solid Oxide Fuel Cells

et al. 2019

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: Two grades of chromium-free alloys were studied in order to apply them as interconnectors for solid oxide fuel cells. The surface modification methods were proposed for each alloy with the purpose of forming of oxide scales considering the required physicochemical properties. Investigations of the structure and properties of the obtained oxide scales were performed and the efficiency of the chosen surface modification methods was approved. The samples with the surface modification exhibited higher conductivity values in comparison with the nonmodified samples. A compatibility study of samples with surface modification and glass sealant of chosen composition was accomplished. The modified samples demonstrated good adhesion during testing and electrical resistance less than 40 mOhm/cm2 at 850 °C in air, which allowed us to recommend these alloys with respective modified oxide scales as interconnectors for SOFC.

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Protective Coatings La–Mn–Cu–O for Stainless-Steel Interconnector 08Х17Т for SOFC, Obtained by the Electrocrystallization Method from Non-Aqueous Solutions

Cited by 12 publications

References 18 publications

Revealing the degradation mechanism of the lanthanum nickelates based double‐layer electrodes during long‐term tests in contact with chromium‐containing steel interconnects

Revealing the degradation mechanism of the lanthanum nickelates based double‐layer electrodes during long‐term tests in contact with chromium‐containing steel interconnects

Place of electrophoretic deposition among thin-film methods adapted to the solid oxide fuel cell technology: A short review

Formation of Conductive Oxide Scale on 33NK and 47ND Interconnector Alloys for Solid Oxide Fuel Cells

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