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High performance and stability of double perovskite-type oxide NdBa0.5Ca0.5Co1.5Fe0.5O5+δas an oxygen electrode for reversible solid oxide electrochemical cell

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Journal of Energy Chemistry 2020年第4期29卷 108-115页

作者： Yunfeng Tian Yun Liu Wenjie Wang Lichao Jia Jian Pu Bo Chi Jian Li Center for Fuel Cell Innovation State Key Laboratory of Material Processing and Die&Mould TechnologySchool of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina China-EU Institute for Clean and Renewable Energy Huazhong University of Science and TechnologyWuhan 430074HubeiChina

In this study,we successfully synthesized double perovskite-type oxide NdBa0.5Ca0.5Co1.5Fe0.5O5+δ(NBCCF)using a conventional wet chemical method as the oxygen electrode for reversible solid oxide electrochemical cells(RSOCs).The polarization resistance(Rp)of the composite electrode NBCCFGd0.1Ce0.9O2(GDC)is only 0.079Ωcm^2 at 800℃under *** single cell based on NBCCF-GDC electrode displays a peak power density of 0.941 W/cm^2 in fuel cell mode and a low Rp value of 0.134Ωcm^*** electrolysis cell mode,the cell displays an outstanding oxygen evolution reaction(OER)activity and shows current density as high as 0.92 A/cm^2 with 50 vol%AH(Absolute Humidity)at 800℃and applied voltage of 1.3 *** importantly,the cell exhibits admirable durability of 60 h both in electrolysis mode and fuel cell mode with distinguished *** these results suggest that NBCCF is a promising candidate electrode for RSOC.

关键词： Reversible solid oxide electrochemical cell Double perovsldte Composite electrode Stability Reversibility

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Evaluation of La AlO_3 as top coat material for thermal barrier coatings

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Transactions of Nonferrous Metals Society of China 2018年第8期28卷 1582-1592页

作者： N.VOURDAS E.MARATHONITI P.K.PANDIS Chr.ARGIRUSIS G.SOURKOUNI C.LEGROS S.MIRZA V.N.STATHOPOULOS Laboratory of Chemistry and Materials Technology School of technological ApplicationsTechnological Educational Institute of Sterea Ellada 34400 Psachna Campus Evia Greece School of Chemical Engineering national Technical University of Athens I. Polytectmeiou 9 15780 Zografou Athens Greece Inst. f. Metallurgie Technische Universitat Clausthal Robert-Koch-Str. 42 38678 Clausthal-Zellerfeld Germany Institut de Chimie Moleculaire et des Materiaux d'Orsay université Paris Sud Bt 410 91405 Orsay Cedex France ELEMENT S.A. Hitchin SG4 0TW UK

Perovskite is a versatile group of oxide materials allowing their properties to be tailored by composition towards specific requirements. La Al O3 was prepared to study and report its properties in the context of its potential in thermal barrier coatings（TBCs） technology. A citric acid method was used for synthesis and the perovskite structure was confirmed using XRD and FT-IR. Viscosity of the solution precursor was checked as well as the particle size by laser particle size analysis. Densification behavior of the material was followed by conventional sintering and by spark plasma sintering. Apparent porosity by the Archimedes method, thermal conductivity and thermal expansion coefficient were studied. Mechanical and fracture properties were measured at elevated temperatures up to 1300 ℃ For samples sintered at 1200-1400 ℃, coefficient of thermal expansion ranged from 5.5×10^-6 to 6.5×10^-6 K^-1 and thermal conductivity ranged between 2.2 and 3.4 W/（m？K）. Elastic modulus and ultimate stress were measured at 1000-1300 ℃, while by micro-indentation, fracture toughness was found to be 3 MPa·m1/2. As the sintering temperature increased from 1200 to 1500 ℃, significant densification from 3.21 to 5.81 g/cm^3 was found, indicating that material annealing should be made at least at 1400 ℃. Under this condition, negligible dimensional change in phase transition temperature of La Al O3 from the rhombohedral（R3 c） to the ideal cubic（Pm3 m） is found. Data reported in this work can be useful for comparing the mechanical and fracture behaviours of different TBCs developed involving La Al O3 as well as input for numerical simulations.

关键词： perovsldte lanthanum aluminate thermal barrier coating (TBC)

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