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Registration Number

0217U006832, 0117U002798 , R & D reports

Title

The investigation of the effect of excess manganese on properties formation of ceramic manganite (Nd0,67Sr0,33)1-xMn1+xO3 (x = 0; 0,2) to be used as the cathode of solid oxide fuel cells

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Head

Akimov Gennadiiy Yakovych,

Registration Date

12-12-2017

Organization

A.A. Galkin Physics and Engineering Institute of National Academy of Science of the Ukraine

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Objects of the study are composite cathode materials of (Nd0,67Sr0,33) 1-xMn1 + xO3 (x = 0 and 0,2) -10 mol% Sc + 1 mol% CeSZ and (La0,67Sr0,33) 1-xMn1 + xO3 (x = 0 and 0.2) -10 mol% Sc + 1 mole% SeSZ compositions. The subject of the study is the structure, phase composition, electrical conductivity. The goal of the work is the investigation of electrical conductivity and phase stability of cathode material of (Nd0,67Sr0,33) 1-xMn1 + xO3 (x = 0 and 0,2) compositions in comparison with cathodic material for high temperature solid oxide fuel cells of (La0,67Sr0,33) 1-xMn1 + xO3 (x = 0 and 0.2) compositions in contact with a zirconium dioxide electrolyte stabilized with scandium and cerium oxides of 10 mol% Sc + 1 mol% CeSZ. Research methods are scanning electron microscopy, x-ray diffraction for the study of the microstructure and phase composition, the impedance spectroscopy for the study of transport properties, processing and analysis of the results. For the first time, the study of the effect of excess manganese on phase composition, structural parameters, microstructure and density of samples, electrical conductivity at temperatures of 20-200 ° C of composite cathode materials of (Nd0,67Sr0,33) 1-xMn1 + xO3 (x = 0 and 0 , 2) -10 mol% Sc + 1 mole% SeSZ and (La0.67Sr0.33) 1-xMn1 + xO3 (x = 0 and 0.2) -10 mol% Sc + 1 mol% SeSZ compositions after sintering at 1000 °C. According to the results of scanning electron microscopy and x-ray analysis it was found that a sample of composite cathode of the composition of (Nd0,67Sr0,33) 1-xMn1 + xO3 10 mol% Sc + 1 mol% CeSZ with excess manganese (x = 0,2) sintered at 1000 ° C, fully complies with the requirements for cathode material of medium-temperature ceramic fuel cells, namely a porous microstructure formed with necks between the crystallites powders cathode and electrolyte materials, the preservation of phase composition and crystal structure, the absence of other phases. Measurement of electrical conductivity of samples of composite cathodes has shown that the conductivity of samples with excess manganese is significantly higher than the conductivity of samples without excess manganese.

Product Description

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Новохацька Анастасія Олександрівна

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2020-04-02