An investigation of the electrical properties and microstructure of Ni/Ce0.8Gd0.2O2, composite-based anode for a solid oxide fuel cell fabricated by 3D printing

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Abstract

In this work, a series of planar anode billes for a solid oxide fuel cell based on NiO/Ce0.8Gd0.2O2 (NiO/GDC) was fabricated using the microdroplet 3D printing method with a pneumatic metering valve. The porosity and shrinkage coefficient during sintering of the anode billes, depending on the method of fabrication, have been investigated.

Anode billes were reduced in a hydrogen flow, and the effect of printing parameters on the morphological, structural, and electrochemical characteristics of NiO/Ce0.8Gd0.2O2 cermet was studied. The use of 3D printing was found to increase the porosity of the Ni/GDC composite from 7 to 23% as compared to that of the sample prepared by means of casting, while the value of electrical conductivity, (2.82 ± 0.06)·103 S/cm, remains high.

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About the authors

A. D. Asmedianova

Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences; Novosibirsk State University

Author for correspondence.
Email: asmedianova@gmail.com
Russian Federation, Novosibirsk; Novosibirsk

A. I. Titkov

Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences

Email: asmedianova@gmail.com
Russian Federation, Novosibirsk

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2. Fig. 1. Microphotographs of a NiO/GDC composite anode workpiece obtained by casting (a), 3D printing (b).

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3. Fig. 2. X-ray diffraction patterns of a 3D-printed sample after sintering at 1400 oC (bottom) and after subsequent recovery at 600 oC (top).

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4. Fig. 3. Microphotographs of Ni/GDC composite anodes after reduction, obtained: (a) and (c) by casting, (b) and (d) 3D printing, at two magnifications.

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