Tailoring Ni and Sr 2 Mg 0.25 Ni 0.75 MoO 6−δ Cermet Compositions for Designing the Fuel Electrodes of Solid Oxide Electrochemical Cells

Lubov S. Skutina, Aleksey A. Vylkov, Dmitry K. Kuznetsov, Dmitry A. Medvedev and Vladimir Ya. Shur
Additional contact information
Lubov S. Skutina: Laboratory of Electrochemical Devices Based on Solid Oxide Proton Electrolytes, Institute of High Temperature Electrochemistry, 620137 Yekaterinburg, Russia
Aleksey A. Vylkov: Laboratory of Electrochemical Devices Based on Solid Oxide Proton Electrolytes, Institute of High Temperature Electrochemistry, 620137 Yekaterinburg, Russia
Dmitry K. Kuznetsov: Ural Federal University, 620002 Yekaterinburg, Russia
Dmitry A. Medvedev: Laboratory of Electrochemical Devices Based on Solid Oxide Proton Electrolytes, Institute of High Temperature Electrochemistry, 620137 Yekaterinburg, Russia
Vladimir Ya. Shur: Ural Federal University, 620002 Yekaterinburg, Russia

Energies, 2019, vol. 12, issue 12, 1-11

Abstract: The design of new electrode materials for solid oxide electrochemical cells, which are stable against redox processes as well as exhibiting carbon/sulphur tolerance and high electronic conductivity, is a matter of considerable current interest as a means of overcoming the disadvantages of traditional Ni-containing cermets. In the present work, composite materials having the general formula (1−x)Sr 2 Mg 0.25 Ni 0.75 MoO 6−δ + xNiO (where x = 0, 15, 30, 50, 70 and 85 mol.%) were successfully prepared to be utilised in solid oxide fuel cells. A detailed investigation of the thermal, electrical, and microstructural properties of these composites, along with their phase stability in oxidising and reducing atmospheres, was carried out. While possessing low thermal expansion coefficient (TEC) values, the composites having low Ni content (15 mol.%–70 mol.%) did not satisfy the requirement of high electronic conductivity. Conversely, the 15Sr 2 Mg 0.25 Ni 0.75 MoO 6−δ + 85NiO samples demonstrated very high electrical conductivity (489 S sm −1 at 850 °C in wet H 2 ) due to well-developed Ni-based networks, and no deterioration of thermal properties (TEC values of 15.4 × 10 −6 K −1 in air and 14.5 × 10 −6 K −1 in 50%H 2 /Ar; linear expansion behaviour in both atmospheres). Therefore, this material has potential for use as a component of a fuel cell electrode system.

Keywords: SOFCs; fuel electrodes; double perovskite; thermal expansion; composite materials (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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