Influence of synthesis route on electrical and electrochemical properties of Nd sub(1.8)Sr sub(0.2)NiO sub(4+ delta )

The Nd sub(1.8)Sr sub(0.2)NiO sub(4+ delta ) was prepared by sol-gel, microwave combustion and solid-state reaction. The highest dc conductivity ([sigma] = 61 S cm super(-1) at 660 [degrees]C) for sol-gel derived Nd sub(1.8)Sr sub(0.2)NiO sub(4+ delta ) compared to those prepared by microwave combus...

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Bibliographic Details
Published in:Solid state ionics 2014-09, Vol.262, p.701-706
Main Authors: Punde, J D, Khandale, A P, Bhoga, S S
Format: Article
Language:English
Subjects:
Cathodes
Combustion
Electrochemical analysis
Electrolytes
Microwaves
Resistivity
Sol gel process
Synthesis
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Summary:The Nd sub(1.8)Sr sub(0.2)NiO sub(4+ delta ) was prepared by sol-gel, microwave combustion and solid-state reaction. The highest dc conductivity ([sigma] = 61 S cm super(-1) at 660 [degrees]C) for sol-gel derived Nd sub(1.8)Sr sub(0.2)NiO sub(4+ delta ) compared to those prepared by microwave combustion and solid-state reaction was due to lowest ciystallite size (165.92 run) and high sintered density (90%). Symmetric cells configured as cathode/electrolyte/cathode were fabricated by spin coating the cathode ink on gadolinium doped ceria (GDC) electrolyte. The lowest area specific resistance (ASR) value of 0.6 [Omega] cm super(2) was obtained at 700 [degrees]C for sol-gel derived Nd sub(1.8)Sr sub(0.2)NiO sub(4+ delta ). Particle size distribution of Nd sub(1.8)Sr sub(0.2)NiO sub(4+ delta ) cathode was largely dependent on the synthesis route, and that influenced the ASR. Electrochemical performance suggests absorption of oxygen by Nd sub(1.8)Sr sub(0.2)NiO sub(4+ delta ) lattice is the rate-limiting step.
ISSN:0167-2738
DOI:10.1016/j.ssi.2014.01.021