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Properties of Ceria Based Novel Anode Nanopowders Synthesized by Glycine-Nitrate Process

100%

Yıldız Ö., Soydan A., Ata A., Tunaboylu B., Akın D., İpcizade E.

Acta Physica Polonica A

2013

vol. 123

issue 2

432-435

Novel anode nanopowder materials consisting of ceria-based components synthesized by glycine-nitrate process were investigated for solid oxide fuel cells. Glycine-nitrate process involves a self-combustion reaction at 220C of water-based nitrate and glycine solutions which subsequently can reach up to 1200°C. The resulting morphology, the size of particles and the formation of crystalline phases were characterized by differential scanning calorimetry, X-ray diffraction, transmission electron microscopy, scanning electron microscopy, the Brunauer-Emmett-Teller method and Nanosizer. It was determined that dopants in ceria such as Co, Ni, Cu, V and Fe had significant effect on the morphology and size. The size distribution measured by Nanosizer was 50-600 nm, transmission electron microscopy, 5-200 nm and the Brunauer-Emmett-Teller method 100-120 nm and specific surface area of powders in the range 67.45-72.05 m^2 g^{-1} as measured by the Brunauer-Emmett-Teller method. Particles were observed to have spherical structures for Cu and Fe doped powders and rod-shaped in a porous tuff microstructure for those doped with Co and Ni. Vanadium doping helped to decrease the porosity and initiated the process of spheroidization of particles.

Structural Analysis of Ce Doped La_{1-x}Sr_xCo_{1-y}Fe_yO_{3-δ} Nanopowders Synthesized by Glycine-Nitrate Gel Combustion

100%

Yildiz Ö., Soydan A., Ata A., İpçızade E., Akin D., Uçak Ö.

Acta Physica Polonica A

2014

vol. 125

issue 2

669-672

Ce doped La_{1-x}Sr_xCo_{1-y}Fe_yO_3 (LCSCF) is a widely used cathode material due to its high catalytic activity for oxygen reduction and high oxygen exchange coefficient. LCSCF is also known with its high ionic and electronic conductivities and low electrode polarization losses which are highly critical properties for low temperature solid oxide fuel cell applications. In this study, structural properties of the LCSCF cathode nanopowder materials synthesized by glycine-nitrate gel combustion have been investigated by X-ray diffraction, differential scanning calorimetry, scanning electron microscopy, and nanosizer. Synthesized nanopowders represent volcanic ash like structures and morphologies. Ce, Sr, Co, and Fe are found to have significant effects on the structural properties of powders in terms of powders morphology, agglomerate structure, crystallite size and also lattice parameter of perovskite crystal. All synthesized ash powders have particle sizes around 50-600 nm, varying crystalline structures of perovskite and fluorite depending on molar ratio of Ce in the composition. Increasing molar Ce ratio over 0.4 is found to lead to the formation of a separate nano ceria phase in fluorite crystal structure on the surface of the synthesized powder.

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2 Acta Physica Polonica A

1 2014

1 2013

2 Ata A.

2 Soydan A.

1 Akin D.

1 Akın D.

1 Tunaboylu B.

1 Uçak Ö.

1 Yildiz Ö.

1 Yıldız Ö.

1 İpcizade E.

1 İpçızade E.

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Properties of Ceria Based Novel Anode Nanopowders Synthesized by Glycine-Nitrate Process

Structural Analysis of Ce Doped La_{1-x}Sr_xCo_{1-y}Fe_yO_{3-δ} Nanopowders Synthesized by Glycine-Nitrate Gel Combustion