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Structural study and proton conductivity in BaCe0.7Zr0.25-xYxZn0.05O3 (x=0.05, 0.1, 0.15, 0.2 & 0.25)

A. Afif ; N. Radenahmad ; C. M. Lim ; M. I. Petra ; M. A. Islam ; Seikh Rahman (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Sten G. Eriksson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; A. K. Azad
International Journal of Hydrogen Energy (0360-3199). Vol. 41 (2016), 27, p. 11823-11831.
[Artikel, refereegranskad vetenskaplig]

Solid oxide fuel cell (SOPC) has been considered to generate power represented by conductivity. Zinc doped Barium Cerium Zirconium Yttrium oxide (BCZYZn) has been found to offer high protonic conductivity and high stability as being electrolyte for proton conducting SOFCs. In this study, we report a new series of proton conducting materials, BaCe0.7Zr0.25-xYxZn0.05O3 (x = 0.05, 0.1, 0.15, 0.2 and 0.25). The materials were synthesized by solid state reaction route and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal expansion, particle size and impedance spectroscopy (IS). Rietveld analysis of the XRD data reveal a cubic perovskite structure with Pm-3m space group up to composition x = 0.15. For x = 0.15 and 0.20, the materials have structural phase change to orthorhombic in the Pbnm space group. Scanning electron microscopy images show high density materials. Thermal expansion measurements show that the thermal expansion coefficient is in the range 10.0-11.0 x 10(-6)/degrees C. Impedance spectroscopy shows higher ionic conduction under wet condition compared to dry condition. Y content of 25% (BCZYZn25) exhibits highest conductivity of 1.84 x 10(-2) S/cm in wet Argon. This study indicated that perovskite electrolyte BCZYZn is promising material for the next generation of intermediate temperature solid oxide fuel cells (IT-SOFCs).

Nyckelord: Proton conductor, Sinterability, Rietveld refinement, Conductivity, SOFC electrolyte



Denna post skapades 2016-09-16.
CPL Pubid: 241896

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Oorganisk miljökemi

Ämnesområden

Oorganisk kemi

Chalmers infrastruktur