Structural study and proton conductivity in BaCe0.7Zr0.25-xYxZn0.05O3 (x=0.05, 0.1, 0.15, 0.2 & 0.25)
Artikel i vetenskaplig tidskrift, 2016

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).

SOFC electrolyte

Sinterability

Proton conductor

Rietveld refinement

Conductivity

Författare

A. Afif

Universiti Brunei Darussalam

N. Radenahmad

Universiti Brunei Darussalam

C. M. Lim

Universiti Brunei Darussalam

P. I. Petra

Universiti Brunei Darussalam

M. A. Islam

Universiti Brunei Darussalam

Seikh Mohammad Habibur Rahman

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Sten Eriksson

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

A. K. Azad

Universiti Brunei Darussalam

International Journal of Hydrogen Energy

0360-3199 (ISSN)

Vol. 41 27 11823-11831

Ämneskategorier

Oorganisk kemi

DOI

10.1016/j.ijhydene.2016.02.135

Mer information

Skapat

2017-10-08