Highly dense and chemically stable proton conducting electrolyte sintered at 1200 °C
Journal article, 2018

The BaCe 0.7 Zr 0.1 Y 0.2−x Zn x O 3−δ (x = 0.05, 0.10, 0.15, 0.20) has been synthesized by the conventional solid state reaction method for application in protonic solid oxide fuel cell. The phase purity and lattice parameters of the materials have been studied by the room temperature X-ray diffraction (XRD). Scanning electron microscopy (SEM) has been done for check the morphology and grain growth of the samples. The chemical and mechanical stabilities have been done using thermogravimetric analysis (TGA) in pure CO 2 environment and thermomechanical analysis (TMA) in Argon atmosphere. The XRD of the materials show the orthorhombic crystal symmetry with Pbnm space group. The SEM images of the pellets show that the samples sintered at 1200 °C are highly dense. The XRD after TGA in CO 2 and thermal expansion measurements confirm the stability. The particles of the samples are in micrometer ranges and increasing Zn content decreases the size. The conductivity measurements have been done in 5% H 2 with Ar in dry and wet atmospheres. All the materials show high proton conductivity in the intermediate temperature range (400–700 °C). The maximum proton conductivity was found to be 1.0 × 10 −2 S cm −1 at 700 °C in wet atmosphere for x = 0.10. From our study, 10 wt % of Zn seems to be optimum at the B-site of the perovskite structure. All the properties studied here suggest it can be a promising candidate of electrolyte for IT-SOFCs.

Rietveld refinement

Electrolyte

Impedance analysis

Proton conductor

Chemical stability

Perovskite

Author

S. Hossain

Universiti Brunei Darussalam

Bangladesh Atomic Energy Commission

University of St Andrews

Abdalla M. Abdalla

University of St Andrews

Universiti Brunei Darussalam

Suez Canal University

N. Radenahmad

Universiti Brunei Darussalam

A. K. M. Zakaria

Bangladesh Atomic Energy Commission

Juliana H. Zaini

Universiti Brunei Darussalam

Habibur Seikh Mohammad Rahman

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry

Sten Eriksson

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Environmental Inorganic Chemistry

J. T. S. Irvine

University of St Andrews

A. K. Azad

Universiti Brunei Darussalam

International Journal of Hydrogen Energy

0360-3199 (ISSN)

Vol. 43 2 894-907

Subject Categories

Inorganic Chemistry

Ceramics

Materials Chemistry

DOI

10.1016/j.ijhydene.2017.11.111

More information

Latest update

10/15/2019