Highly dense and chemically stable proton conducting electrolyte sintered at 1200 °C
Artikel i vetenskaplig tidskrift, 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.

Impedance analysis

Rietveld refinement

Chemical stability

Perovskite

Electrolyte

Proton conductor

Författare

S. Hossain

Bangladesh Atomic Energy Commission

Universiti Brunei Darussalam

University of St Andrews

Abdalla M. Abdalla

Universiti Brunei Darussalam

University of St Andrews

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, Kemi och kemiteknik, Energi och material

Sten Eriksson

Chalmers, Kemi och kemiteknik, Energi och material

J. T. S. Irvine

University of St Andrews

A. K. Azad

Universiti Brunei Darussalam

International Journal of Hydrogen Energy

0360-3199 (ISSN)

Vol. 43 894-907

Ämneskategorier

Oorganisk kemi

Keramteknik

Materialkemi

DOI

10.1016/j.ijhydene.2017.11.111