Proton conduction in oxygen deficient Ba3In1.4Y0.3M0.3ZrO8 (M = Ga3+ or Gd3+) perovskites
Journal article, 2014

B-site disordered, oxygen deficient Ba3In1.4Y0.3M0.3ZrO8 (M = Gd3+ or Ga3+) perovskites of space group Pm (3) over barm, were prepared by a solid-state reactive sintering method. Thermogravimetric analysis of the as-prepared samples revealed 79.3% and 55.5% protonation of the available oxygen vacancies by OH groups in the Gd-3: and Ga-3: containing samples, respectively. Conductivity was found to be in the range of 0.3-1.1 x 10 (3) S cm (1) (M = Gd3+) and 1.1-4.6 x 10 (4) S cm (1) (M = Ga3+) for the temperature interval 300-600 degrees C in wet Argon. Ba3In1.4Y0.3Ga0.3ZrO8 shows an approximate one order of magnitude increase in conductivity at T > 600 degrees C under dry oxygen indicating a significant p-type contribution whereas Ba3In1.4Y0.3Gd0.3ZrO8 reveals a smaller enhancement. Ba3In1.4Y0.3Ga0.3ZrO8 displays considerable mixed proton-electronic conduction in the interval 400-800 degrees C under wet oxidising conditions suggesting possibility of Ga-containing compositions as a cathode materials in a proton conducting fuel cell.

Proton conducting electrolyte

Oxygen deficient perovskite

Cathode material

Mixed conductor

Author

FRANCIS GACHAO KINYANJUI

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Stefan Norberg

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Christopher Knee

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Sten Eriksson

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Journal of Alloys and Compounds

0925-8388 (ISSN)

Vol. 605 56-62

Subject Categories

Inorganic Chemistry

DOI

10.1016/j.jallcom.2014.03.142

More information

Created

10/7/2017