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Abstract
Potassium doped barium zirconates have been synthesized by solid state reactions. It was found that the solubility limit of potassium on A-sites is between 5% and 10%. Introducing extra potassium leads to the formation of second phase or YSZ impurities. The water uptake of barium zirconates was increased even with 5% doping of potassium at the A-site. The sintering conditions and conductivity can be improved significantly by adding 1 wt% ZnO during material synthesis. The maximum solubility for yttrium at B-sites is around 15 at% after introducing 1 wt% zinc. The conductivity of Ba0.95K0.05Zr0.85 Y0.11Zn0.04O3-delta at 600 degrees C is 2.2 x 10(-3) S/cm in wet 5% H-2. The activation energies for bulk and grain boundary are 0.29(2), 0.79(2)eV in wet 5% H-2 and 0.31(1), 0.74(3)eV in dry 5% H-2. A power density of 7.7 mW/cm(2) at 718 degrees C was observed when a 1 mm thick Ba0.95K0.05Zr0.85Y0.11Zn0.04O3-delta pellet was used as electrolyte and platinum electrodes. (C) 2009 Elsevier Inc. All rights reserved.
Original language | English |
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Pages (from-to) | 93-98 |
Number of pages | 6 |
Journal | Journal of Solid State Chemistry |
Volume | 183 |
Issue number | 1 |
Early online date | 31 Oct 2009 |
DOIs | |
Publication status | Published - Jan 2010 |
Keywords
- BaZrO3
- Proton conductivity
- Potassium
- Impedance measurement
- Fuel cell
- FUEL-CELLS
- ELECTROLYTE
- STABILITY
- OXIDES
- CONDUCTORS
- BACEO3
- CAZRO3
- YB
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Dive into the research topics of 'Proton conductivity of potassium doped barium zirconates'. Together they form a unique fingerprint.Projects
- 1 Finished
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Material for high Temp FCT EP/E064248/1: Materials for High Temperature Fuel Cell Technology
Irvine, J. T. S. (PI), Cassidy, M. (CoI), Connor, P. A. (CoI), Savaniu, C. D. (CoI) & Tao, S. (CoI)
1/01/08 → 31/12/12
Project: Standard