TY - JOUR
T1 - Proton-conducting Ba1-xKxCe0.6Zr 0.2Y0.2O3-δ oxides synthesized by sol-gel combined with composition-exchange method
AU - Lee, Kan Rong
AU - Chiang, Yen Chun
AU - Hung, I. Ming
AU - Tseng, Chung Jen
AU - Chang, Jeng Kuei
AU - Lee, Sheng Wei
N1 - Funding Information:
The research is supported by National Nano-Device Laboratories and National Science Council of Taiwan under Contract nos. NSC 101-3113-P-008-006 and NSC 100-2221-E-008-016-MY3 respectively. The authors also thank National Nano-Device Laboratories and Center for Nano-Science and Technology at National Central University for the facility support.
PY - 2014/1
Y1 - 2014/1
N2 - This study reports the synthesis of proton-conducting Ba 1-xKxCe0.6Zr0.2Y0.2O 3-δ (x=0.025-0.075) ceramics by using a combination of citrate-EDTA complexing sol-gel process and the composition-exchange method. Compared to the sintered oxides of similar composition prepared from conventional sol-gel powders, Ba1-xKxCe 0.6Zr0.2Y0.2O3-δ oxides synthesized by sol-gel combined with the composition-exchange method are found to exhibit improved sinterability, higher conductivity, more homogeneous phase, and excellent chemical stability against CO2. Among all sintered oxides in this study, the Ba0.925K0.075Ce 0.6Zr0.2Y0.2O3-δ pellet fabricated by this new method has the highest conductivity, 0.0094 S/cm at 800 C, which is higher than those pressed from conventional sol-gel powders in the K doping range of 0-15%. Based on the experimental results, we discuss the mechanism for improvement in these properties in terms of calcined particle characteristics. This work demonstrates that Ba1-xK xCe0.6Zr0.2Y0.2O 3-δ oxides synthesized by sol-gel combined with the composition-exchange method would be a promising electrolyte for H +-SOFC applications. More importantly, this new fabrication approach may be applied to other similar material systems, such as Sr-doped Ba(Ce,Zr)O3 ceramics.
AB - This study reports the synthesis of proton-conducting Ba 1-xKxCe0.6Zr0.2Y0.2O 3-δ (x=0.025-0.075) ceramics by using a combination of citrate-EDTA complexing sol-gel process and the composition-exchange method. Compared to the sintered oxides of similar composition prepared from conventional sol-gel powders, Ba1-xKxCe 0.6Zr0.2Y0.2O3-δ oxides synthesized by sol-gel combined with the composition-exchange method are found to exhibit improved sinterability, higher conductivity, more homogeneous phase, and excellent chemical stability against CO2. Among all sintered oxides in this study, the Ba0.925K0.075Ce 0.6Zr0.2Y0.2O3-δ pellet fabricated by this new method has the highest conductivity, 0.0094 S/cm at 800 C, which is higher than those pressed from conventional sol-gel powders in the K doping range of 0-15%. Based on the experimental results, we discuss the mechanism for improvement in these properties in terms of calcined particle characteristics. This work demonstrates that Ba1-xK xCe0.6Zr0.2Y0.2O 3-δ oxides synthesized by sol-gel combined with the composition-exchange method would be a promising electrolyte for H +-SOFC applications. More importantly, this new fabrication approach may be applied to other similar material systems, such as Sr-doped Ba(Ce,Zr)O3 ceramics.
KW - C. Ionic conductivity
KW - Chemical stability
KW - Proton-conducting electrolyte
KW - Solid oxide fuel cells
UR - http://www.scopus.com/inward/record.url?scp=84887994949&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2013.07.089
DO - 10.1016/j.ceramint.2013.07.089
M3 - 期刊論文
AN - SCOPUS:84887994949
SN - 0272-8842
VL - 40
SP - 1865
EP - 1872
JO - Ceramics International
JF - Ceramics International
IS - 1 PART B
ER -