Enhanced proton conduction of BaZr sub(0.9)Y sub(0.1)O sub(3 - delta ) by hybrid doping of ZnO and Na sub(3)PO sub(4)

• Published in: Solid state ionics Vol. 281; pp. 6 - 11
• Main Authors: Ma, Guoqiang, Wen, Zhaoyin, Han, Jinduo, Zhang, Jingchao, Wen, Yabing
• Format: Journal Article
• Language: English
• Published: 01.11.2015
• Subjects: Atmospheres; Ceramics; Conductivity; Doping; Electrical properties; Resistivity; Sintering; Zinc oxide
• ISSN: 0167-2738
• DOI: 10.1016/j.ssi.2015.08.009

Hybrid doping of ZnO and Na sub(3)PO sub(4) are employed to improve the sintering ability and the proton conductivity of BaZr sub(0.9)Y sub(0.1)O sub(3- delta ). Ceramic is obtained by sintering at 1260 degree C, the lowest sintering temperature for BaZrO sub(3)-based electrolyte. It is demonstrated that a second amorphous phase is uniformly dispersed around the grain boundary of BaZr sub(0.9)Y sub(0.1)O sub(3- delta ). The electrical properties of the composite under 3% wet H sub(2), 3% wet N sub(2), and dry N sub(2) atmospheres are investigated from 400 degree C to 750 degree C by AC impedance spectroscopy. The results show that the conductivity of the BaZr sub(0.9)Y sub(0.1)O sub(3 - delta )/ZnO/Na sub(3)PO sub(4) ceramic is improved by more than one order of magnitude over the BaZr sub(0.9)Y sub(0.1)O sub(3- delta )/ZnO ceramic under wet H sub(2) atmosphere.