Praseodymium-cerium oxide as a surface-effect gas sensor

被引：4

作者：

Stefanik, TS ^{[1
]}

Tuller, HL ^{[1
]}

机构：

[1] MIT, Dept Mat Sci & Engn, Crystal Phys & Electroceram Lab, Cambridge, MA 02139 USA

来源：

JOURNAL OF ELECTROCERAMICS | 2004年 / 13卷 / 1-3期

关键词：

selectivity; sensitivity; CO sensing;

D O I：

10.1007/s10832-004-5190-z

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The gas sensing behavior of praseodymium doped cerium oxide (PrxCe1-xO2 or PCO) has been examined for 0-1000 ppm CO or H-2 in a 10% O-2 atmosphere at temperatures ranging from 250-350degreesC. Total conductivity as a function of temperature suggests that oxygen diffusion kinetics are slow below approximately 350degreesC. Devices with x = 0.05 and 0.10 show stable, n-type gas sensing response, while those with x = 0.20 exhibit significant drift in sensor output, presumably due to bulk oxygen migration. The response to CO is significantly stronger than that to H-2 at 300degreesC, and at 350degreesC the response to H-2 is nearly zero, resulting in a CO-selective gas sensing element. Suggestions for the source of selectivity in PCO are presented.

引用

页码：771 / 774

页数：4

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