Effect of yttria-stabilized zirconia sintering temperature on mixed potential sensor performance

被引：31

作者：

Sekhar, Praveen K. ^{[1
]}

Brosha, Eric L. ^{[1
]}

Mukundan, Rangachary ^{[1
]}

Nelson, Mark A. ^{[1
]}

Toracco, Dennis ^{[1
]}

Garzon, Fernando H. ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Sensors & Electrochem Devices Grp, Los Alamos, NM 87545 USA

来源：

SOLID STATE IONICS | 2010年 / 181卷 / 19-20期

关键词：

YSZ; Sintering; Mixed potential; Sensor; Tortuosity; OXIDE ELECTRODES; GAS SENSORS; NOX SENSORS; ELECTROCHEMICAL SENSORS; SENSING PERFORMANCES; ELECTROLYTES;

D O I：

10.1016/j.ssi.2010.05.029

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this article, the influence of yttria-stabilized zirconia (YSZ) sintering temperature on a Pt/YSZ/La(0.8)Sr(0.2)CrO(3) mixed potential sensor performance is reported. The sintering temperature of YSZ was varied from 1000 to 1200 degrees C. Mercury porosity measurements were performed to estimate the porosity and tortuosity of the YSZ sample as a function of sintering temperature. Further, the surface area of YSZ was computed by the BET method. After YSZ characterization, the unbiased and biased sensor response was recorded. The 1000 degrees C sintered YSZ sample was taken as the reference for comparison purposes. Experimental results indicated a 30% reduction in porosity for the 1200 degrees C sintered YSZ sample, resulting in a 14-fold increase in the sensor response rise time. In addition, for the same sample, a 13-fold increase in sensitivity was observed upon exposure to propylene (100 ppm), associated with a 76% reduction in surface area. The slow response time of the sensor with YSZ sintered at higher temperatures has been attributed to higher tortuosity (delay in gas permeation to the three-phase interface). Whereas, reduced heterogeneous catalysis induced by lower surface area accounts for the rise in sensitivity levels. The optimum YSZ sintering temperature was found to lie between 1100 and 1150 degrees C. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：947 / 953

页数：7

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