Optimum design for the sensing electrode mixtures of PbSnF4-based oxygen sensors for fast response at ambient temperature

被引:19
作者
Eguchi, T [1 ]
Suda, S [1 ]
Amasaki, H [1 ]
Kuwano, J [1 ]
Saito, Y [1 ]
机构
[1] Sci Univ Tokyo, Fac Engn, Dept Ind Chem, Shinjuku Ku, Tokyo 1628601, Japan
关键词
oxygen gas sensor; fluoride ion conductor; whisker; ambient temperature; response time;
D O I
10.1016/S0167-2738(99)00042-9
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
The amperometric oxygen sensors of the type, Ag\Ag6I4WO4\PbSnF4\ sensing electrode (a mixture of iron(II) phthalocyanine (FePc), PbSnF4 and a whisker material) have been fabricated and effects of the incorporated whiskers on response properties have been examined to design the optimum sensing electrode mixture. The selected whiskers were several 9Al(2)O(3) . 2B(2)O(3) and TiO2 whiskers different in length and conductivity (with or without conductive SnO2 coating film). Fast response comparable to that of galvanic-cell-type sensors was realized with the sensing electrode mixture designed on the basis of the following two points: (1) the sensing electrode should be a ternary mixture of whiskers, FePc and PbSnF4 with a volume ratio of 1:7:2; (2) the whiskers should have a length around 20 mu m, an aspect ratio of about 20 and a good electronic conductivity. The mean response time, 25 s, was to date the shortest of those of known solid-state electrochemical sensors at room temperature. The incorporation also greatly improved other response properties such as transient behavior, drifts and hysteresis. The roles of the incorporated conductive whiskers are to form the conductive whisker networks in the sensing electrode mixture and to make the reduction sites of oxygen molecules electrochemically uniform by localizing the sites along the networks. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:235 / 243
页数:9
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