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Preparation of K2OSm2O3nSiO2-based solid-state electrolyte and its application to electrochemical CO2 gas sensor

✍ Scribed by Yoshihiko Sadaoka; Susumu Nakayama; Yoshiro Sakai; Makoto Wake

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
602 KB
Volume
24
Category
Article
ISSN
0925-4005

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✦ Synopsis

Ceramic-glass composites (&O-SmzOs-GO?) may be produced directly by the sintering of starting mixtures. The ionic conductivity is lowered with an increase in SiO, content for the sample with hexagonal structure. The CO,-sensing characteristics of an electrochemical gas sensor with a structure expressed as Pt~~K~O-Sm203~Si0,)Na,C0,(IPt, CO, have been investigated in terms of a two-electron electrochemical reaction. The e.m.f. is sensitive to the CO, gas concentration and increases with n in KIOSm,O,-nSiO,.

The introduction of water vapour induces a lowering of the e.m.f. in which the decrement increased with a decrease in CO, concentration, and a prolongation of the response time. The sensing characteristics recover completely after the water vapour is cut off.

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