Electrochemical Composite Carbon-Ceramic Gas Sensors: Introduction and Oxygen Sensing

Michael Tsionsky, Ovadia Lev

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

A new class of sol-gel-derived electrochemical gas sensors, comprised of a homogeneous dispersion of catalystmodified carbon powder in porous, organically modified silica, is introduced. The porous structure of the electrode material permits high gas permeability. Their hydrophobic surface rejects water, leaving only a very thin layer at the outermost surface in contact with the electrolyte and thus minimizing effects of liquid side mass transfer. The carbon powder provides electric conductivity, and the catalyst guarantees selectivity and sensitivity. Heat-treated Co tetramethoxymesoporphyrin modified composite ceramic-carbon electrodes exemplify this new class of gas sensors. Detection of several gases by anodic (sulfur dioxide) or cathodic (carbon dioxide and oxygen) reactions is demonstrated. Metrological characteristics of a prototype oxygen sensor are presented.

Original languageAmerican English
Pages (from-to)2409-2414
Number of pages6
JournalAnalytical Chemistry
Volume67
Issue number14
DOIs
StatePublished - 1 Jul 1995

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