G. Munuera, A.R. González-Elipe, A. Muñoz, A. Fernández, J. Soria, J. Conesa, J. Sanz
{"title":"Mechanism of hydrogen gas-sensing at low temperatures using Rh/TiO2 systems","authors":"G. Munuera, A.R. González-Elipe, A. Muñoz, A. Fernández, J. Soria, J. Conesa, J. Sanz","doi":"10.1016/0250-6874(89)87040-4","DOIUrl":null,"url":null,"abstract":"<div><p>The effects of H<sub>2</sub> adsorption on the conductivity of pressed pellets of a Rh/TiO<sub>2</sub> polycrystalline material are studied as a function of the degree of hydroxylation and reduction of the TiO<sub>2</sub> support.</p><p>The process involved in the enhancement of conductivity induced by the adsorption of H<sub>2</sub> at 295 K is examined in detail with the aid of different techniques including e.p.r., n.m.r. and i.r. spectroscopies. The results show that this material can be an efficient sensor for H<sub>2</sub> at 295 K in ambient atmosphere. A mechanism is proposed for the behaviour of this H<sub>2</sub> sensor, which involves electron and proton transfer from the Rh metal to the TiO<sub>2</sub> semiconductor in the presence of H<sub>2</sub>.</p></div>","PeriodicalId":101159,"journal":{"name":"Sensors and Actuators","volume":"18 3","pages":"Pages 337-348"},"PeriodicalIF":0.0000,"publicationDate":"1989-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0250-6874(89)87040-4","citationCount":"27","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Sensors and Actuators","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0250687489870404","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 27
Abstract
The effects of H2 adsorption on the conductivity of pressed pellets of a Rh/TiO2 polycrystalline material are studied as a function of the degree of hydroxylation and reduction of the TiO2 support.
The process involved in the enhancement of conductivity induced by the adsorption of H2 at 295 K is examined in detail with the aid of different techniques including e.p.r., n.m.r. and i.r. spectroscopies. The results show that this material can be an efficient sensor for H2 at 295 K in ambient atmosphere. A mechanism is proposed for the behaviour of this H2 sensor, which involves electron and proton transfer from the Rh metal to the TiO2 semiconductor in the presence of H2.
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