Characteristics of Pt/Nafion((R)) electrodes prepared by an impregnation-reduction method in sensing hydrogen

Citation
Bj. Hwang et al., Characteristics of Pt/Nafion((R)) electrodes prepared by an impregnation-reduction method in sensing hydrogen, J NEW M E S, 4(2), 2001, pp. 69-75
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF NEW MATERIALS FOR ELECTROCHEMICAL SYSTEMS
ISSN journal
1480-2422 → ACNP
Volume
4
Issue
2
Year of publication
2001
Pages
69 - 75
Database
ISI
SICI code
1480-2422(200104)4:2<69:COPEPB>2.0.ZU;2-A
Abstract
The influences of reductant concentration and platinum loading on the respo nse, recovery time and sensitivity of Pt/Nafion((R)) electrodes prepared by an impregnation-reduction method for detecting hydrogen were investigated Electrodes with a Pt loading of 4.99 mg cm(-2) obtained using 0.0107 M Pt(N H3)(4)Cl-2 and 0. 06 M NaBH4, showed a maximum sensitivity of 0.0744 muA pp m(-1) in the H-2 concentration range of 0-4508 ppm. However; electrodes wit h a Pt loading of 7.40 mg cm(-2) made using 0.015 M Pt(NH3)(4)Cl-2 and 0.06 M NaBH4 showed the fastest response and recovery. Generally both the respo nse and the recovery time decreased with increasing hydrogen concentration. A model is proposed to illustrate the sensing phenomenon.