DocumentCode
406027
Title
Amperometric H2S sensor with Pd/Au electrode by electrochemical deposition
Author
Roh, SaeWeon ; Yao, Sheng ; Buttner, William J. ; Stetter, Joseph R.
Author_Institution
Dept. of Biol., Chem. & Phys. Sci., Illinois Inst. of Technol., Chicago, IL, USA
Volume
1
fYear
2003
fDate
22-24 Oct. 2003
Firstpage
186
Abstract
Amperometric gas sensors fabricated with various working electrode compositions were evaluated for sensitivity to H2S in the presence of up to 50% hydrogen. The WEs consisted of a gold thin-film deposited on to a porous membrane substrate and the gold film modified with two different loadings of palladium (0.3 and 8.1 mg/cm2). At a +800mV bias (vs. a Pb-mix reference electrode) the H2S sensitivities in N2 were 65.1, 16.3, 4947 nA/ppm, for pure gold, 0.03, and 8.1 mg/cm2 palladium, respectively. In 1% hydrogen, the H2S sensitivities were 38.2, 25.0, 120.9 nA/ppm for pure gold, 0.03, and 8.1 mg/cm2 palladium, respectively. In 50% hydrogen the H2S sensitivities were 32.5 and 14.4 nA/ppm for pure gold and 0.03, but at 8.1 mg/cm2 palladium loading the H2S response was not observed. Using a Pd/gold electrode increased sensitivity in air but in very high concentration of hydrogen, it was lower than the pure gold electrode.
Keywords
amperometric sensors; electrodeposition; electrodes; gas sensors; gold; hydrogen compounds; palladium; Au; H2S; H2S response; Pd; Pd-Au electrode; amperometric H2S sensor; amperometric gas sensors; electrochemical deposition; gold thin-film deposition; hydrogen concentration; palladium loading; porous membrane substrate; pure gold electrode; working electrode composition; Amperometric sensors; Biomembranes; Electrodes; Fuel cells; Gas detectors; Gold; Hydrogen; Laboratories; Palladium; Sputtering;
fLanguage
English
Publisher
ieee
Conference_Titel
Sensors, 2003. Proceedings of IEEE
Print_ISBN
0-7803-8133-5
Type
conf
DOI
10.1109/ICSENS.2003.1278925
Filename
1278925
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