ELECTROCATALYTIC DECOMPOSITION OF HYDROGEN-SULFIDE

The recently discovered phenomenon of nonfaradaic electrochemical modification of catalytic activity (NEMCA) was explored for the electrocatalytic decomposition of H2S to H-2 and S2 over Pt electrodes at 600-750-degrees-C and 1 atm. It was found that upon applying a potential to Pt supported on a O2...

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Bibliographic Details
Published in:Catalysis letters 1992-09, Vol.13 (3), p.289-295
Main Authors: ALQAHTANY, H, CHIANG, PH, ENG, D, STOUKIDES, M, ROBBAT, A
Format: Article
Language:English
Subjects:
Chemistry
Chemistry, Physical
Electrochemistry
Exact sciences and technology
General and physical chemistry
Kinetics and mechanism of reactions
Physical Sciences
Science & Technology
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Summary:The recently discovered phenomenon of nonfaradaic electrochemical modification of catalytic activity (NEMCA) was explored for the electrocatalytic decomposition of H2S to H-2 and S2 over Pt electrodes at 600-750-degrees-C and 1 atm. It was found that upon applying a potential to Pt supported on a O2- conducting yttria-stabilized zirconia disk, the decomposition of H2S significantly increased up to a factor of 11 at 600-degrees-C. The results appear to verify several aspects of NEMCA including the phenomenon that the electrolyte needs not to conduct reaction-specific species and that the degree of rate enhancement is related to the working electrode polarization. In addition, results indicate that separate chambers are not always required for electrocatalysis.
ISSN:1011-372X
1572-879X
DOI:10.1007/BF00771002