Electrochemical Behavior of Sodium Azide at Pt and Au Electrodes in Sodium Sulfate Electrolyte A DEMS Study

A. Daimia, S. Wasmus, R. F. Savine, C. C. Liu

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14 Scopus citations

Abstract

The electro-oxidation and -reduction of sodium azide at porous painted platinum and gold electrodes was studied using the multipurpose electrochemical mass spectrometry (MPEMS) which was operated in the differential electrochemical mass spectrometry (DEMS) mode. The platinum electrode was found to be active for electro-oxidation as well os for electroreduction. Above 0.3 V vs, Hg/Hg2SO4? azide is oxidized to give N2, NO, NO2, and N2O. Reduction of azide takes place below -0.9 V forming N2f N2H4, and possibly NH3. In contrast to platinum, gold showed only activity for the electro-oxidation of azide leading to the formation of N2, NO, NO2, and N2O above 0.5 V. Evidence for a reaction without evolution of volatile products was also found taking place above 0.1 V. A reaction mechanism is discussed emphasizing the role of adsorbed hydrogen and oxygen.

Original languageEnglish
Pages (from-to)3735-3740
Number of pages6
JournalJournal of the Electrochemical Society
Volume142
Issue number11
DOIs
StatePublished - Nov 1995

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