Electrocatalysis of Anodic Oxygen‐Transfer Reactions: Oxidation of Ammonia at Anodized Ag‐Pb Eutectic Alloy Electrodes
- 1 October 1995
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 142 (10) , 3420-3423
- https://doi.org/10.1149/1.2049997
Abstract
Ammonia in alkaline media is oxidized to at anodized Ag‐Pb eutectic alloy electrodes (2.4% Ag by weight). The anodic signal is diminished for , and this attenuation is attributed to the protonation of to form . Protonation of is concluded to prevent adsorption of the at silver sites in the electrode surface as the initial step in the electrocatalytic oxidation mechanism. For , the anodic signal decreases with time because of the loss of by volatilization. The heterogeneous rate constant for oxidation of to is significantly smaller than that for oxidation of ethylamine (EA) to acetaldehyde and . Hence, is concluded to be a product of ethylamine oxidation at a rotated disk electrode whereas acetaldehyde and are the final products of the exhaustive electrolysis of ethylamine.Keywords
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