Abstract
The electrochemistry of hydroxylamine at low-index single-crystal platinum electrodes in acidic media has been studied by voltammetry and in-situ FTIRRAS. Hydroxylamine (HAM) reactivity at platinum is largely controlled by interaction of the other components of the solution or products of the HAM partial oxidation with the electrode surface. Reduction of HAM is a structure-sensitive reaction, at least through the structure sensitivity of the hydrogen adsorption on platinum. No formation of gaseous products was detected in the potential region corresponding to the Hupd region on Pt(111) and Pt(110). Voltammetric and spectroscopic data point to adsorbed nitric oxide (NO) as the main stable intermediate of the HAM oxidation. Being electrochemically stable in a wide potential region between ca. 0.5 and 0.8 V, adsorbed NO acts as a poison for further oxidation of HAM. The HAM oxidation to NO appears to be a structure-insensitive process, though somewhat affected by the anion coadsorption. The Tafel slope analy...
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