Experimental investigation of potential oscillations during the electrocatalytic oxidation of urea on Ni catalyst in alkaline medium

Vedasri Vedharathinam, Gerardine G. Botte

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

For the first time, potential oscillations are observed during the electrochemical oxidation of urea on Ni catalyst in alkaline medium. Electrochemical measurements, in combination with in situ time-resolved surface enhanced Raman (SER) spectroscopy studies, revealed that the potential oscillations might be caused by the periodic reduction and oxidation of the electrochemically active NiOOH catalyst to its inactive Ni(OH)2state and vice versa. Cyclic voltammetry and rotating disc electrode voltammetry suggests that mass transfer of urea to the double layer region due to local convection caused by oxygen evolution reaction does not play a role in the potential oscillation mechanism.

Original languageEnglish
Pages (from-to)21806-21812
Number of pages7
JournalJournal of Physical Chemistry C
Volume118
Issue number38
DOIs
StatePublished - Sep 25 2014

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