How changes in interfacial pH lead to new voltammetric features: The case of the electrochemical oxidation of hydrazine

Antony Cyril Arulrajan, Christophe Renault, Stanley C.S. Lai* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)


The electrochemical oxidation of hydrazine was investigated in strongly and weakly pH buffered solutions to reveal the role of buffer capacity in proton-electron transfer redox reactions. In sufficiently buffered solutions, a single voltammetric feature was observed. However, increasing the hydrazine concentration (or, equivalently, moving to an insufficiently buffered solution) gave rise to a second voltammetric feature. These results are rationalised with a conceptually simple model and finite element simulations. We demonstrate that the new voltammetric feature is caused by a large change in the pH at the electrode surface as the reaction proceeds. Importantly, we show that the occurrence of additional voltammetric features are general for proton-electron transfer reactions in insufficiently buffered solutions, and should not be confused with changes in the reaction mechanism.

Original languageEnglish
Pages (from-to)11787-11793
Number of pages7
JournalPhysical chemistry chemical physics
Issue number17
Publication statusPublished - 7 May 2018


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