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

Abstract : 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 rationalized 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.
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https://hal.archives-ouvertes.fr/hal-02389128
Contributor : Christophe Renault <>
Submitted on : Sunday, December 27, 2020 - 11:01:06 AM
Last modification on : Monday, January 25, 2021 - 3:58:56 PM
Long-term archiving on: : Monday, March 29, 2021 - 6:37:47 PM

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Antony Cyril Arulrajan, Christophe Renault, Stanley Lai. How changes in interfacial pH lead to new voltammetric features: the case of the electrochemical oxidation of hydrazine. Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2018, 20 (17), pp.11787-11793. ⟨10.1039/c8cp01835a⟩. ⟨hal-02389128⟩

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