Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
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Zinc Electrodeposition in the Presence of an Aqueous Electrolyte Containing 1-Ethylpyridinium Bromide: Unexpected Oddities*

Max E. Easton A , Lisa C. Player A , Anthony F. Masters A and Thomas Maschmeyer A B
+ Author Affiliations
- Author Affiliations

A The Laboratory for Advanced Catalysis for Sustainability, School of Chemistry F11, University of Sydney, Sydney, NSW 2006, Australia.

B Corresponding author. Email: thomas.maschmeyer@sydney.edu.au

Australian Journal of Chemistry 70(9) 1025-1031 https://doi.org/10.1071/CH17281
Submitted: 23 May 2017  Accepted: 18 July 2017   Published: 3 August 2017

Abstract

The reversible electrodeposition of zinc was investigated in an aqueous electrolyte containing zinc bromide (50 mM) and 1-ethylpyridinium bromide ([C2Py]Br, 50 mM) by cyclic voltammetry, chronoamperometry, and scanning electron microscopy. Unusual voltammetric behaviour for the Zn/ZnII redox couple was observed in the presence of [C2Py]Br. Passivation of the redox couple was observed after a single deposition–stripping cycle at switching potentials more negative than -1.25 V versus Ag/AgCl. This unusual behaviour was attributed to the reduction of 1-ethylpyridinium cations to pyridyl radicals and their follow-up reactions, which influenced the zinc electrochemistry. This behaviour was further seen to modify the nucleation process of electrodeposition, which altered the morphology of zinc electrodeposits.


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