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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Aleksandra Gavrilović-Wohlmuther1, Andreas Laskos1, Christian Zelger1, 2, Bernhard Gollas1, 2 and Adam Harding Whitehead3
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DOI:10.17265/1934-8975/2015.11.010
Affiliation(s)
1. CEST—Centre of Electrochemical Surface Technology GmbH, Wiener Neustadt 2700, Austria
2. Institute for Chemistry and Technology of Materials, Graz University of Technology, Graz 8010, Austria
3. Cellstrom GmbH, Wiener Neudorf 2355, Austria
ABSTRACT
The most critical
disadvantages of the Zn-air flow battery system are corrosion of the zinc,
which appears as a high self-discharge current density and a short cycle life
due to the non-uniform, dendritic, zinc electrodeposition that can lead to
internal short-circuit. In our efforts to find a dendrite-free Zn
electrodeposition which can be utilized in the Zn-air flow battery, the surface
morphology of the electrolytic Zn deposits on a polished polymer carbon
composite anode in alkaline, additive-free
solutions was studied. Experiments were carried out with 0.1 M, 0.2 M and 0.5 M
zincate concentrations in 8 M KOH. The effects of different working conditions
such as: elevated temperatures, different current densities and different flow
velocities, on current efficiency and dendrite formation were investigated. Specially designed
test flow-cell with a central transparent window was employed. The highest Coulombic
efficiencies of 80%-93% were found for 0.5 M ZnO in 8 M KOH, at increased
temperatures (50-70 °C), current
densities of up to 100 mA·cm-2 and linear electrolyte flow
velocities higher than 6.7 cm·s-1.
KEYWORDS
Dendrite, electrochemistry, flow battery, zinc, zinc morphology.
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