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Article
Author(s)

Aleksandra Gavrilović-Wohlmuther1, Andreas Laskos1, Christian Zelger1, 2, Bernhard Gollas1, 2 and Adam Harding Whitehead3

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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