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http://dx.doi.org/10.7316/KHNES.2012.23.4.390

Effects of Electrolyte Concentration on Growth of Dendritic Zinc in Aqueous Solutions  

Shin, Kyung-Hee (Distributed Power Generation and Energy Storage Group, Korea Institute of Energy Research)
Jung, Kyu-Nam (Distributed Power Generation and Energy Storage Group, Korea Institute of Energy Research)
Yoon, Su-Keun (Distributed Power Generation and Energy Storage Group, Korea Institute of Energy Research)
Yeon, Sun-Hwa (Distributed Power Generation and Energy Storage Group, Korea Institute of Energy Research)
Shim, Joon-Mok (Distributed Power Generation and Energy Storage Group, Korea Institute of Energy Research)
Joen, Jae-Deok (Distributed Power Generation and Energy Storage Group, Korea Institute of Energy Research)
Jin, Chang-Soo (Distributed Power Generation and Energy Storage Group, Korea Institute of Energy Research)
Kim, Yang-Soo (Suncheon center, Korea Basic Science Institute)
Park, Kyoung-Soo (Department of Chemical Engineering, Soonchunhyang University)
Jeong, Soon-Ki (Department of Chemical Engineering, Soonchunhyang University)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.23, no.4, 2012 , pp. 390-396 More about this Journal
Abstract
In order to understand the nature of dendritic zinc growth, electrochemical zinc redox reaction on nickel plate was investigated in aqueous solutions containing different concentrations, 0.2, 0.1 and 0.02 $mol{\cdot}dm^{-3}$ (M), of zinc sulfate ($ZnSO_4$) or zinc chloride ($ZnCl_2$). Zinc ion was efficiently reduced and oxidized on nickel in the high-concentration (0.2 M) solution, whereas relatively poor efficiency was obtained from the other low-concentration solutions (0,1 and 0.02 M). Cyclic voltammetry (CV) analysis revealed that the 0.2 M electrolyte solution decomposes at more positive potentials than the 0.1 and the 0.02 M solutions. These results suggested that the concentration of electrolyte solution and anion would be an important factor that suppresses the reaction of the zinc dendrite formation. Scanning Electron Microscopy (SEM) data revealed that the shape of dendritic zinc and its growing behavior were also influenced by electrolyte concentration.
Keywords
Zn-air battery; Dendritic zinc; Negative electrode; Electrolyte;
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Times Cited By KSCI : 1  (Citation Analysis)
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