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Korean Journal of Chemical Engineering

, Volume 33, Issue 4, pp 1447–1455 | Cite as

Electrochemical performance of three shaped ZnO nanoparticles prepared in LiOH, NaOH and KOH alkaline solutions as anodic materials for Ni/Zn redox batteries

  • Younghwan Im
  • Sora Kang
  • Byeong Sub Kwak
  • Kyoung Soo Park
  • Tae Woo Cho
  • Jin-Sik Lee
  • Misook KangEmail author
Materials (Organic, Inorganic, Electronic, Thin Films)

Abstract

ZnO nanoparticles with three morphologies were synthesized by a hydrothermal route at 120 °C for 3 h in high alkaline aqueous solutions of LiOH, NaOH, and KOH. We analyzed them by X-ray diffraction (XRD), scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), cyclic voltammetry (CV), Zeta potential measurement, and impedance. XRD and SEM showed that the obtained ZnO nanoparticles had high purity and perfect crystallinity, and the morphologies of the particles prepared in the LiOH, NaOH, and KOH solutions showed nanoplate, nanobead, and nanorod shapes, respectively. CV showed that the nanoplate ZnO-LiOH and nanorod ZnO-KOH have superior electrochemical activity to that of the other ZnO nanostructures. As electrode materials of Ni/Zn redox batteries, the nanoplate ZnO-LiOH showed a significantly improved cycle stability after the 30 th cycle compared to that of ZnO-NaOH and conventional ZnO with a mean discharge capacity of 153 mA h g−1, a cell efficiency of 93%, and higher discharge voltages of 1.9. In addition, during the charging/discharging cycles, the growth of zinc dendrite clusters could be suppressed, which resulted in an improvement in the cycle stability of the Ni/nanoplate ZnO-LiOH redox cell.

Keywords

Ni/Zn Redox Battery ZnO Nanoparticles Charge/Discharge Zinc Dendrite Clusters 

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Copyright information

© Korean Institute of Chemical Engineers, Seoul, Korea 2016

Authors and Affiliations

  • Younghwan Im
    • 1
  • Sora Kang
    • 1
  • Byeong Sub Kwak
    • 1
  • Kyoung Soo Park
    • 2
  • Tae Woo Cho
    • 2
  • Jin-Sik Lee
    • 2
  • Misook Kang
    • 1
    Email author
  1. 1.Department of Chemistry, College of ScienceYeungnam UniversityGyeongsan, GyeongbukKorea
  2. 2.Research & Development CenterVitzrocell Co.Yesan-gun, ChungnamKorea

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