| 초록 |
ZnO nanoparticles with three morphologies were synthesized by a hydrothermal route at 120 oC for 3 h in high alkaline aqueous solutions of LiOH, NaOH, and KOH. the morphologies of the particles prepared in the LiOH, NaOH, and KOH solutions showed nanoplate, nanobead and nanorod morphologies, respectively, with lengths of more than 500 nm. CV showed that the nanoplate ZnO-LiOH has superior electrochemical activity to those 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 30th cycle compared to those of ZnO-NaOH and ZnO-KOH with a mean discharge capacity of 153 mA h g−1, an 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/Zn redox cells. |
