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Journal of Electrochemistry ›› 2005, Vol. 11 ›› Issue (1): 58-61.

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Influence of Rare Earth Oxide on the Performance of Secondary Zinc Electrodes

MENG Xian-ling, YANG Hua-bin~*, WANG Jun-hong, ZHOU Zuo-xiang   

  1. (Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071,China
  • Received:2005-02-28 Revised:2005-02-28 Online:2005-02-28 Published:2005-02-28

Abstract: Influence of La(OH)_(3 )or Ce(OH)_3in secondary zinc electrode was investigated by the cyclic voltammetry, potentiodynamic polarizationand potentiostatic polarization tests and influence of La_2O_3or CeO_2in the charge/discharge performance of Zn/Ni battery was studied by galvanostatic charge/discharge experiment. The results showed that the film of rare earth hydroxide prevented the zincate species from transferring toward solution, enhanced hydrogen overpotential and decreased thecorrosion current density (i_(corr)), and therefore inhibited zinc corrosion. The potentiostatic polarization results at100mV overpotential showed thatLa(OH)_3or Ce(OH)_3coated on the zinc electrode effectively suppressed the zinc dendrite growth. The La_2O_(3 )or CeO_2addition to the calcium zincate electrode improved the cycle performance of Zn/Ni battery.

Key words: Secondary zinc electrode, La(OH)_3or Ce(OH)_3, La_2O_3or CeO_2

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