Abstract
Zn electrode suffers from poor electrochemical reversibility due to various parasitical reactions in alkaline aqueous electrolyte, like electrode passivation, shape change, dendrite generation and self-corrosion, arising from the interaction of Zn with solvent water. This paper reports the enhanced electrochemical performances of zinc in alkaline potassium hydroxide-ethylene glycol (KOH-EG) electrolytes without the participation of water. Cyclic voltammetric test shows that zinc electrode is not passivated in KOH-EG organic electrolyte but has good electrochemical reversibility. The concentration of KOH exerts influence on Zn's electrode potential and charge/discharge performances with an optimum concentration of 4.5 M, boosting a 2.45 V MnO2-Zn full cell assembled with 4.5 M KOH-EG and 0.5 M H2SO4 + 0.1 M MnSO4 aqueous solution as anolyte and catholyte, respectively.
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