Journal of Industrial and Engineering Chemistry, Vol.53, 247-252, September, 2017
The effects of mechanical alloying on the self-discharge and corrosion behavior in Zn-air batteries
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The corrosion behavior of Zn anodes is a major issue that must be carefully considered in Zn-air batteries. In this work, mechanically alloyed Zn.Bi specimens with different compositions are fabricated at various milling times in order to enhance the electrochemical performance of the Zn-air batteries. The presence of Bi, which could be detected with bright contrast by backscattered FE-SEM, does not change the crystal structure of Zn. While the pure Zn exhibits 74.40% of a discharge capacity retention, all the Zn.Bi alloy materials deliver more than 90% of a discharge capacity retention. Especially, the anode containing 2 wt% of Bi with a 6 h milled material (B3H6Bi2) exhibits the highest corrosion inhibition efficiency (91.501%) and lowest corrosion current density (0.326 mA cm-2). In particular, 99.50% of a discharge capacity retention is achieved with B3H6Bi2. In terms of self-discharge behavior, the mechanical alloyed Zn.Bi materials are suggested as promising anode materials for use in Zn-air batteries.
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