Journal
JOURNAL OF POWER SOURCES
Volume 160, Issue 2, Pages 1436-1441Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2006.02.019
Keywords
Zn alloys; hydrogen overpotential; dendrite formation; electrochemical behavior; morphology
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In our continued efforts for improving the performance of zinc anodes for a Zn/air battery, we now report the preparation of three alloys and improved performances of anodes made up with these alloys. The alloys contained zinc, nickel, and indium with different weight percentages and were calcined at two different temperatures. Out of the six alloys, the alloy which has a composition of zinc 90%, nickel 7.5% and Indium 2.5% and fired at 500 degrees C is found to be the best. In the case of the hydrogen evolution reaction, this alloy had its potential shifted to a more negative potential. As far as the cyclic voltammograms were concerned, the difference between the anodic and cathodic part was minimal when compared with other alloys. Surprisingly, this alloy had reversibility even after 100 cycles of the cyclic voltammogram. This is a clear indication that dendrite formation was reduced to a considerable extent. Images taken with a scanning electron microscope also indicated reduced dendrite formation. (c) 2006 Elsevier B.V. All rights reserved.
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