Screening and further investigations on promising bi-functional catalysts for metal-air batteries with an aqueous alkaline electrolyte

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[1] Wittmaier, Dennis
[2] 1,2,Danner, Timo
[3] Wagner, Norbert
[4] 1,Friedrich, K. Andreas
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Wittmaier, D. (dennis.wittmaier@dlr.de) | 1600年 / Kluwer Academic Publishers卷 / 44期
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A wide range catalyst screening with noble metal and oxide catalysts for a metal-air battery with an aqueous alkaline electrolyte was carried out. Suitable catalysts reduce overpotentials during the charge and discharge process; and therefore improve the round-trip efficiency of the battery. In this case; the electrodes will be used as optimized cathodes for a future lithium-air battery with an aqueous alkaline electrolyte. Oxide catalysts were synthesized via atmospheric plasma spraying. The screening showed that IrO2; RuO; 2; La0.6Ca0.4Co3; Mn; 3O4; and Co3O4 are promising bi-functional catalysts. Considering the high price for the noble metal catalysts further investigations of the oxide catalysts were carried out to analyze their electrochemical behavior at varied temperatures; molarities; and in case of La1-x Ca x CoO3 a varying calcium content. Additionally all catalysts were tested in a longterm test to proof cyclability at varied molarities. Further investigations showed that Co 3O4 seems to be the most promising bi-functional catalyst of the tested oxide catalysts. Furthermore; it was shown that a calcium content of x = 0.4 in LCCO has the best performance. © 2013 Springer Science+Business Media Dordrecht;
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