Effects of testing conditions on the performance of carbon-supported bifunctional electrodes

By Velraj, S.; Estes, A. K.; Bates, B. L.; Zhu, J. H.
Published in Electrochimica Acta 2018

Abstract

Carbon-based electrodes with a bifunctional catalyst are being studied extensively for use in rechargeable metal-air batteries. In this study, the effects of various testing conditions on the electrochemical performance, cyclic lifetime, and degradation mechanism of the electrodes prepared using the bifunctional La0.6Ca0.4CoO3 catalyst mixed with the graphitized Vulcan XC-72 carbon black and polytetrafluoroethylene were evaluated in detail. The electrochemical performance and total cycle life of the electrodes were not noticeably affected by the KOH electrolyte concentration or rest time between the charge/discharge. The charge/discharge current density used for the cyclic test significantly influenced both the total cyclic lifetime and degradation mechanism of the electrode. At the higher current densities (

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