Investigation of alternative materials as bifunctional catalysts for electrochemical applications

Michael Vayenas; Christos Vaitsis; Georgia Sourkouni; Pavlos K. Pandis; Christos Argirusis

doi:10.15826/chimtech.2019.6.4.01

Investigation of alternative materials as bifunctional catalysts for electrochemical applications

Michael Vayenas, Christos Vaitsis, Georgia Sourkouni, Pavlos K. Pandis, Christos Argirusis

Abstract

A lab-scale custom made Zinc-Air battery cell was manufactured and tested with a variety of cathode catalysts. MnO₂ has been examined both as an Oxygen Reduction Reaction (ORR) and Oxygen Evolution Reaction (OER) catalyst, with more promising results as an ORR catalyst. MnO₂ as well as a combination of MnO₂ and MWCNTs (MOCN-10) has been examined in this work. In addition, two different Metal Organic Frameworks (MOFs), specifically HKUST-1 and MOF-74, based on Cu and Ni, respectively, were investigated as an alternative and novel cathode catalyst directly on the battery cell. A power output of 20 mW·cm^-2 was achieved by using MOCN-10, along with stability in prolonged discharge cycling at 5 mA·cm^-2. Furthermore MOF-loaded battery has demonstrated astonishing performance in pulse cycling for more than 120 hours. Moreover no dendrite formation was observed during long term pulse cycling.

Keywords

Rechargeable Zinc-air Battery; ORR; OER; Polarization; Cycling; MOFs

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DOI: https://doi.org/10.15826/chimtech.2019.6.4.01

Copyright (c) 2019 Michael Vayenas, Christos Vaitsis, Georgia Sourkouni, Pavlos K. Pandis, Christos Argirusis

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