Abstract
In recent years, secondary metal air batteries have received considerable attention as promising technology for energy storage in combination with renewable energy sources. The oxidation of carbon in conventional gas-diffusion electrodes reduces the life of the secondary metal-air batteries. Replacement of the carbon-based material with zeolite is a possible solution for overcoming this problem which is the aim of this work.Zeolite is a natural or synthetic porous material which provides the necessary gas permeability. The required hydrophobicity of the electrodes is ensured by mixing the zeolite with an appropriate amount of polytetrafluoroethylene following a specially developed procedure.The experiments are performed in a home designed test cell which ensures measurements in both half-cell and full cell configuration. In this study the testing is carried out in 3-electrode homemade half-cell configuration with hydrogen reference electrode. The cell was subjected to cycling at charge/discharge current ± 2 mA/cm2 respectively.The obtained results show that the replacement of carbon with zeolite in the gas diffusion layer is a promising direction for optimization of the gas diffusion electrode.
Highlights
In order to turn renewable energy sources (RES) into the main energy source it is necessary to store the produced energy, which requires "innovative solutions, next-generation technologies, including potentially revolutionary technologies" [1]
After the replacement of carbon black with zeolite in the classical gas-diffusion layer (GDL)-recipe, PTFE-fibers net cover the zeolite grains, which is a prerequisite for sufficient hydrophobicity (Figure 3)
This technology was used for preparation of the second generation gas-diffusion electrode (GDE) with bifunctional catalytic layer (CL)
Summary
In order to turn renewable energy sources (RES) into the main energy source it is necessary to store the produced energy, which requires "innovative solutions, next-generation technologies, including potentially revolutionary technologies" [1]. Batteries have an important role in integrating and optimizing the application of RES. One of the directions for new technological solutions is the development of rechargeable metal/air systems. Research in this area paves the way for further industrial production.
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More From: Journal of Electrochemical Science and Engineering
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