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Type: Artigo
Title: Influence of current density and w concentration on co–w alloys used as catalysts in electrodes for Li–O2 batteries
Author: Costa, Josiel Martins
Nepel, Thayane Carpanedo de Morais
Almeida Neto, Ambrósio Florêncio de
Abstract: In this study, we verified the influence of tungsten (W) concentrations and current density for the electroplating of the cobalt–tungsten (Co–W) alloy on two substrates (nickel foam and steel mesh). The statistical evaluation showed a mathematical model that related the efficiency of deposition with the parameters analyzed. The efficiency varied from 0 to 60.05% for the nickel foam and 0 to 64.39% for the steel mesh. Scanning electron microscopy showed that to increase the current density made the surface less uniform, due to the size of the grains formed and X-ray diffraction pointed to the formation of amorphous coating alloys. Electrodeposition of the alloy in the steel mesh occurred with greater contribution by forced convection, as opposed to the nickel foam that had a smaller contribution, according to the effects of fluid dynamics. The Co–W alloys evidenced by energy-dispersive X-rays spectroscopy were tested in the cell with a constant pressure of O2 and presented an alternative for the use of catalysts in Li–O2 batteries
Subject: Eletrodeposição
Country: Alemanha
Editor: Springer
Rights: Fechado
Identifier DOI: 10.1007/s11696-018-0661-x
Date Issue: Mar-2019
Appears in Collections:FEQ - Artigos e Outros Documentos

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