Chemical Papers

, Volume 73, Issue 5, pp 1103–1112 | Cite as

Influence of current density and W concentration on Co–W alloys used as catalysts in electrodes for Li–O2 batteries

  • Josiel Martins CostaEmail author
  • Thayane Carpanedo de Morais Nepel
  • Ambrósio Florêncio de Almeida Neto
Original Paper


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.


Coating materials Co–W alloy Electroplating Nickel foam Steel mesh 



This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001. The authors thank the Espaço da EscritaPró-Reitoria de Pesquisa/UNICAMP for the language services provided.


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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2018

Authors and Affiliations

  • Josiel Martins Costa
    • 1
    Email author
  • Thayane Carpanedo de Morais Nepel
    • 1
  • Ambrósio Florêncio de Almeida Neto
    • 1
  1. 1.Department of Products and Processes Design, School of Chemical EngineeringUniversity of CampinasCampinasBrazil

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