Electrochemical deposition of NiCu alloys in citrate solutions
Author affiliations
DOI:
https://doi.org/10.15625/2525-2321.2017-00512Keywords:
NiCu alloy films, electrodeposition, electrodes, hydrogen evolution reaction, alkaline solutionAbstract
This paper presents the research results on electrochemical deposition of NiCu alloy films in containing citrate solutions. Influence of the concentration of the metallic ions to the electrodeposition was studied using linear polarization method. Alloy films have been fabricated by potentiostatic and galvanostatic methods. Element composition and morphology surface of the films was analyzed using EDS and SEM methods. The polarization curves are divided into two distinct regions, the more positive potential than -0.8 V/SCE is the discharge of Cu2+ with the critical current density, the more negative potential than -0.8 V/SCE is the co-discharge of Cu2+ and Ni2+ to alloying of NiCu. The presence of Ni2+ promotes Cu2+ discharge with critical current density at electrode potential -0.4 V/SCE. When the cathode potential decrease causes Ni composition increased and the Cu composition decreased. Cathode current density in the range of -4 to -8 mA/cm2 strong influence on the alloy composition, Ni composition increases with cathode current density.
Keywords. NiCu alloy films, electrodeposition, electrodes, hydrogen evolution reaction, alkaline solution.
[h1]Hai câu này sai ngữ pháp và không rõ ý tác giả định viết gì để sửa!
Downloads
References
P. Calleja, J. Esteve, P. Cojocaru, L. Magagninc, E. Vallés, E. Gómeza. Developing plating baths for the production of reflective Ni-Cu films, Electrochimica Acta, 62, 381-389 (2012).
Desislava Goranova, Georgi Avdeev, Rashko Rashkov. Electrodeposition and characterization of Ni–Cu alloys, Surface & Coatings Technology, 240, 204-210 (2014).
Casey R. Thurber et al. Electrodeposition of 70-30 Cu-Ni nanocomposite coatings for enhanced mechanical and corrosion properties, Current Applied Physics, 16, 387-396 (2016).
Solmaz R., DTner A., Kardas G. The stability of hydrogen evolution activity and corrosion behavior of NiCu coatings with long-term electrolysis in alkaline solution, Int. J. Hydrogen Energy, 34, 2089-94 (2009).
Shaohua Wang et al. Electrodeposition mechanism and characterization of Ni-Cu alloy coatings from a eutectic-based ionic liquid, Applied Surface Science, 288, 530-536 (2014).
Sang Hyun Ahn et al. Electrochemically fabricated NiCu alloy catalysts for hydrogen production in alkaline water electrolysis, International Journal of Hydrogen Energy, 38, 13493-13501 (2013).
D. M. F. Santos et al. Platinume rare earth electrodes for hydrogen evolution in alkaline water electrolysis, International Journal of Hydrogen Energy, 38, 3137-3145 (2013).
Krit Ngamlerdpokin, Nisit Tantavichet. Electrodeposition of nickel- copper alloys to use as a cathode for hydrogen evolution in an alkaline media, International Journal of Hydrogen Energy, 39, 2505-2515 (2014).
Subbaraman R et al. Trends in activity for the water electrolyser reactions on 3d M (Ni, Co, Fe, Mn) hydr(oxy)oxide catalysts, Nat Mater., 11, 550-557 (2012).
Nørskov JK. et al. Trends in the exchange current for hydrogen evolution, J. Electrochem. Soc., 152, J23-26 (2005).
