"Nanotechnology and nanomaterials"

Products of NiAl3 alloy etching in alkali solution
Saldan I.1,2, Paschalidou E. M.2, Dobrovetska O.3, Bilan O.4, Kuntyi O.3

1 Department of Physical and Colloid Chemistry, Ivan Franko National University of Lviv. Kyryla and Mefodia St. 6, 79005-Lviv, Ukraine
2 Department of Chemistry, Ångström Laboratory, Uppsala University, Box 538, Uppsala 75121, Sweden
3 Institute of Chemistry, Lviv Polytechnic National University, Bandery St. 12, 79013-Lviv, Ukraine, E-mail: oksana_dobrovetska@ukr.net
4 Industrial Company “Autonomous Power Sources”, Lvivska St. 2, 80074-Velyki Mosty, Ukraine

Production of porous nickel is very attractive since it is a common material for catalytic electrochemical and solid-gas reactions [1]. In this experimental work porous nickel was successfully produced by chemical dealloying of NiAl3 alloy [2].
XRD analysis confirmed that prepared by arc melting NiAl3 alloy consists of main NiAl3 and two secondary Ni2Al3 and NiAl3 phases. After etching in aqueous solution of 5M NaOH at room temperature during 8 days the aluminium based alloy totally changed to metallic nickel with residual NiO and SiO2. Strong and wide diffraction peaks of the pure Ni suggested on nanoporous structure of dealloyed material. SEM-EDX directly confirmed porous surface morphology with nanopores less than 20 nm. Developed method of chemical dealloying and detailed surface analysis of the products of NiAl3 alloy etching in alkali solution was made using SEM-EDX and XRD spectroscopies.

1.	Du H., Zhou C., Xie X., Li H., Qi W., Wu Y., Liu T. Pseudocapacitance of nanoporous Ni@NiO nanoparticles on Ni foam substrate: influence of the annealed temperature // Int. J. Hydrogen Energy. - 2017. - 42. - P. 15236-15245.
2.	Miettinen J. Thermodynamic description of the Cu-Al-Ni system at the Cu-Ni side // CALPHAD: Comput. Coupling Phase Diagrams Thermochem. - 2005 - 29. P. 40-48.