Open AccessFabrication of Three-Dimensional Dendritic Ni–Co Films By Electrodeposition on Stainless Steel Substrates
Author(s) -
R. P. Silva,
S. Eugénio,
Teresa M. Silva,
M.J. Carmezim,
M.F. Montemor
Publication year - 2012
Publication title -
the journal of physical chemistry c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.401
H-Index - 289
eISSN - 1932-7455
pISSN - 1932-7447
DOI - 10.1021/jp307612g
Subject(s) - materials science , scanning electron microscope , cyclic voltammetry , electrochemistry , chemical engineering , supercapacitor , nickel , cathodic protection , porosity , cobalt , current density , austenitic stainless steel , metallurgy , electrode , composite material , corrosion , chemistry , physics , quantum mechanics , engineering
Co-deposition of nickel and cobalt was carried out on austenitic stainless steel (AISI 304) substrates by imposing a square waveform current in the cathodic region. The innovative procedure applied in this work allows creating a stable, fully developed, and open porous three-dimensional (3D) dendritic structure, which can be used as electrode for redox supercapacitors. This study investigates in detail the influence of the applied current density on the morphology, mass, and chemical composition of the deposited Ni-Co films and the resulting 3D porous network dendritic structure. The morphology and the physicochemical composition were studied by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (W). The electrochemical behavior of the materials was evaluated by cyclic voltammetry (CV). The results highlight the mechanism involved in the coelectrodeposition process and how the lower limit current density tailors the film composition and morphology, as well as its electrochemical activity
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