Abstract
One-dimensional (1D) nanostructures, such as nanotubes, nanopores, nanodots and nanocones, are characterized by better catalytic properties than bulk materials due to their large active surface area and small geometrical size. There are several methods of synthesis for these structures, including the one- and two-step methods. In the one-step method, a crystal modifier is added to the solution in order to limit the horizontal direction of structures growing during electrodeposition. In this work, cobalt nanoconical structures were obtained from an electrolyte containing CoCl2, H3BO3 and NH4Cl as the crystal modifier. Another method of production of 1D nanocones is electrodeposition of the metal into porous anodic alumina oxide (AAO) templates. This method is called the two-step method. In this case, an AAO template was obtained using two-step anodization. Then, electrodeposition of cobalt was performed from an electrolyte containing CoSO4 and H3BO3. Nanocones obtained by the two-step method show smaller geometrical size. The bulk sample was electrodeposited from the same electrolyte. The electrocatalytic properties of materials fabricated by the one-step and two-step methods were measured in 1M NaOH and compared with bulk materials. Co cones obtained by the one-step method show the worst electrocatalytic properties. The hydrogen evolution reaction started the earliest for Co nanocones electrodeposited in the templates.
Highlights
One-dimensional (1D) nanostructures are characterized by two nanometric dimention in three perpendicular directions
One-step method of synthesis the conical Co structures consisted of the electrodeposition process
In case of two-step method, the electrodeposition process was conducted into an alumina oxide (AAO) template
Summary
One-dimensional (1D) nanostructures are characterized by two nanometric dimention in three perpendicular directions They can be synthesized using several methods such as electrodeposition with crystal modifier, two-step anodization, chemical vapor deposition (CVD) and etc. In case of one-step method, the addition of crystal modifier causes promoting of a parallel direction of structures growth and blocking a horizontal one. This effect is connected with the screw dislocation driven crystal growth [2]. Obtaining conical structures allow to apply them as magnetic devices and memory sensors. In this case they are characterized by superhydrophobic properties. They were compared in terms of morphology, real active surface area and electrocatalytic properties
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