The aim of this work was to investigate
the influence of morphology
on its electrochemical properties by comparing ZnO nanostructures
in the forms of tetrapods of different sizes, nanorods, and nanoparticles.
ZnO tetrapods were prepared by the combustion method and separated
into two fractions by size, ruling out the influence of synthesis
conditions. Structural and morphological properties of different ZnO
nanostructure morphologies were identified by using various characterization
techniques: scanning and transmission electron microscopies (SEM and
TEM), X-ray powder diffraction (XRD), nitrogen adsorption/desorption
measurements at 77 K, and UV–vis spectroscopy (UV–vis).
Analysis of electrochemical properties showed the highest active surface
area of 0.095 cm2 and the lowest peak separation value
of 61.7 mV for large ZnO tetrapods, which are close to the theoretical
values. The correlation between the pore size in different ZnO nanostructures
because of packing and their electrochemical properties is established.
We expect that the detailed analysis of ZnO nanostructures conducted
in this study will be advantageous for future electrochemical and
biosensing applications of these materials.
Zinc oxide films on AISI 304 stainless steel were prepared by electrochemical deposition using slightly acidic zinc acetate solutions under galvanostatic conditions. The prepared films were characterized by X-ray diffraction, Fourier – transform infrared spectroscopy, scanning electron microscopy and photovoltammetry analysis. It was established that as-deposited ZnO films consist of lamellar particles with intercalated CH3COO– ions. It was determined that ZnO films show n-type behavior, the incident photon-to-current efficiency (IPCE) being 2.0 % at +0.6 V in 0.1M K2SO4 solution. The observed steady-state photocurrents increased upon heat treatment at 673 K of as-deposited ZnO samples and in the presence of methanol in supporting electrolyte.
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