Page 88 - Book of Abstracts

th
8 Biannual Conference on Chemistry - CHEM 08

Nickel Oxide Nanoparticles Supported on Graphitized
Carbon for Ethanol Oxidation in NaOH Solution

R.M. Abdel Hameed
Chemistry Department, Faculty of science, Cairo University, Giza, Egypt
.

ABSTRACT

NiO nanoparticles were deposited on graphitized carbon support [NiO/G-C]
through precipitating nickel hydroxide species followed by calcination at 400 °C.
Physicochemical characterization indicated the appearance of two diffraction
planes at 2θ values of 43.22° and 62.84° in XRD pattern of NiO/G-C to confirm
the nickel oxide species formation. HRTEM image showed a finger print of
deposited nanoparticles with lattice fringes distance of 0.152 nm that resembled
the lattice distance of NiO(220) plane. The electrocatalytic performance of
NiO/G-C electrocatalysts towards oxidizing ethanol molecules was examined in
basic solution using cyclic voltammetry, chronoamperometry and
electrochemical impedance spectroscopy. The oxidation current density of
NiO/G-C electrocatalyst was dependent on the loading amount of nickel oxide
species. The effect of varying ethanol concentration and scan rate during ethanol
oxidation reaction was studied. The reaction order with respect to ethanol
concentration was measured in the range of 0.260–0.572 at NiO/G-C
electrocatalysts containing variable nickel oxide content. Double-step
chronoamperometry was employed to calculate the catalytic rate constant and
diffusion coefficient values. They were 8.153 × 10 cm mol s and 1.424 × 10
− 1
− 1
− 7
2
3
cm s , respectively. A lower charge transfer resistance value was obtained after
2
− 1
adding ethanol molecules to NaOH solution confirming the enhanced
electrocatalytic activity of NiO/G-C during alcohol oxidation process.

BOOK OF ABSTRACTS CHEM 08 (2020) Page 87