| Autor: |
Tammam RH; Department of Chemistry, Faculty of Science, Cairo University, Cairo, Egypt., Touny AH; Department of Chemistry, Faculty of Science, Helwan University, Helwan, Egypt.; Department of Chemistry, College of Science, King Faisal University, Al-Hassa, Kingdom of Saudi Arabia., Saleh MM; Department of Chemistry, Faculty of Science, Cairo University, Cairo, Egypt. mahmoudsaleh90@yahoo.com.; Department of Chemistry, College of Science, King Faisal University, Al-Hassa, Kingdom of Saudi Arabia. mahmoudsaleh90@yahoo.com. |
| Abstrakt: |
Reticulated vitreous carbon (RVC), a high surface area electrode (40 cm 2 /cm 3 ), has been modified with nickel oxide nanoparticles (nano-NiO x ) and used for electrochemical oxidation of urea from alkaline solution. For the cyclic voltammetry measurements, the used dimensions are 0.8 cm × 0.8 cm × 0.3 cm. The purpose was to offer high specific surface area using a porous open network structure to accelerate the electrochemical conversion. NiO x nanoparticles have been synthesized via an electrochemical route at some experimental conditions. The morphological, structural, and electrochemical properties of the RVC/nano-NiO x are characterized by using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), cyclic voltammetry (CV), and potentiostatic measurements. The fabricated electrode, RVC/nano-NiO x , demonstrates high electrocatalytic activity towards urea oxidation in an alkaline electrolyte. The onset potential of the RVC/nano-NiO x compared to that of the planar GC/NiO x is shifted to more negative value with higher specific activity. The different loadings of the NiO x have a substantial influence on the conversion of urea which has been evaluated from concentration-time curves. The urea concentration decreases with time to a limit dependent on the loading extent. Maximum conversion is obtained at 0.86 mg of NiO x per cm 3 of the RVC matrix. |
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