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Plant-mediated fabrication of cobalt oxide nanoparticles and evaluation of their catalytic effects on electro-oxidation of formaldehyde |
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| Authors: | Fatemeh Rigi Zahra Yavari Fariba Kaedi |
| Institution: | 1. Department of Production and Utilization of Medicinal Plants, Faculty of Agriculture, Higher Education Complex of Saravan, Saravan, Iran;2. Department of Chemistry, University of Sistan and Baluchestan, Zahedan, Iran
Renewable Energies Research Institute, University of Sistan and Baluchestan, Zahedan, Iran;3. Department of Chemistry, University of Sistan and Baluchestan, Zahedan, Iran |
| Abstract: | Cobalt oxide nanoparticles (Co3O4-NPs) were synthesized by aqueous extract of Artemisia vulgaris plant at 50°C. The biosynthesized extract mediated Co3O4-NPs were characterized through different methods containing FT-IR (Fourier transform infrared spectroscopy), FESEM (Field emission scanning electron microscopy), EDS (Energy-dispersive x-ray spectroscopy), and XRD (x-ray diffraction). Co3O4-NPs as an efficient and practical catalyst was employed for the electrochemical oxidation of formaldehyde; which was an irreversible charge transfer controlled by mass transfer. The coefficients of electron transfer and diffusion were 0.87 and 0.122 cm2/s for formaldehyde oxidation on Co3O4 electrode, respectively. The formation of the CoOOH species during potential sweeping appears to be involved in the catalytic activity of the Co3O4 toward formaldehyde oxidation. |
| Keywords: | Artemisia vulgaris cobalt oxide formaldehyde oxidation green chemistry Phyto-synthesis |