Investigation of Gold Electrosorption onto Gold and Carbon Electrodes using an Electrochemical Quartz Crystal Microbalance
| Autor: | Kh. Avchukir, Azamat Taurbekov, Madina Mansurova, M. Biisenbayev, Vladimir Pavlenko, Mukhtar Yeleuov, Zh. Supiyeva, G. T. Smagulova, Z. A. Mansurov |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Scanning electron microscope General Chemical Engineering Inorganic chemistry chemistry.chemical_element 02 engineering and technology Electrolyte Electrochemistry electrochemical quartz crystal microbalance Metal lcsh:Chemistry 0502 economics and business General Materials Science 05 social sciences General Chemistry Quartz crystal microbalance 021001 nanoscience & nanotechnology Condensed Matter Physics gold activated carbon chemistry lcsh:QD1-999 Colloidal gold visual_art visual_art.visual_art_medium Cyclic voltammetry 0210 nano-technology Carbon rice husk 050203 business & management |
| Zdroj: | Eurasian Chemico-Technological Journal , Vol 21, Iss 4, Pp 283-289 (2019) |
| ISSN: | 2522-4867 1562-3920 |
| Popis: | The adsorption behavior of Au3+ ions on metal electrodes has been studied using an electrochemical quartz crystal microbalance combined with the cyclic voltammetry technique. The experiments were carried out for HAuCl4 using 0.1 mol·L-1 HCl (pH~1) as a background electrolyte solution. The kinetics of electroreduction of Au3+ ions on the rice husk based activated carbon and gold electrodes in chloride electrolytes by the cyclic voltammetry and the electrochemical quartz crystal microbalance with a variation of the scan rate in the range of 5‒50 mV·s-1 has been studied. The diffusion coefficient of Au3+ ions for the tested solution on gold and carbon electrodes was determined by the cyclic voltammetry method on the basis of the Randles-Ševčik equation. It is found that electroreduction of gold goes via the discharge of AuCl4- complexes to the formation of metallic gold with a current efficiency of 97‒99%. The scanning electron microscopic images of the gold adsorbed carbon surface was taken to see gold particles and their morphology. In SEM images, it is clearly seen that the surface of carbon has a relief structure and gold has grown in the form of clusters. The smallest gold nanoparticles that could be examined were 100‒250 nm in diameter on the surface of the c arbon electrode. |
| Databáze: | OpenAIRE |
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