scholarly journals Specific carbon/iodide interactions in electrochemical capacitors monitored by EQCM technique

2021 ◽  
Vol 14 (4) ◽  
pp. 2381-2393
Author(s):  
Anetta Platek-Mielczarek ◽  
Elzbieta Frackowiak ◽  
Krzysztof Fic
Keyword(s):  
Alkali Metal ◽  
Aqueous Solutions ◽  
Quartz Crystal Microbalance ◽  
Porous Carbon ◽  
Quartz Crystal ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Ion Fluxes ◽  
Carbon Electrodes ◽  
Alkali Metal Cations ◽  
Porous Carbon Electrodes

This paper reports on the ion fluxes at the interfaces of various porous carbon electrodes/aqueous solutions of alkali metal cations (Na+, K+ and Rb+) and iodide anions, monitored by an electrochemical quartz crystal microbalance (EQCM).

scholarly journals Investigation of Gold Electrosorption onto Gold and Carbon Electrodes using an Electrochemical Quartz Crystal Microbalance

2019 ◽  
Vol 21 (4) ◽  
pp. 283
Author(s):  
Z. Mansurov ◽  
Zh. Supiyeva ◽  
Kh. Avchukir ◽  
A. Taurbekov ◽  
M. Yeleuov ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Background Electrolyte ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Carbon Surface ◽  
Carbon Electrodes ◽  
Electron Microscopic ◽  
Sem Images ◽  
Cyclic Voltammetry Method

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.

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