Abstract
In this work, the cell potential during an electrochemical reaction in a separate compartment with anionic-membrane designed for electro-leaching of electronic-waste (E-waste) was studied. For such an approach, in the anode-side the electro-leaching of metals and the oxygen evolution reaction (OER) were monitored using a titanium plate in a HNO3 solution. Whereas, in the cathodic-side three different cathodes (smooth-Pt, titanium coated with ruthenium oxide (RuO2|Ti) and titanium coated with platinum nanoparticles (nPt/C|Ti)) were used in a solution of H2SO4. From the current versus potential characteristics, it has been demonstrated in this work that the modified electrodes promote a better cathodic current for the hydrogen evolution reaction (HER) decreasing the cell potential and then, increasing the current density of the induced metallic electro-leaching in the anodeside. The calculated space-time yield (STY) was ca. 123.4 and 64 mol.L-1.h-1.cm-2 for (nPt/C|Ti) and RuO2|Ti catalysts, respectively. These results put in clear that the use of catalysts at the nano-metric scale could be an interesting alternative to increase the selectivity and conversion of the electro-leaching process at relative low cost.
Translated title of the contribution | Decreasing the value of the cell potential using nPt/C|Ti and RuO2|Ti as cathodes in a reactor for electro leaching of electronic E-waste |
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Original language | English |
Article number | Cat1852 |
Journal | Revista Mexicana de Ingeniera Quimica |
Volume | 20 |
Issue number | 3 |
DOIs | |
State | Published - 2021 |
Externally published | Yes |
Keywords
- E-waste
- Electro-leaching
- Hydrogen evolution reaction
- Nanoparticles
- Reactor-design