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Green catalyst for ORR in Ecological Metal-Air batteries.pdf (475.56 kB)

“Green” Catalyst for the Oxygen Reduction Reaction in Ecological Metal-Air Systems

submitted on 09.06.2020, 20:19 and posted on 12.06.2020, 05:30 by Iliyan Popov, Krum Banov, Yovka Milusheva, Reneta Boukoureshtlieva, Toma Stankulov, Todor Petkov, Tanja Vidaković-Koch, Branimir Banov

Thermally treated caffeine doped active carbon (Caffeine-Norit) is studied as a catalyst for the oxygen reduction reaction (ORR) with application in metal-air systems and neutral aqueous electrolytes. Catalytic activity is characterized by polarization curves and Tafel plots and the results are compared with 5% Platinum (5% Pt-Norit) and 4% Silver (4% Ag-Norit) catalysts. The Tafel slopes of all three catalysts are the same, the activity of Ag-Norit being somewhat smaller then both Caffeine-Norit and Pt-Norit. The polarization curves are also comparable, especially in the low current density region. The increase of overpotential for the Caffeine-Norit at current density higher than 50 mA cm-2 is due to accumulation of H2O2 in the catalyst layer. This was demonstrated by using a simple method for detection of peroxides in neutral electrolytes based on indigo carmine indicator.


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Institute of Electrochemistry and Energy Systems



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