The Effect of Iridium Addition to Platinum on the Alcohol Electrooxidation Activity

Ozlem Sahin; Hilal Kivrak; Mustafa Karaman; Dilan Atbas

American Journal of Materials Science and Engineering. 2015, 3(1), 15-20
DOI: 10.12691/ajmse-3-1-4

Open AccessArticle

The Effect of Iridium Addition to Platinum on the Alcohol Electrooxidation Activity

Ozlem Sahin¹, Hilal Kivrak^2,, Mustafa Karaman¹ and Dilan Atbas²

¹Chemical Engineering Department, Selcuk University, Konya, Turkey

²2Chemical Engineering Department, Yüzüncü Yıl University, Van Turkey

Pub. Date: July 27, 2015

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Cite this paper:
Ozlem Sahin, Hilal Kivrak, Mustafa Karaman and Dilan Atbas. The Effect of Iridium Addition to Platinum on the Alcohol Electrooxidation Activity. American Journal of Materials Science and Engineering. 2015; 3(1):15-20. doi: 10.12691/ajmse-3-1-4

Abstract

Pt-Ir@C and Pt@C catalysts were prepared by ethylene glycol method and tested for methanol and ethanol in H₂SO₄ electrolyte. The electrocatalytic activity of these electrocatalysts was investigated using cyclic voltammograms (CVs), linear sweep voltammograms (LSVs), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS). Their CVs show that Pt₄₀Ir₆₀@C catalyst present significantly high current of methanol and ethanol oxidation compared to the other catalysts. Moreover, chronoamperometric measurements showed that the steady-state current of Pt₄₀Ir₆₀ catalyst was also higher than other electro-catalysts. EIS analysis shows that the impedances on both the imaginary and real axes are much lower than those of the other catalysts. As a result, electrocatalytic activity measurements indicated that the Pt₄₀Ir₆₀ catalyst was the most active electrode for methanol and ethanol oxidation.

Keywords:
Pt-Ir alcohol electrooxidation fuel cells CV CA impedance

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