Dynamic impedance studies of ethanol oxidation at polycrystalline Pt

作者：Tremblay M L; Guay D; Lasia A^*

来源：Bulgarian Chemical Communications, 2012, 44(4): 333-337.

• Ethanol oxidation
• Platinum electrode
• Dynamic electrochemical impedance spectroscopy
• Instabilities in cyclic voltammetry
• Negative charge transfer resistances
• Double-layer capacitance

Ethanol oxidation in sulfuric acid solutions was studied at polycrystalline Pt electrode using cyclic voltammetry and dynamic electrochemical impedance spectroscopy (DEIS). It was found that negative resistances appear in the vicinity of the voltammetric peak causing instabilities (saddle-node bifurcation) and sharp peaks on the voltammograms. At the least positive potentials some H UPD takes place but the capacitance drops quickly at more positive potentials due to strong adsorption of EtOH fragments and CO. At the foot of the voltammetric peak log R-ct is a linear function of the potential with the slope of -0.143 V dec(-1).

• 出版日期2012