Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 30, Issue -, Pages 34-37Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2013.01.024
Keywords
Falling region; Tuning formal potential; Design best catalyst; Surface redox catalysis
Categories
Funding
- Fondecyt [1100773, 3130538]
- Nucleo Milenio de Ingenieria Molecular [P07-006-F]
Ask authors/readers for more resources
In classical volcano correlations in electrocatalysis, the shape of (log i(o)) plots versus the binding energy of the reactant to active sites, the maximum activity is associated to a situation where the surface coverage of reactant species is equal to 0.5 corresponding to a free energy of adsorption of the reactant equal to zero. When studying electrochemical reactions catalysed by macrocyclic transition metal complexes adsorbed on graphite electrodes, volcano correlations are found when plotting the activity versus the formal potential of the catalyst for several reactions, assuming that the formal potential is somehow related to the free energy of the adsorption of the reacting molecule. In this work we offer an interpretation different from that given in the literature for these correlations for the electrooxidation of hydrazine. The highest catalytic activity is achieved when the formal potential of the catalyst approaches the N2H4/N-2 reversible potential. In contrast, if log i (normalized for the actual surface concentrations of Fe(II) active sites at constant potential) is plotted versus the difference between the Fe(II)/(I) formal potential of the catalysts and the standard potential of the N2H4/N-2 reaction, the correlation is linear with a slope close to 2RT/F. (C) 2013 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available