Use of model Pt(111) single crystal electrodes under HMRDE configuration to study the redox mechanism for charge injection at aromatic/metal interfaces.
The electrochemical reactivity of hydroquinone-derived, catechol-derived and benzene-derived adlayers is compared at Pt(111) single-crystal surfaces (i) under stagnant hanging meniscus (HM) configuration and (ii) under hydrodynamic conditions imposed by combining the HM configuration with the rotating disk electrode (RDE) that merge in the so-called HMRDE technique. For the three cases studied, the results suggest that reductive desorption of the adlayers can be accomplished in aqueous 0.5 M H(2)SO(4) solutions within the time frame of a single cathodic scan, i.e. the first half of a single CV experiment. The results highlight the simplicity of exploiting the hydrodynamic conditions imposed by RDE as a convenient electroanalytical strategy to elucidate controversies regarding whether desorption takes place or not during electrode processes studied under the HM configuration.
Pontifical Catholic University of Puerto Rico, Ponce, Puerto Rico.
Margarita
M
Rodríguez-López
Paulino
P
Tuñón
Juan M
JM
Feliu
Antonio
A
Aldaz
Arnaldo
A
Carrasquillo