ABSTRACT
CV has yielded valuable information concerning the surface properties of electrodes modified chemically by immobilization of electrochemically reactive compounds. Self-assembled monolayers as well as Langmuir-Blodgett films were of particular interest for exploring potentiodynamic relative to development of electrochemical sensors or metal protection. Characterization of spontaneously adsorbed redox-active films by CV provided convenient approaches for tailoring the electronic structure of the metal-organic interface[292,293] and for observing the electrostatic interactions developed in the interfacial region.[294] Important information has been revealed concerning the effect of the end group charge on the electrochemical response,[295-298] the oxidative adsorption of n-alkanethiolates,[299] as well as their reductive desorption.[300-302] CV was applied to probe LangmuirBlodgett monolayer modified electrodes,[303-305] contributing to an understanding of their structure, stability, and reactivity.[306-310]
To achieve high-performance methanol fuel cell electrodes, the use of a variety of electrodes modified chemically by metal deposition has been proposed based on the CV investigations of surface properties. Thin layers of various carbon powders and recast Nafion® electrochemically plated with platinum[311] and carbonsupported catalysts of Pt, Pt/Ru, Pt/RuAV, and Pt/Ru/ Pd,[312] Pt and Ru microparticles dispersed on poly-N-methylpyrrole conducting polymer[313] were evaluated by CV for the methanol electrooxidation. CV investigations revealed improved performances due to electrodeposition of transition metals on carbon,[314] glassy carbon,[315] graphite,[316] and boron-doped nanoporous, honeycomb diamond film electrodes[317] for various catalytic reactions.
