Charge transfer on single-crystal electrodes

Anion Adsorption and Charge Transfer on Single-Crystal Electrodes... 

Anion(s), role in boundary layer at metal-electrolyte solution interface, 126-127 Anion adsorption and charge transfer on single-crystal electrodes advantages and disadvantages, 169 anion coverages, 161,162/ ball models for adlayer structures, 161,163/ charge correction, 167,169 defects, influence on adsorption, 165,166/... 

Anion adsorption and charge transfer on single-crystal electrodes—Continued experimental procedure, 157-159 polycrystalline electrode activated by electrochemical cycling, 165,167 Pt(531) electrode, 167,168/ state of electrode surface using cyclic voltammetry, 164,165/ voltammetric profile, 158/, 160 Antigen-antibodies, use in glass surfaces, 202-209... 

And yet, at high anodic potentials (+1.7 V vs. SHE, just prior to the onset of the O2 evolution) a minor current peak is observed at potentiodynamic curves taken with polycrystalline electrodes [38, 116]. As scans were repeated, the peak current increased until it reached a steady-state value (Fig. 27). The peak is found to be more pronounced for electrodes with higher sp2-carbon content. And, vice versa, it was not observed on single crystal electrodes. The peak current still is as low as 1 pA cm 2 therefore, it would be overlooked with Fig. 7 and similar graphs. The surface redox couple that manifests itself in this manner was ascribed to the oxidation of sp2-carbon of intercrystallite boundaries. The total charge transferred, if related to oxygen bound to surface carbon sites, indicated only 0.05% of the sites participated in... 

Adsorption of acetic acid on Pt(lll) surface was studied the surface concentration data were correlated with voltammetric profiles of the Pt(lll) electrode in perchloric acid electrolyte containing 0.5 mM of CHoCOOH. It is concluded that acetic acid adsorption is associative and occurs without a significant charge transfer across the interface. Instead, the recorded currents are due to adsorption/desorption processes of hydrogen, processes which are much better resolved on Pt(lll) than on polycrystalline platinum. A classification of adsorption processes on catalytic electrodes and atmospheric methods of preparation of single crystal electrodes are discussed. 

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