“…Several procedures for the electrode surface modification have been introduced, with the aim of electrocatalyzing the AA oxidation. Polyvinylferrocene film covalently bound to carbon electrode [23], ferrocene [24,31,34], polyglycine film [28], metal-dispersed porous carbon films [26], 7,7,8,8-tetracyanoquinodimethane (TCNQ) [25], tetrathiafulvalene [27], cobaltsalen [32], 2,6-dichlorophenolindophenol [20], pyrocatechol sulfonephtlalein [29] layers were shown to decrease the overpotential of AA oxidation. In two papers, nanoclusters physically bound to the electrode surfaces have been employed as catalysts of AA oxidation.…”