Abstract
Abstract Electrochemical behavior and properties of poly(mercaptohydroquinone)/poly(mercapto-p-benzoquinone)(SQ) films prepared on glassy carbon electrodes (GCE) by anodic polymerization of mercaptohydroquinone were examined in detail by cyclic voltammetry. Almost all hydroquinone and/or p-benzoquinone moieties in SQ films of less than ca. 100 monolayers are electroactive in acidic and neutral buffer solutions. The formal redox potential (as estimated from anodic and cathodic peak potentials) vs. solution pH plot, the slope of which is −60 mV/pH, suggests that the overall electrode reaction of SQ films is an H+/e (1:1) reaction. As to the voltammetric behavior of SQ films, the peak current decreased and the peak potential separaxtion (ΔEp) increased appreciably in unbuffered solutions as compared with those in buffered solutions. The difference of these voltammetric behaviors in unbuffered and buffered solutions increased with increasing pH. Moreover, the peak current increased and ΔEp decreased with rising solution temperature. These noticeable behaviors observed on SQ films are discussed in connection with the charge-transport mechanism within SQ films. SQ films on GCE showed good durability over a wide potential range from the hydrogen evolution potential to +1.0 V vs. SCE.
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