In the last 20 years, boron-doped diamond (BDD) electrodes have been progressively more used in electrochemistry, especially as anodes in environmental electrochemistry and as sensors in electroanalytical chemistry. These electrodes have called attention especially because they present several interesting characteristics comparatively to other electrode materials (even other varieties of advanced carbon materials), foremost the following, mostly from the electroanalytical point of view: low and stable background current, wide potential window between the regions of reduction and oxidation of water, good signal repeatability for many redox species, and weak adsorption of polar molecules on the electrode surface. However, in many cases, the electrochemical activity toward a specific redox species can be affected by the type of surface termination on the BDD electrode (predominantly hydrogen or not, then involving different oxygen groups). In aqueous medium, the type of surface termination can be changed electrochemically through the hydrogen evolution reaction or the oxygen evolution reaction. Hence, by means of different techniques (electrochemical, XPS etc.), we intend to investigate the effect of different types of polarization, anodic and cathodic, on the extension and composition of the BDD surface terminations. Once this effect is understood, we intend to investigate the influence of distinct types and contents of BDD surface terminations on its electrochemical activity toward different redox species in aqueous solution, when, if possible, new electroanalytical methods will be developed for the determination of these species. Furthermore, we intend to look for possible correlations between electrochemical activities, physico-chemical properties of the molecules, and the superficial states of the BBD electrode.
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