title: Development of electrolyte-free ozone sensors using boron-doped diamond electrodes.
abstract: The electrochemical detection of dissolved ozone in water was examined using boron-doped diamond (BDD) electrodes. A well-defined reduction peak was observed at ~380 mV for H-terminated BDD, whereas it was observed at ~200 mV in the case of O-terminated BDD for an ozone solution in a 0.1 M phosphate buffer solution at pH 7. The peak potential for ozone reduction was selective with respect to oxygen reduction at both H- and O-terminated BDD electrodes, whereas it occurred at approximately the same potential as oxygen reduction at other types of solid electrodes, including glassy-carbon, platinum, and gold electrodes. Interference from chlorine was not observed in lower concentration than 300 μM ClO(-). Furthermore, in order to apply the detection technique to electrolyte-free media, BDD microelectrodes were also used. A linear calibration curve for dissolved ozone in water could be achieved between concentrations of 0.49 and 740 μM, with an estimated detection limit (S/N = 3) of 0.185 μM (S/N = 3). Excellent stability was demonstrated for repetitions of these calibration curves performed in 3 consecutive days.
authors.affiliation: Department of Chemistry, Keio University, 3-14-1 Hiyoshi, Yokohama, Japan.
authors.forename: Yuya
authors.initials: Y
authors.lastname: Ishii
authors.forename: Tribidasari A
authors.initials: TA
authors.lastname: Ivandini
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Murata
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Einaga
mesh_terms: D001895:Boron / Q000737:chemistry*; D055664:Electrochemical Techniques; D004566:Electrodes; D010126:Ozone / Q000032:analysis*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D010126:Ozone; D001895:Boron