Cox J A, Lewinski K
Department of Chemistry, Miami University, Oxford, OH 45056 U.S.A.
Talanta. 1993 Dec;40(12):1911-5. doi: 10.1016/0039-9140(93)80115-8.
Either an iridium electrode that was anodically pretreated or a glassy carbon electrode that was coated with a film that contained iridium oxide promoted the oxidation of hydrogen peroxide. With flow injection methodology, linear calibration curves were obtained over the 2 x 10(-5) -3.6 x 10-8M range with 0.1M KOH as the carrier. With solutions of pH 11, oxidation occurred at applied potentials of near 0.0 V vs. SCE, which is much lower than potentials needed at bare Pt or glassy carbon. The low overpotential suggests applications to systems where oxidation of other species limits the use of bare electrodes. Cyclic voltammetric studies show that HO(2)(-) is the electroactive species and that catalysis rather than mediation promotes the charge transfer. Dissolved oxygen does not interfere with the measurement.
经过阳极预处理的铱电极或涂有含氧化铱薄膜的玻碳电极均可促进过氧化氢的氧化。采用流动注射法，以0.1M KOH为载流剂，在2×10⁻⁵ - 3.6×10⁻⁸M范围内获得了线性校准曲线。在pH值为11的溶液中，相对于饱和甘汞电极（SCE），在接近0.0 V的外加电位下发生氧化，这远低于裸铂或玻碳电极所需的电位。低过电位表明该方法适用于其他物质的氧化限制裸电极使用的系统。循环伏安研究表明，HO₂⁻是电活性物质，催化而非介导促进了电荷转移。溶解氧不干扰测量。
