Activation of titanium electrodes for voltammetric detection of oxygen and hydrogen peroxide in alkaline media

Electroanalysis - Tập 9 Số 4 - Trang 273-278 - 1997
Theotis Clark1, Dennis C. Johnson1
1Department of Chemistry and Ames Laboratory, Iowa State University, Ames, IA 50011 USA

Tóm tắt

AbstractBright, freshly‐polished Ti electrodes give minimal cathodic response for O2 and H2O2 in 1.0 M NaOH. However, the response is increased gradually by repeated application of a triangular waveform within the approximate potential limits of O2 response (ca. −1.5 to −0.7 V vs. SCE). This same voltammetric pretreatment applied for excessive periods results in formation of golden films on the Ti surfaces that are active for reduction of O2 and H2O2. Levich plots of cathodic current for O2 and H2O2 at rotated golden‐Ti disk electrodes in 1.0 M NaOH (−1.35 V) are linear over a large range of rotational velocity (42 to 513 rad s−1), a behavior considered to be indicative of fast heterogeneous kinetics. Ring‐disk data demonstrate that a small amount of H2O2 is produced throughout the potential region for O2 reduction and H2O2 is concluded to be an intermediate product in the O2‐reduction mechanism. These observations are consistent with those reported previously for single‐crystal TiO2 electrodes.

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Tài liệu tham khảo

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Thông tin xuất bản

Electroanalysis

Tập 9 Số 4

273-278

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