دانلود مقاله ISI انگلیسی شماره 133203
کد مقاله سال انتشار مقاله انگلیسی ترجمه فارسی تعداد کلمات
133203 2018 29 صفحه PDF سفارش دهید 5855 کلمه
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عنوان انگلیسی
Self-powered sensor for tannic acid exploiting visible LED light as excitation source
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : Electrochimica Acta, Volume 274, 1 June 2018, Pages 67-73

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چکیده انگلیسی

The present work describes the development of a self-powered photoelectrochemical sensor for the determination of tannic acid (TA) based on a TA-sensitized TiO2 (TA/TiO2/FTO) as photoanode and Cu2O/ZnO/FTO photocathode to water reduction. The self-powered cell was comprised of a photoanode and a photocathode separated in two chambers to generate the suitable power output under irradiation from a visible LED light driving the tannic acid sensing process. The electronic characteristics of TA/TiO2/FTO photoanode and Cu2O/ZnO/FTO photocathode were evaluated by electrochemical impedance spectroscopy. The principle of the self-powered photoelectrochemical cell is based on water reduction in the cathodic chamber on the Cu2O/ZnO/FTO photocathode while TA is oxidized in the anodic chamber to generate a cell output which depends on the concentration of TA in the anodic compartment. Under optimized conditions, the cell presented a wide linear response range for TA from 1 μmol L−1 up to 500 μmol L−1, demonstrating that the capability of the proposed system to generate power can be modulated by the TA concentration.

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