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) 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.

本工作介绍了一种基于TA敏化的TiO ₂（TA / TiO ₂）作为光阳极和Cu ₂ O / ZnO / FTO光电还原法测定单宁酸（TA）的自供电光电化学传感器的开发。。自供电电池由在两个腔室中分隔开的光电阳极和光电阴极组成，以在驱动单宁酸传感过程的可见LED光线照射下产生合适的功率输出。TA / TiO ₂ / FTO光电阳极和Cu ₂的电子特性通过电化学阻抗谱评价O / ZnO / FTO光电阴极。自供电光电化学电池的原理是基于在Cu ₂ O / ZnO / FTO光阴极上阴极室中的水还原，而TA在阳极室中被氧化以产生取决于阴极中TA浓度的电池输出。阳极室。在优化的条件下，该电池对TA的线性响应范围很宽，从1μmolL ^-1到500μmolL ^-1，表明拟议系统发电的能力可以通过TA浓度进行调节。