电还原镉-壳聚糖杂化材料修饰电极的制备及表征

本文利用壳聚糖（CHT）对镉离子的吸附性能并结合电化学还原法在玻碳电极（GCE）表面制备了还原态镉-壳聚糖（rCd-CHT）有机-无机杂化材料.以K3Fe（CN）6为电化学活性探针对修饰电极的电化学性能进行了循环伏安（CV）和交流阻抗（EIS）表征,结果表明rCd-CHT能大大提高该修饰电极的有效表面积,增大K3Fe（CN）6在修饰电极表面的异相电子转移速率（k0）.将不同修饰电极用于抗坏血酸（AA）的电化学检测,结果显示,AA在rCd-CHT/GCE上的氧化峰电流值（Ipa）较裸GCE和CHT/GCE分别增大了1.4和2.1倍,表明rCd-CHT/GCE修饰电极对AA具有良好的电催化氧化作用.

Preparation and Characterization of Electrochemically Reduced Cadmium-chitosan Hybrid Modified Electrode

In this paper, based on chemical adsorption ability of chitosan （CHT） to the cadmium ions and combined with electrochemical reduction method, cadmium-chitosan （rCd-CHT） organic-inorganic hybrid material in reduced form was electrochemically prepared on a glassy carbon electrode （rCd-CHT/GCE）. Taking K3Fe（CN）6 as the electrochemical activity probe, the characterization of modified electrode electrochemical performance was made through circulation current-voltage （CV） and exchange impedance （EIS）, and the result shows that rCd-CHT can dramatically improve the modified electrode surface area effectively and increase out-of-phase electron transfer rate （k~） of K3Fe（CN）6 in the surface of the modified electrodes. Different modified electrodes were further applied for the electrochemical detection of aseorbie acid （AA）, and it was found that the oxidation peak current value of AA （Ipa） in rCd-CHT/GCE increased respectively 1.4 and 2.1 times larger than those in bare GCE and CHT/GCE, indicating that rCd-CHT modified electrode can effectively improve the electrocatalytic oxidation on the part of AA.