纳米铁氰化镍修饰铝电极对抗坏血酸的电催化氧化

Electrocatalytic Oxidation of Ascorbic Acid on the Al Electrode Modified with Nano-sized Nickel Hexacyanoferrate

利用多孔阳极氧化铝作模板,用化学修饰方法在铝基体上制备了纳米铁氰化镍修饰电极。研究了修饰电极的电化学特征及其电催化氧化抗坏血酸的行为。结果表明,纳米铁氰化镍修饰铝电极的循环伏安图上呈现一对可逆氧化还原峰。检测抗坏血酸,纳米铁氰化镍修饰铝电极比铁氰化镍修饰铝电极有更高的灵敏度。用安培法测定抗坏血酸,线性范围为1×10-6～1.5×10-2mol/L,检出限为2.4×10-7mol/L。本方法应用于实际样品中抗坏血酸的检测,结果令人满意。

Nano-nickel hexacyanoferrate modified A1 electrodes （Nano-NiHCF/A1） were fabricated by elec- troless dipping method using porous anodic alumina as template and their electrochemical characteristics and electrocatalytic oxidation of ascorbic acid （AA） were studied. The cyclic voltammogram of the nano-NiHCF/A1 electrodes shows a well-behaved redox couple. The nano-NiHCF/A1 electrode shows higher current sensitivity towards the oxidation of AA than that of the bulk NiHCF/A1 electrode. The calibration plot is linear over the AA concentration in the range of 1 x 10^-6 - 1.5 x 10^-2 mol/L using amperometric method. The detection lim- it of the ampeorometric method is 2.4 x 10^-7 mol/L. The presented method was used for the determination of AA in fresh fruit and vegetable juices , and the results were satisfactory.