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通过循环伏安的电化学方法在金属钛基体上先后进行苯胺的聚合和金属铂的电化学沉积,得到以金属钛为基体的聚苯胺载铂电极(Pt/PAn/Ti),并通过扫描电镜和循环伏安法对该电极进行了表征。通过研究甲醛在该电极上的电催化氧化行为,考察了载铂量对甲醛氧化效果的影响及PAn在电催化氧化甲醛的过程中所起的作用。结果表明,载铂量与甲醛的氧化有一定的关系,PAn的存在使得铂微粒分散程度更好,有效面积更大,与相同铂沉积量的Pt/Ti电极相比,甲醛在其上的正向扫描氧化峰电流密度增加了2.3倍,电位负移了40mV;反向扫描氧化峰电流密度增加了5倍,电位负移了30mV。同时,PAn的存在也增强了电极的抗中毒能力。
Polyaniline-supported platinum electrode (Pt / PAn / Ti) was prepared by cyclic voltammetry electrochemical polymerization of aniline and electrochemical deposition of metallic platinum on a metallic titanium substrate. The scanning electron microscopy The electrode was characterized by cyclic voltammetry. By studying the electrocatalytic oxidation of formaldehyde on the electrode, the effect of the amount of platinum on the oxidation of formaldehyde and the role of PAn in the electrocatalytic oxidation of formaldehyde were investigated. The results showed that the amount of supported platinum and formaldehyde oxidation have a certain relationship, the presence of PAn platinum particles make a better degree of dispersion, the effective area is larger, with the same amount of Pt deposition of Pt / Ti electrode, the formaldehyde in the positive The current density toward the scan peak increased by 2.3 times and the potential was shifted by 40mV. The current density of reverse scan oxidation peak increased by 5 times and the potential was shifted by 30mV. At the same time, the presence of PAn also enhances the resistance of the electrode to poisoning.