基于纳米铂/碳纤维纸复合电极的甲醛电化学传感器

Electrochemical Sensor of Formaldehyde Based on Platinum Nanoparticles/Carbon Fiber Paper Composite Electrode

以处理过的碳纤维纸代替标准电极材料作为基底,在聚邻苯二酚膜修饰的碳纤维纸上进行纳米铂的电化学沉积来制备新型的纳米铂/碳纤维纸复合电极,并以该复合电极作为甲醛的电化学传感器,用循环伏安法（Cv）研究了甲醛在该复合电极上的电化学行为,优化了实验条件。研究表明：该复合电极对甲醛的电催化氧化明显优于标准铂电极,电化学响应显著;在酸性介质的循环伏安分析中,该电极对于甲醛氧化峰电流与甲醛浓度呈良好的线性关系,其氧化峰电流与甲醛浓度在5100mg/L范围内成线性关系,检出限为3.3mg/L。该研究工作为研发简单易行、成本低的新型甲醛电化学传感器奠定了良好的基础。

The novel platinum nanoparticles /carbon fiber paper composite electrode was prepared,as theheat-treated carbon paper being the bottom base instead of standard electrode materials, through electro-chemical deposit of platinum nanoparticles on carbon fiber paper modified by poly catechol film. The com-posite electrode was taken as the electrochemical sensor of formaldehyde. The composite electrode wascharacterized by SEM. The electrochemical behavior of formaldehyde on the composite electrode was re-searched with Cv （Cyclic voltammograms） method under optimized experimental eonditions. The experi-ment showed that the composite electrode presented much stronger electrochemical responses to the cata-lytic electro-oxidation of form formaldehyde than standard platinum electrode, the electrochemical responsewas obvious. In the Cv analysis of acidic solutions, the oxidation peak current was linearly proportional toformaldehyde concentration over the range of 5-100 mg/L in acidic solutions,the detection limit of form-aldehyde was 3.3 mg/L. The above research work laid down a good foundation to research anode materialsof methanol fuel cell and simple low cost formaldehyde electrochemical gas sensor.