氧化钨pH电化学传感器的H^+响应行为研究

Study of the H^+ Response Behavior of WO_3-Based pH Electrochemical Sensor

采用WO3作为H+响应敏感材料,制备了WO3pH电化学传感器,对传感器的H+响应行为,如响应范围、响应灵敏度、响应时间等影响因素进行了分析。制备WO3工作电极的热处理温度对传感器的H+响应灵敏度与速度有影响,H+响应速度与溶液pH和温度有关,溶液中Na+,K+,F-对H+响应行为没有影响,但是受到I-,NO3-的干扰。

A pH eletrochemical sensor was prepared with a WO3-based working electrode, and the H^＋ response behavior of the sensor was investigated, such as pH response range, response sensitivity, response time. The response behavior is mostly effected by the heat-treatment process of the WO3 electrode, while it is also effected by the solution temperature and pH value. The influence of interfered ions was also studied. The result shows that the response of the eletrochemical sensor is not interfered by Na^＋ ,K^＋ ,F^- ,but by I^- , NO^-3.