电流型氨气传感器的研究

通过循环伏安法、线性扫描等技术,比较了NH3在Pd,Pt,Rh,Au等不同光滑电极表面的电化学氧化行为.结果表明:Pt对NH3具有较高的催化活性,且催化产物选择性好.以化学还原法制备的超细Pt粉作为传感器工作电极催化剂,选择中性电解质作为传感器支持介质,通过工艺的改进与添加保水材料,制备出的NH3传感器工作性能稳定,测试结果准确性、重现性好,灵敏度高,传感器响应信号与被测气体浓度呈现良好的线性关系.

Study of amperometric ammonia sensor

By cyclic voltammetry of linear sweep voltammetry,the electrochemical oxidation characteristics of ammonia were compared on different smooth eletrode including Pd,Pt,Rh,Au.It was found that platinum has excellent activation and good selectivity aiming at the electrochemical oxidation of ammonia.The nanoplatinum synthesized with redox method worked as catalysis of sensor and neutral electrolyte worked as support medium of the sensor.By the improvement of technics and addition of new materials,ammonia gas sensor exhibits good characteristics in stability,accuracy,recurrence sensitivity and linearity.