室温高聚物电解质氢催化传感器

Hydrogen catalytic sensor based on SPE at room temperature

分别采用混合压膜法和浸渍还原原位化学沉积法 ,以Pd为催化剂 ,高聚物质子导体Nafion膜为电解质 ,研制复合膜电极构成两种不同的室温固态电解质催化氢传感器。探索出以Pd盐自制Pd黑和浸渍还原制备膜电极的工艺条件 ,考察了一些因素对传感性能的影响 。

A novel catalytic electrochemical hydrogen sensor which consists of solid polymer electrode (SPE) and catalytic active electrode workable at room temperature was studied and fabricated. Nafion is often utilized as polymer proton conductivity membrane to which a catalytic electrode was bonded from Pd black mixed with graphite and Teflon by the mixture-pressing method and in situ impregnation reduction (I-R) technique. In this work, the active catalyst of Pd black for hydrogen oxidation was selected and prepared from PdCl2, the I-R deposition procedure were modified to optimize structure parameters for hydrogen sensor and improve the metal utilization so that electrode loading can be reduced without loss of electrochemical performance. The hydrogen sensing characteristic with air as reference gas was examined. The experimental results show that the sensor keeps good sensing character at room temperature.