温度和湿度对Nafion膜氢传感器性能的影响

Effects of temperature and humidity on the performance of hydrogen sensors based on the Nafion membrane

系统研究了以Nafion112膜为电解质的氢传感器在不同工作环境下的氢敏感性能.结果表明,以Nafion112膜为电解质的氢传感器对氢具有很好的敏感性,可以实现微量氢气泄漏的快速检测.该传感器在氢气体积分数为(500～3000)×10-6时的响应电压与氢气体积分数的对数呈线性关系,为标定不同环境下氢气含量与传感器响应电压的对应关系提供了依据.在相同湿度条件下,传感器响应电压随温度的升高而下降.湿度对传感器响应电压的影响与温度相关:温度较低时,响应电压随湿度的增加而下降;温度较高时,响应电压随湿度的增加而升高.

The hydrogen sensitivity of a hydrogen sensor with the Nafion112 membrane as electrolyte was studied under different working environments.The results show that the hydrogen sensor has good hydrogen sensitivity and can quickly detect a tiny hydrogen leak.The generated electromotive force increases linearly with the logarithm of hydrogen volume fraction in the range of （500 to 3000）×10-6,which provides a basis for calibrating the relationship between hydrogen content and the sensor＇s electromotive force.The electromotive force decreases with the increase in temperature under a fixed humidity condition.The effect of humidity on the sensor＇s electromotive force also relates to temperature.When the temperature is low,the electromotive force decreases with the increase in humidity;while the temperature is high,the electromotive force increases with the increase in humidity.