High Performance Ammonia Sensor Based on Solid Electrolyte

The Sensor output variation with the NH_3 content at 225 C for the reference electrode （a） Pr_2（S0_4）_3·（NH_4） _2S0_4 and （b） Nd_2（S0_4）_3·（NH_4）_2S0_4， respectively，该操作温度被设定为温度，即硫酸盐应用于参考电极成为氢离子中的传感器输出之间的关系。氨酰胺气体压力显示直线和直线的确切斜率与从Nernst equation中获得的值的斜率计算，如果测试气体大气层中的浓度实际上与参考电极部分中的氨含量相同，传感器的输出可能是零。the ammonia concentration in both the Pr_2（S0_4）_3·（NH_4）_2S0_4 and the Nd_2（S0_4）_3·（NH_4）_2S0_4 reference electrode componartment can be precisely estimated to be approximately 3 ppm。NH_3传感器由NH_4^+离子处理固态电极和稀有地球氨基硫酸盐作为参考电极演示以响应NH_3气体集中实际上与Nernst关系的连续性，快速和可复制的反应：传感器定量NH_3检测的突出特点，为识别有毒氨气体泄漏站点和良好的位置监测氨含量的情况提供了很大的帮助。

The sensor output variation with the NH_3 content at 225ﾟC for the reference electrode (a) Pr_2(S0_4)_3・(NH_4) _2S0_4 and (b) Nd_2(S0_4)_3・(NH_4)_2S0_4, respectively, were measured.The operating temperature was set as the temperature where the sulfates applied in the reference electrode become anhydrous.The relation between the sensor output and the logarithm of ammonia gas pressure shows a straight line and the slope of the line exactly coincides with the slope calculated from the value obtained from the Nernst equation.If the concentration in the test gas atmosphere is exactly the same with the ammonia content in the reference electrode compartment, the sensor's output becomes zero.From the figure, the ammonia concentration in both the Pr_2(S0_4)_3・(NH_4)_2S0_4 and the Nd_2(S0_4)_3・(NH_4)_2S0_4 reference electrode compartment can be precisely estimated to be approximately 3 ppm.In conclusion, the compact NH_3 sensor composed of the NH_4^+ ion conducting solid electrolyte and the rare earth ammonium sulfate as the reference electrode was demonstrated to respond the NH_3 gas concentration exactly to the Nernst relation with continuous, rapid and reproducible responses.The outstanding feature of the sensor's quantitative NH_3 detection, contributes greatly to identifying the toxic ammonia gas leakage site as well as in situ monitoring of the ammonia content.