2011 Volume 79 Issue 6 Pages 450-452
An ammonia gas sensor was fabricated using Al3+ ion conducting (Al0.2Zr0.8)20/19Nb(PO4)3 solid electrolyte with NH4+-β-gallate (NH4+-Ga11O17) as the auxiliary sensing electrode and its performance in humid atmosphere was investigated. The sensor exhibited advanced sensing performance than previously reported NH3 gas sensors with a continuous, quantitative and reproducible response that obeys the theoretical Nernst relationship even in a highly humidified atmosphere containing 4.2 vol % H2O at 230°C. Therefore, the proposed sensor with NH4+-β-gallate auxiliary sensing electrode is expected to be a suitable candidate for application as a practical on-site NH3 gas detecting tool.