5.5.5 Highly Water Durable NH3 Gas Sensor Based on Al3+ Ion Conducting Solid Electrolyte with NH4 +-gallate

Shinji Tamura, Tsukasa Nagai & Nobuhito Imanaka
A water durable ammonia gas sensor was fabricated by combining Al3+ ion conducting solid electrolyte ((Al0.2Zr0.8)20/19Nb(PO4)3) with NH4+-beta-gallate (NH4+-Ga11O17) as the auxiliary sensing electrode and its NH3 gas sensing performance was investigated in humid atmospheres. The sensor exhibited advanced sensing performance 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. This superior sensing performance of the proposed sensor in...