Abstract
Carbon dioxide sensing performance of gas sensors using a NASICON (Na 3Zr 2Si 2PO 12) solid electrolyte and a Li 2CO 3-based auxiliary phase was examined. Gradual changes (drifts) in the EMF level with time were observed for the sensor using only Li 2CO 3 as an auxiliary electrode. A new auxiliary electrode material based on Li 2CO 3 and Nd 2O 3 was developed to improve the sensing stability. The mixture of Li 2CO 3 and Nd 2O 2+2 x (CO 3) 1− x Li 2 x was stable to humidity. The Nd 2O 2+2 x (CO 3) 1− x Li 2 x phase between an auxiliary electrode and NASICON acted as a stable diffusion boundary layer. For the mixture of Na 2CO 3 and Nd 2O 3, a similar treatment induced formation of only Nd 2O 2CO 3. A higher reactivity of the Li + ions with Nd 2O 2CO 3 and a lower reactivity of the Na + ions effectively stabilized the diffusion boundary layer.
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