Abstract
In this work, the non-existent sulfide auxiliary electrode coating for sulfur sensor was developed by infiltration of Ca2+ and Al3+ corresponding to the nominal compositions CaAl2O4 and CaAl4O7 into porous ZrO2(MgO) backbones. Characterization of phase composition and microstructure of the synthesized auxiliary electrode indicated that the CaO-Al2O3 particles were homogenously inlaid into the ZrO2(MgO) backbone, forming well connected network and rafts. Detection of electrical properties at 750°C revealed that higher ionic conductivity was observed in the infiltrated backbone based CaO-Al2O3 auxiliary electrode (1.53 × 10−3 S·cm−1) compared to the conventional coated auxiliary electrode (0.44 × 10−3 S·cm−1). Observation of wetting behavior predicted the interfacial reaction characteristics between auxiliary electrode and molten iron, raising that the backbone based auxiliary electrode could prospectively open up a new preparation route for auxiliary electrode coating of sulfur sensor.
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