Synthesis of an auxiliary electrode by laser cladding coating for in-situ electrochemical sulfur sensing

Abstract

Compact auxiliary electrode layer (MgS+MgO–PSZ) was fabricated on the MgO partially stabilized zirconia (MgO–PSZ) substrates by laser powder cladding (LPC) technique. The microstructure, composition and electrochemical performance of the MgS+MgO–PSZ layer were investigated using X-ray diffraction, scanning electron microscope and electrochemical impedance spectroscopy. The result indicated that the structure of the coating was dense and uniform. Furthermore, the auxiliary electrode was found to be efficient for zirconia-based sensor by forming numerous MgS/MgO–PSZ interface that make the S/O equilibrium established effectively.