Understanding the Ni Migration in Solid Oxide Cell: A Coupled Experimental and Modeling Approach

A long-term test of 2000 h has been carried out on a typical solid oxide cell in electrolysis mode at −1 A.cm −2 and 750 °C. The 3D reconstructions the pristine aged cermet have revealed strong Ni depletion electrolyte interface. To explain this result, an electrochemical phase-field model developed to simulate migration Ni/YSZ electrode. For purpose, mechanism proposed that takes into account impact polarization wettability. In approach, it assumes interfacial energy is changed by concentration oxygen vacancies double layer. Thanks model, computed same condition than experiment complemented simulation reverse SOFC mode. good agreement with experiment, simulations interface after operation under current. On contrary, negligible redistribution very slight enrichment predicted operation. These results tend prove relevance mechanism.