Abstract
NiFe2O4 ceramic based inert anodes were fabricated by a two-step cold-pressing sintering process. The bubble behavior of NiFe2O4 ceramic based inert anodes was investigated in a two-compartment see-through quartz cell. Anodic overvoltage and potential decay curves on the inert anodes were measured by using the steady state and current interruption technique. The results show that the electrolytic gas evolution for NiFe2O4 inert anodes, including bubble nucleation, growth, coalescence, growth again, migration and escaping, lasts for 79s and the escaping bubble size is about of Φ4mm×2mm. While gas evolution lasts for 102s of carbon anodes with larger releasing bubbles. When current densities are 0.6, 0.8, 1.0 and 1.2A/cm2, the anodic overvoltage of NiFe2O4 anodes are 0.189 V, 0.270 V, 0.309 V and 0.359 V, respectively. After adding small amount of MnO2, V2O5, and TiO2, a minor reduction in anodic overvoltage of NiFe2O4 anodes can be obtained.
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