Reaction engineering figures of meritconversion, selectivity and yieldshowed ethane conversion and ethylene selectivity were directly and inversely proportional, respectively to cell current density regardless of the catalyst used (Figure and Table ). This can be explained by the higher flux of oxide ions through the electrolyte with increased current ; thus, the ethane could potentially react with the perovskite's lattice oxygen (via oxidative dehydrogenation) to generate ethylene and also react with additional oxygen species transported due to the current (via oxidation), to generate CO and CO2. These additional oxygen species could be oxide ions or recoupled oxide ions that form gaseous oxygen. In the case of LFO, although there is a higher flux of oxide ions at the higher current densities, ethane conversion is much lower. This could be due to the LFO morphology, as explained in subsequent paragraphs, but also due to LaFeO3- oxygen vacancy formation associated with the material's oxygen storage capacity (Equation ( )) .