Interpreting macroscale conductivity behavior of ceria-based oxides via nanoscale quantification of grain boundaries
Non-stoichiometric oxides, which exhibit advantageous electronic and ionic conductivity, are key components in a number of technologically relevant areas including gas separators, solid oxide fuel cells and electrolysis cells. Grain boundaries dramatically limit the charge transport and therefore the overall efficiency of these devices. The limited conductivity is typically attributed to composition and chemistry changes only a few nanometers from these interfaces, due to the different defect formation energies at grain boundaries compared to the bulk. In the following, macroscopic electrical ...
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