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Design novel solid oxide electrolyte with enhanced ionic conductivity formsone of the Holy Grails in the field of materials science due to its greatpotential for wide range of energy applications. Conventional solid oxideelectrolyte typically requires elevated temperature to activate the ionictransportation, while it has been increasing research interests to reduce theoperating temperature due to the associated scientific and technologicalimportance. Here, we report a conceptually new solid oxide electrolyte,HSrCoO2.5, which shows an exceptional enhanced proton conductivity at lowtemperature region (from room temperature to 140 oC). Combining both theexperimental results and corresponding first-principles calculations, weattribute these intriguing properties to the extremely-high protonconcentration as well as the well-ordered oxygen vacancy channels inheritedfrom the novel crystalline structure of HSrCoO2.5. This result provides a newstrategy to design novel solid oxide electrolyte with excellent protonconductivity for wide ranges of energy-related applications.

A protonated brownmillerite electrolyte for superior low-temperature proton conductivity