Which mechanism causes increased electrical conductivity in doped barium cerate when exposed to humidified hydrogen?

💡 Explanation

When barium cerate is exposed to humidified hydrogen, proton hopping occurs because hydrogen disassociates on the surface, and the protons incorporate into oxygen vacancies in the perovskite lattice, enabling proton conduction. Therefore boosted conductivity results, rather than others which imply alternative doping or phase changes.

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