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Solid oxide fuel cells

Cool proton conductors

Achieving high ionic conductivity at close to room temperature in solid oxide electrolytes is challenging due to the large thermal activation needed for ion transport. Now, a hydrogen-intercalated brownmillerite oxide, SrCoO2.5, has been shown to function as a high-performance proton conducting electrolyte for fuel cells below 200°C.

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Fig. 1: Hydrogenated brownmillerite SrCoO2.5 as a low temperature fuel cell electrolyte.


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Correspondence to Shriram Ramanathan.

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The authors declare no competing interests.

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Bisht, R.S., Ramanathan, S. Cool proton conductors. Nat Energy 7, 1124–1125 (2022).

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