This release, in Fahrenheit, is suggesting how to store energy when it is cold. They are looking at Mars, to reduce rover heating (and energy) requirements at night.
DOI 10.1021/acs.nanolett.0c04780 has an abstract that gives the Centigrade. But I prefer Kelvin: 200 K.
As anywhere else goes, I am unsure. Most space craft are rarely in shade for long, so don't need much in capacitance anyway. Statites in umbra (like Venus') will get this low; so would craft beyond that 2.5 AU snowline (e.g. Ceres).
However any craft in vacuum is also a candidate for nuclear power, whose energy becomes heat by thermodynamics. In vacuum is no atmosphere to carry heat away: see all those radiators on the Space Station? And don't talk to me about wormholes.
As for the (few) atmospheric worlds near here, Titan (which really is not near here) might still be too cold at 90 K. I more wonder about high-atmo floaters on Venus' night side. Also the Moon: power storage for rovers on night-missions.
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