CO2 is a nice substance for this due to its relatively high temperature of fusion at modest pressures (and cheap ubiquity). I’d wondered why this wasn’t more of a thing with air, using excess energy to liquefy it, to later let the LN2 to be vaporized/expanded in a turbine and the LOX to be used in rockets or something. Or maybe use excess power to electrolyze water for fuel cell use later.

But yeah, CO2 makes a lot of sense despite its relatively poorer specific heat ratio for adiabatic expansion compared to mono and diatomic gasses.