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Energy harvesting from sun and outer space using thermoradiative devices(TRD), despite being promising renewable energy sources, are limited only todaytime and nighttime period, respectively. A system with 24-hour continuousenergy generation remains an open question thus far. Here, we propose aTRD-based power generator that harvests solar energy via concentrated solarirradiation during daytime and via thermal infrared emission towards the outerspace at nighttime, thus achieving the much sought-after 24-hour electricalpower generation. We develop a rigorous thermodynamical model to investigatethe performance characteristics, parametric optimum design, and the role ofvarious energy loss mechanisms. Our model predicts that the TRD-based systemyields a peak efficiency of 12.6\% at daytime and a maximum power density of10.8 Wm$^{-2}$ at nighttime, thus significantly outperforming the state-of-artrecord-setting thermoelectric generator. These findings reveal the potential ofTRD towards 24-hour electricity generation and future renewable energytechnology.

Designing 24-hour Electrical Power Generator: Thermoradiative Device for Harvesting Energy from Sun and Outer Space