Algae-inspired multifunctional ocean solar-energy conversion chain enabled by coordination polymers

Summary Ocean solar energy is important for underwater devices. However, the intermittent irradiation and the requirements of many accompanying functional parts make the related devices huge and expensive. It is still a challenge to realize an all-in-one solar-energy conversion platform that can provide a continuous power supply, seawater sensing, and environment restoration simultaneously. Here, we demonstrate an algae-inspired strategy to achieve a multiple-function, ocean solar-energy conversion chain. Specifically, Prussian blue analogs (PBAs) of coordination polymers serve as a robust transshipment depot to connect a photon-driven oxygen-evolution part, with other components enabling the underwater system to produce electricity and oxygen for low-oxygen-zone restoration, to supply continuous day and night electricity, and to sense seawater in authentic seawater. The stability of the system is demonstrated for more than 100 day-night cycles. The concept presented here highlights the prospect of using ocean solar energy to achieve multiple tasks with an all-in-one platform.