Reconfigurable and Renewable Nano‐Micro‐Structured Plastics for Radiative Cooling

Abstract Passive radiative technology enables sustainable cooling by synchronously emitting heat and reflecting solar light without any energy consumption. However, the consumption of non‐recyclable and non‐renewable radiative materials in large quantities may eventually cause resource waste and environmental issues. Herein, reconfigurable and renewable nano‐micro‐structured plastics for future eco‐friendly and large‐scale radiative cooling applications are developed. The plastics are facilely prepared from a locally confined polymerization method, which not only enables the customization of nano/micro‐structures for thermal emission and sunlight reflection but also provides physically cross‐linked networks for damage repairing, shape reconfiguration, and recyclable usage. Compared with traditional plastics applied on electronic devices, the nano‐micro‐structured plastic achieves much higher cooling efficiency with a temperature drop of 8.6 °C on electronic circuits and 7.5 °C cooling improvements under sunlight. With the excellent cooling performance and the recycling potential, the nano‐micro‐structured plastics open an environmentally sustainable pathway to address the thermal issues encountered by electronic devices and challenges of global warming.