Dual‐Functional Photonic Battery Enabling Dynamic Radiative Thermal Management and Power Supply

Abstract

Abstract Dynamic thermal management materials are pivotal for advancing energy‐efficient buildings and promoting global sustainability. However, existing materials typically offer only a single‐function of temperature regulation, lacking the integrated power supply capability essential for sustaining indoor activities and building sustainability, particularly in the face of frequent power outages. A photonic battery that combines all‐season dynamic radiative thermoregulation with electrical power supply in a single silicon‐based unit is demonstrated. This device delivers dual functionality with high infrared emissivity regulation (0.53 at 8–13 µm) and superior energy storage performance, featuring a high specific capacity (≈3271 mAh g −1 ), areal capacity (≈0.38 mAh cm −2 ), and efficient energy recycling (71.6%). A reversible ion‐interaction‐induced phase change mechanism, enabling continuous and non‐volatile electro‐optical‐thermal transformation and significant infrared tunability, is proposed. Our simulations indicate that the implementation of these dynamic materials into buildings could significantly reduce energy consumption by up to 18.4%, equating to 544.8 GJ, and achieve an annual reduction in CO 2 emissions of 124.1 tons. This work paves the way for the development of energy‐saving electro‐driven dynamic materials, marking a significant step forward in global sustainability initiatives.