An Electro‐Driven Dynamic and Multicolored Radiative Thermal Regulation Material for All‐Year‐Round Building Energy Saving

Abstract

Rational dynamic thermal regulation of both solar and thermal regions is of significant importance for building energy saving. In this work, an electro‐driven dynamic radiative thermal regulation material (EDRTRM) capable of switching the thermal regulation capacity between the heating, white cooling, and multicolored cooling (blue, green, and yellow) modes is designed. These multi‐modes with high thermal regulation power and color variation are achieved through a synergistic material combination involving an electrochromism of Prussian blue (PB) and the electrodeposition of copper (Cu) with a polyformaldehyde (POM)‐based mid‐infrared (MIR) emitter. Optical characterization confirmed the superior spectral performance of materials, with a remarkable modulation capability of power density up to 659 W m−2, indicating an exceptional heating and cooling performance, which is evidenced by a temperature modulation difference of up to 11 °C. Notably, the EDRTRM under a multi‐colored cooling mode also achieves a temperature reduction of ≈ 4–6 °C. The EnergyPlus simulations demonstrate that the EDRTRM can save a huge amount of energy consumption of 16.56 MJ m−2 in cities with seasonal temperature variations such as Beijing. This dual‐functional design not only maximizes thermal regulation capabilities but also satisfies aesthetic requirements, showcasing its potential for widespread practical application.