High‐Entropy Chromate Metafabric for Broadband Infrared Radiative Cooling

Abstract

Abstract Radiative cooling, dissipating thermal energy via electromagnetic waves, is the predominant thermal management pathway for the space industry. Developing materials that combine high broadband infrared emissivity, thermal stability, and flexibility represents a desirable yet highly challenging goal. Herein, a metafabric based on high‐entropy engineering and a 1D induced shaping strategy for efficient spacecraft cooling is pioneered. Benefiting from the multiplicity absorption mechanisms and ordered structure, the engineered (La 0.2 Y 0.2 Nd 0.2 Gd 0.2 Sr 0.2 )CrO 3 exhibits inherent thermal stability and broadband infrared emissivity. Building on this feature, the developed (La 0.2 Y 0.2 Nd 0.2 Gd 0.2 Sr 0.2 )CrO 3 nanofibers demonstrate excellent spectral response and flexibility, enabled by restricted planar infrared scattering and randomly distributed amorphous regions. After weaving them into a fabric‐like architecture, the resulting metafabric demonstrates both ultra‐high emissivity within a broad IR band, flexibility, exceptional temperature resistance, and structural stability during bending. Theoretical simulations demonstrate that the metafabric exhibits additional cooling properties and a high cooling power compared to conventional cooling systems. These advancements highlight significant potential for efficient cooling in next‐generation spacecraft thermal management systems.