▎ 摘　　要

Dynamically modulating the infrared emissivity of materials is of great importance in various appli-cations (e.g., thermal camouflage and radiative cooling). Even though graphene-based materials (such as multilayer graphene, MLG) have shown great potential in active control of emissivity, the device lifetime is rather short, while low-cost large-scale production is difficult to achieve. Herein, graphene aerogels (GAs) with high porosity are prepared by a simple hydrothermal method, and used as electrode in an infrared emissivity modulator with a sandwiched structure. It is demonstrated that the emissivity of GA can be tuned through ion intercalation by electrostatic gating. The modulation depth of GA is compara-ble to that of MLG, but device lifetime is much longer. This is likely due to the porous structure of GA formed by a continuous three-dimensional MLG network, which makes it easier for ion transport, while allowing effective charge transfer from anions adsorbed on or intercalated into MLG to carbons. Due to a change in surface roughness of GA upon compressing, the emissivity of GA can be further tuned by compressive strain, which provides additional freedom in control of emissivity. The observations offer a promising avenue for the preparation of large-scale emissivity modulators at low cost, which is beneficial for practical applications.