Fireproof and Efficient Electrothermal Radiation Film Enabled by Photoelectrically Collaborative Modes for Extremely Cold Environments

Electrothermal radiation (ETR) films are promising for portable, energy-efficient heating in harsh environments, but current systems suffer from low efficiency and poor safety. Here, a fireproof p-AMWNTs-M ETR film with photoelectrically collaborative modes is developed, integrating an electrothermal layer with high electrothermal-radiation conversion efficiency (80%) and emissivity (0.90), along with a cross-linked MXene layer and a high-reflectance layer (0.71) for energy saving. The ETR films demonstrate an exceptional heating effect, capable of reaching comfortable temperatures above 25 °C of entire tents even in extremely cold environments at −30 °C. In addition, the photoelectric collaborative multimodal enhancing heating methods was integrated in ETR films to achieve efficient heating while saving-energy and environmental-friendly. Furthermore, it also exhibits excellent EMI shielding (∼50 dB), durability under extreme conditions, and high fire safety. This work provides a viable strategy for advanced thermal management and electromagnetic protection in extremely cold environments.