Self‐Driven Cooling with Kilowatts per Square Meter Heat Flux for Outdoor Integrated Electronics

ABSTRACT Outdoor, high‐power electronic systems require efficient and deployable passive thermal management solutions. However, a single principle of thermal radiation or conduction fails to cope with both self‐driven and high heat flux demands, while unstructured material design lacks durability and cost‐effectiveness. This study proposes a cooling framework of passive thermal radiation/latent heat‐driven active heat conduction. Mechanochemistry‐mediated thermal‐enhanced fillers are sequentially embedded into the predefined heat transfer nodes within a silicone‐acrylic‐based coating, where the heterointerfaces between nano‐minerals and micro‐capsules targetedly optimize electromagnetic wave and phonon transport pathways, enabling self‐driven heat fluxes exceeding 0.5 W/cm 2 in the thermal equilibrium system, an order of magnitude enhancement. Integrated circuit heat dissipation demonstrates consistently 3°C lower temperature compared to commercial thermal greases and radiative coatings. Practically, the cost for zirconia/alumina‐reinforced silicone‐acrylic resin remains only 6.9 $/m 2 , while comprehensive environmental aging tests verify promising durability.