Programming Bidirectional Heat Flow and Salt Pathways via a Symmetric Arc‐Modulated Aerogel for Stable Solar Evaporation

The practical application of solar‐driven interfacial evaporation (SDIE) is fundamentally challenged by inefficient heat distribution and salt accumulation. This work introduces an Arc‐Modulated Block Geometry (AMBG) aerogel evaporator that overcomes these limitations through synergistic geometry‐angle coupling. This unique design features a semicircular dual‐side structure tilted at 60° and integrated into a lightweight porous network, which not only establishes bidirectional heat‐transfer pathways to homogenize temperature fields and suppress hotspots, but also directs salt‐crystallization toward the edges, effectively preventing pore blockage. The resultant evaporator delivers a high evaporation rate of 2.88 kg m −2 h −1 and energy efficiency exceeding 93% under one‐sun illumination, with remarkable long‐term stability in high‐salinity environments. Our strategy pioneers a shift from conventional planar design to intelligent three‐dimensional structural modulation, providing a promising structural paradigm for efficient and durable solar desalination.