Enabling Self‐Adaptive Water‐Energy‐Balance of Photothermal Water Diode Evaporator: Dynamically Maximizing Energy Utilization Under the Ever‐Changing Sunlight

with a high efficiency of 93.7% under 1 sun illumination is achieved. This water diode engineering with Janus wettability provides a novel strategy and extends the path for designing solar evaporation systems with diverse water supply properties, which shows great potential in different environmental conditions.