The water evaporation performance experiments were conducted using a solar simulator (M-LS Rev B, Abet Tech), outputting a simulated solar flux of 1 sun. The solar flux was measured using a thermopile (818SL, Newport) connected to a power meter (1916-R, Newport). h-LAHs with a thickness of ca. 0.5 cm were floated on pure water (or unpurified for purification tests) in a beaker with a solar flux of 1 sun. The mass of the water loss was measured by a lab balance with a 0.1-μg resolution and calibrated to weights heavier than the total weight of the setup. All evaporation rates were measured after a stabilization under 1 sun for 30 min.