  Solar-driven interfacial steam generation for desalination has attracted
broad attention. However, a significant challenge still remains for achieving a
higher evaporation rate and high water quality, together with a cost-effective
and easy-to-manufacture device to provide a feasible solar-driven steam
generation system. In this study, a novel ultra-black paint, Black 3.0, serving
as a perfect solar absorber is introduced into the hot-pressed melamine foam
networks, allowing us to construct an ultra-black (99% absorptance in the solar
region) and self-floating evaporation device. The high performing features of
effective solar absorptance and salt-rejection capability contribute to a
high-to-date evaporation rate of freshwater at 2.48 kg m-2 h-1 under one sun (1
kW m-2). This interfacial solar evaporator has a daily drinkable water yield of
2.8 kg m-2 even in cloudy winter weather and maintains stability in water with
a wide range of acidity and alkalinity (pH 1~14). These features will enable
the construction of a facilely fabricated, robust, highly-efficient, and
cost-effective solar steam generation system for freshwater production.
