Interfacial solar-thermal water evaporation (STWE) shows considerable potential in terms of harvesting fresh water from the ocean, thereinto the design of efficient floatable material with low-cost and salt deposition resistant always one of most concerned issue. In this work, we prepared an economical Janus complex for STWE by assembling commercial carbon nanotubes and porous cotton fiber paper, functionalized by silanization and combination of polyelectrolyte.Because of the synergy of efficient photothermal conversion, localized hot layer and fast transmission of water and vapor, the Janus complex displayed superior evaporation rate of 3.443 kg•m -2 •h -1 under 5 suns (5 kW m −2 ) in saltwater. Moreover, almost no salt was detected in the used Janus complex, the salt deposition was rejected at the source due to the strong ionic strength of polyelectrolyte. These results indicated that the Janus complex has potential applications for water purification.
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