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Advanced Functional Materials: has MXene based multi stage foam material with high efficiency and stability for solar desalination.

wallpapers Cruise 2020-07-15
Although water is the most abundant resource on the earth the shortage of fresh water resources has always been the key problem restricting social development. Using the water evaporation structure of sunlight heat conversion to produce pure water continuously efficiently in the sunlight is the ideal choice to solve this problem. Solar absorber materials used in seawater desalination must have some basic requirements including broadb spectral absorption high photothermal conversion efficiency low thermal conductivity good stability salt resistance. In the past few decades carbonaceous materials plasma nanoparticles have been the two major types of photothermal conversion materials. However up to now neither carbonaceous materials nor plasma nanoparticles can meet the basic requirements of ideal solar absorbers for seawater desalination.

in recent years mxene as a new two-dimensional material has been proved to have great prospects as a solar absorber material for desalination of seawater. Although some studies have been carried out on its desalination performance its solar steam conversion efficiency is still limited there is still a lot of room for improvement.

Professor Liang Jiajie of Nankai University designed manufactured a multi-layer hybrid structure foam material based on MXene MOF applied to high efficiency solar thermal desalination technology. Among them cobalt nanoparticle carbon nanosheet /MXene multistage foam (Co-CNS/M foam) as a solar absorber has broadb optical absorption high photothermal conversion efficiency low thermal conductivity fast water transport capacity excellent chemical stability. In addition when combined with the hydrophobic insulation layer with hydrophilic channel the salt crystallization can be effectively inhibited. The

team used MXene nanosheets Co-MOF as precursors to design prepare a multi-layered cobalt nanoparticle carbon nanosheet /MXene foam material (Co-CNS/M foam). The material consists of vertically aligned mxene nanosheets assembled into a 3D microporous framework on which vertical 2D carbon nanosheets embedded with cobalt nanoparticles are grown. These three types of photothermal materials are integrated to form a unique multi-level structure which makes co CNS / M foam have the key characteristics of an ideal solar absorber. Firstly the 2D nanosheets prepared by MOF carbonization can enhance the light absorption through multi-level scattering reflection. Second the molecular thermal vibration of carbonaceous materials the plasma thermal concentration effect of cobalt nanoparticles ensure high photothermal conversion efficiency. Thirdly the amorphous carbon nanosheets porous framework structure reduce the thermal conductivity of the composites. Fourth the hydrophilic vertical porous channel structure realizes the fast water transmission. Fifthly the chemical stability of mxene framework is enhanced by the carbon nanosheets on the surface of mxene. Finally the polystyrene thermal insulation layer with hydrophilic channel between the solar absorber the water can further inhibit the heat loss transfer the accumulated salt back into the water which improves the salt resistance of the whole desalination system. Based on these key features

can convert the solar steam conversion efficiency of Co-CNS/M foam to 93.39% (average 93.06%) under a solar irradiance which is higher than that of all MXene based photothermal materials reported. Moreover after 100 hours of irradiation the water production rate did not decrease significantly which fully shows that the designed evaporation system has good long-term stability salt resistant crystallization ability. This construction strategy opens the way for the development of mxene based new solar absorbers for sustainable solar desalination.


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