Oreparation And Solar Steam Generation Properties Of Composite Structure With Plasmonic TiN Nanoparticles

As a renewable resource,solar energy has the advantages of inexhaustibility,clean and safety,and has received more and more attention.Water evaporation occurs at the air-water interface,thus the solar-driven water evaporation technology that localizes heat to the air-water interface can achieve highly efficient light-heat conversion and utilization.It has broad application prospects in the fields of seawater desalination and sewage treatment.TiN has a wider and stronger plasmon resonance absorption spectrum than traditional photothermal conversion materials,so it is considered to be a promising photothermal conversion material.In this paper,base on the design and preparation of TiN-based composite materials,the self-built simulated transpiration device was used to study the photothermal conversion performance of the prepared TiN-based composite materials,and to exploit its application in solar steam.In order to improve the water evaporation rate of the photothermal conversion film,TiN nanoparticles are used as the photothermal conversion materials,polyvinyl alcohol?PVA?as the water transport layer,and hydrophilic chronic filter paper as the substrate to prepare the PVA-TiN composite film by surface deposition method The results show that the light absorption and photothermal conversion performance of the pure PVA film is weak,but after adding TiN nanoparticles,the absorption of the PVA-TiN composite film in the entire solar spectral range is significantly enhanced.When the light intensity is 1 k W m^-2,the evaporation rate of the PVA-15%TiN sample reaches 1.43 kg m^-2 h^-1,which is 1.27 times that of the pure PVA film.The design of the composite film with the water transport layer and photothermal conversion layer has a significant enhancement effect on solar-driven water evaporation.The conduction heat loss of the filter paper substrate into the bulk water is large.In this paper,wood chips with low thermal conductivity are used as the substrate,and the wood-TiN composite material is prepared by spin coating meththed.When the spin coating speed is 2000 rpm,the TiN nanoparticles are evenly dispersed on the surface of the wood chips.In order to further improve the hydrophilicity of the wood chips,the surface of the wood chips was treated with plasma,and then the TiN dispersion was coated on the surface of the wood chips by spin coating to prepare highly efficient light-absorbing TWP composite materials.When the plasma treatment time is 2 min,under the light il umination of 1 k W m^-2,the evaporation rate of the TWP sample can reach 1.87 kg m^-2 h^-1,which is 1.3 times that of the TW sample without plasma surface treatment.When processing the simulated seawater,under the light of 1 k W m^-2,the evaporation rate can be maintained at 1.26 kg m^-2 h^-1 after10 cycles.