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Preparation and properties of photothermal conversion NiCoP@NF hierarchical structure material with wide-band absorption and high salt resistance

HUANG Hao;ZHU Han;LU Shuanglong;DUAN Fang;DU Mingliang;School of Chemical and Material Engineering,Ministry of Education,Jiangnan University;Key Laboratory of Synthetic and Biological Colloids,Ministry of Education,Jiangnan University;  
In order to realize low-cost and efficient sea water desalination, a hierarchical structure was built on nickel foam(NF) by hydrothermal reaction and chemical vapor deposition, sea-urchin-like NiCoP(SU-NiCoP) and nanoflower-like NiCoP(FL-NiCoP) were grown in-situ and a hierarchical structure material was prepared. The microstructure, crystal structure, surface chemistry and photothermal conversion properties of this hierarchical structure material were analyzed by means of field emission scanning electron microscopy(FE-SEM), transmission electron microscopy(TEM), energy spectrum analysis(EDS), X-ray diffractometer(XRD), X-ray photoelectron spectroscopy(XPS), UV-visible-near infrared absorption spectrum(UV-vis-NIR) and infrared thermal imaging(IR), etc. The results show that this hierarchical structure material has porous structure and a rough surface, which can cause the incident sunlight in it to have multiple scattering and convert it into heat at the air/water interface. Under the solar irradiation intensity of 1000 W/m~2, the highest full-spectrum absorption rate of the hierarchical structure material is up to 98.0%, the highest evaporation rate is 1.51 kg/(m~2·h), and the solar-to-steam efficiencies reach 81.7% and 96.1% respectively. Hydrophobic treatment further promotes the high salt resistance of this solar photothermal conversion evaporator, which can maintain evaporation properties in NaCl solution with a high mass fraction(10%) for a long time, endowing this material with excellent cyclic stability and high salt resistance.
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