| The three-phase interface consisting of solid-liquid-gas interface widely exists in nature.Based on the super-wetting phenomenon of the three-phase interface in nature,researchers have prepared a variety of super-wetting interface materials in a bionic way.Nature-inspired bionic super-wetting materials have moved from the laboratory to production and life after more than 20 years of research.They are widely used in oil-water separation,self-cleaning,anti-fog glass,sensors and other fields.In fact,as long as the introduction of super-wetting interface for all the phenomena of the three-phase interface in life,it will have a good or unfavorable effect on the performance.Therefore,the difficult problems in most fields can be solved by super-wetting the surface based on interface science.In view of the urgent need to solve the problem of material durability and stability in the field of electromagnetic shielding,it has been proposed to enhance the durability and stability with a superhydrophobic surface and expand the application range of electromagnetic shielding materials.But it still cannot be used in extreme oily environments.Therefore,it is an inevitable choice to introduce super-double phobic surface to solve the problem of oil stain corrosion resistance.In the electrolysis water reaction caused by bubbles,the bubbles accumulate on the surface but cannot be desorbed to form an ineffective zone,which reduces the catalytic activity.Although most electrolyzed water catalytic electrodes have a certain degree of hydrophilicity,only superhydrophilic/underwater superhydrophobic surfaces can be formed on surfaces with sufficient micro-nano structures.This type of super-wet surface will cause the bubbles to form a discontinuous three-phase contact line on the catalyst surface,thereby quickly releasing the bubbles and accelerating the reaction efficiency.The main contents are as follows:(1)In order to enable electromagnetic interfere shielding materials to be used in extreme environments,the superamphiphobic interface is constructed on the surface of electromagnetic shielding interfere materials.The carbon cloth as the substrate,controlled the growth of Fe3O4 nanoparticles with a diameter about 250 nm to provide sufficient magnetic permeability to require the need of electromagnetic shielding,and then grow polypyrrole microarrays with a length of 1-2 ?m through electrodeposition to provide electrical conductivity.At the same time,the hydrophobic surface is obtained.Finally,the superamphiphobic surface is introduced by constructing a low surface energy micro-nano structure,which is mainly composed of 1H,1H,2H,2H-perfluorodecyltriethoxysilane,multi-walled carbon nanotubes and Silica composition.The surface composition and electromagnetic shielding performance of the material were studied.In addition,after 5,000 kneading release cycles,60 minutes of ultrasonic,sandpaper abrasion 50 times,24 h of ultraviolet radiation and 10 h of soaking in acid,alkali and different organic solvents,the resulting material still has superamphiphobicity and high performance.It means that can be used in extreme environments,giving EMI shielding materials a wide range of applications.(2)The superhydrophilic/underwater superaerophobic interface is constructed on the gas evolution reaction electrode to accelerate the release of gas products.The copper foam as the substrate,the Cu(OH)2 nanowires are grown by simple etching and then followed by gentle solvothermal vulcanization.After the reaction,the superhydrophilic/underwater superaerophobic CuS electrode with micro-nano structure was successfully prepared.The prepared electrode has a crater-like surface morphology.It only takes 5 ms for water droplets to wet the surface,and the contact angle of underwater bubbles is as high as 153.5°,which meets the superaerophobic standard.At the same time,the bubble release behavior of the superaerophobic surface was studied.The superaerophobic surface has been proven to accelerate the removal of bubbles on the electrode,thereby promoting the catalytic process.The catalytic activity of the prepared superhydrophilic/underwater superhydrophobic CuS electrode was evaluated by electrochemical characterization,and the results showed that it not only has good oxygen evolution reaction activity under alkaline conditions,but also has very good hydrogen evolution activity under acidic medium.The current density is selected to be 10 mA·cm-2,which confirms that the overpotential for oxygen evolution of the electrode in alkaline electrolyte(1 mol·L-1 KOH)is 350 mV,and only has a Tafel slope of 85 mV·Dec-1;and in acid electrolyte the overpotential for hydrogen evolution in medium(0.5 mol·L-1 H2SO4)is 134 mV,and the Tafel slope is 120 mV·Dec-1.It has excellent stability within 10 h. |
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