Explore On The Synthesis And Properties Of Polypyrrole-based Hydrogel

The energy storage and conversion of clean and renewable energy is vital to the social development of the 21st century.As a typical energy storage and conversion device,electrochemical capacitor has many advantages such as high power density,long life and good pulse charge and discharge characteristics,and has a wide range of applications.On the other hand,the use of another clean and renewable energy-solar energy for water evaporation can provide an opportunity to solve the global water shortage problem.Polypyrrole（PPy）is considered to be one of the most promising conductive polymers due to its many advantages such as high conductivity,high stability,easy synthesis and broad spectrum absorption.Gel-like polypyrrole combines the advantages of light weight,porosity,large specific surface area and the characteristics of polypyrrole as a gel material,and shows outstanding application potential in energy storage and conversion such as supercapacitors and solar water evaporation.At present,although this research field has made certain developments,how to use simple methods to obtain novel hydrogels;how to increase conductivity,specific capacitance and solar water evaporation rate through doping is still an important concern of people problem.Based on this,this paper mainly carries out the following work:（1）Using pyrrole and aluminum reagent（ATA）as raw materials and ferric chloride as oxidant,a type of ATA-doped polypyrrole hydrogel（PPY/ATA）was obtained by adjusting experimental conditions,and its electrochemistry was investigated.performance.The research results show that the conductivity of PPY/ATA hydrogel can be as high as 10.1 S/cm;when the gel is used as the electrode material of the three-electrode test system,when the current density is 0.2 A/g,the specific capacitance is as high as 1209 F/g,which is about 2.2 times that of ordinary PPY（540F/g）;in the two-electrode measurement system,when the current is 0.2 A/g,the specific capacitance is 680 F/g,which is much larger than ordinary PPY.The above shows that the addition of ATA enhances the electrochemical performance of polypyrrole hydrogel.（2）Using pyrrole and 1,2,3,4-butanetetracarboxylic acid（BTA）as raw materials,and ferric chloride as oxidant,another type of polypyrrole hydrogel（PPY/BTA）was obtained by changing the experimental conditions.And inspected its solar water evaporation ability.The research results show that PPY/BTA hydrogel has the advantages of high water content（95.7%）,low thermal conductivity(0.25 W·m^-1·K^-1)and fast water transmission.Under one simulated sunlight,The water evaporation rate can be as high as 1.9 kg·m^-2·h^-1,which is about 1.55 times that of ordinary PPY,showing high-efficiency solar water evaporation performance.The gel can also be used to evaporate sea water,methyl orange（MO）dye and Ag-NPs wastewater,and the evaporation rates are 1.6 kg·m^-2·h^-1,1.85 kg·m^-2·h^-1,1.89 kg·m^-2·h^-1,respectively,showing a good application prospect.（3）Using pyrrole and carbon nanotube（CNT）as raw materials,ferric chloride as oxidant,and optimizing experimental conditions,a polypyrrole/carbon nanotube（PPY/CNT）hydrogel was synthesized,and the composite gel was explored.Solar water evaporation performance.The research results show that the PPY-based hydrogel synthesized by introducing CNT under a simulated sunlight,the solar water evaporation rate is as high as 2.84 kg·m^-2·h^-1,which is a PPY-based hydrogel synthesized without CNT(1.22 kg·m^-2·h^-1)2.3 times,which provides a new idea for how to increase the solar water evaporation rate of PPY-based hydrogel materials.PPY/CNT hydrogel also exhibits high-efficiency wastewater（methyl orange and nano silver solution）regeneration capabilities and seawater desalination capabilities,and is expected to have potential application value in water purification and regeneration.