The Fabrication Of Nitrogen-Doped Carbon-Based Porous Materials And Its Application In Energy Storage And Conversion

Synthesized by organic molecules,porous polymers have many advantages like the incomparable advantages like economally accessible,environmentally friendly and abundant raw materials.In addition,the large specific surface area,good conductivity and stable mechanical properties also help them getting more and more attention.All the advantages endow them with broad application prospects over inorganic materials or metals in the field of energy storage and conversation.By adjusting the pore size and optimizing the pore size distribution of porous polymer materials,the original excellent properties of porous polymer materials can be consolidated and new characteristics can be endowed,so that the application scope of porous polymer materials can be broadened.The purpose of this paper is to combine the existing research results,in view of the problems encountered in the practical application of porous materials,try to use simple and efficient means like the control of pore size,nitrogen doping at the same time to achieve pore size adjustment and pore channel optimization distribution,which is more conducive to the performance of porous materials in the field of energy.On this basis,the porous material with hierarchical pore structure and a large number of nitrogen doping are utilized to realize the modification of the porous material by metal ions,so that the electrochemical catalytic performance of the porous material is greatly improved.Specific research contents and conclusions are as follows.1.Study on pore size adjustment and application of carbon-based porous polymer:we proposed a simple and effective method for pore size adjustment,which is changing the molar ratio of ZnCl₂ and pDCB.Thus a series of nitrogen-doped porous organic polymer?N-PPFs?with tunable pore size,synthesized by ion thermal polymerization,were obtained.The experimental results show that the N-PPF-20 has excellent sodium storage performance,not only has great specific capacity at low current density,but also has good capacity at high current density.Additionally it has good constant current stability and multiplying performance.Besides,as the electrode material of supercapacitor,N-PPF-20 also showed excellent performance in the three-electrode test system,with extremely high specific capacity and good cycle stability,and its performance was better than most of the same type of carbon-based composites.2.Study on the application of modified porous polymer by the metal ion in electrochemical catalysis:based on the work of N-PPFs in the last chapter,N-PPF-20,with large specific surface area and the most reasonable pore size distribution,was selected as the framework of metal ion modification.Different metal salts were used to heat and stir with N-PPF-20 in aqueous solution,then adjusted the concentration of metal ions.Finally,a series of metal ion modified porous polymers were obtained,which showed excellent performance as catalysts for electrochemical redox reactions.