ã€Chinese instrument network instrument research and development】 Recently, the cooperation team led by Deng Weiqiao, researcher of the 1109 Institute of Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and DHL21T3 researcher Wu Zhongshuai made new progress in the research of electrode materials for high specific capacitance supercapacitors. Conductive conjugated microporous polymers with high specific surface area and high nitrogen content were published in German Applied Chemistry.
Photo court Dalian Institute of Chemical Physics.
As a new type of environmentally friendly energy storage devices, supercapacitors have been widely used in hybrid electric vehicles. Because it stores a large amount of charge on the electrode through the double layer mechanism, finding a highly conductive electrode material (usually a porous carbon material) with a high specific surface area is the key to increasing the device capacity. The researchers found that nitrogen-doped carbon materials can be introduced into the tantalum capacitors through the nitrogen atoms, allowing them to store more energy. Based on the research literature of nitrogen-doped carbon materials, high-performance electrode materials need to have both a high specific surface area and a high nitrogen doping amount, and these two factors generally contradict the same type of material. In the advanced electrode materials currently reported for supercapacitors, the maximum specific surface area is generally not more than 3000 m 2 /g, while the nitrogen doping amount of materials having a high specific surface is usually less than 5 at%.
In order to overcome the above problems, the cooperation team jumped out of the category of nitrogen-doped carbon materials and used TCNQ (7,7,8,8-tetracyanoquinodimethane) as a monomer to polymerize under ionothermal conditions to obtain a series of Covalent triazine frame structure, high specific surface and high nitrogen content conductive conjugated microporous polymer, and applied to supercapacitor electrode material. Among them, a conductive conjugated microporous polymer having an ultra-high specific surface area of ​​3663 m2/g and a high nitrogen content of 8.13% can obtain a high specific capacity of 383 F/g, which is significantly higher than the specific capacity of commercial activated carbon (100-200 F). /g), and has significant cycle stability. This work has for the first time obtained conductive conjugated microporous polymers with high specific surface and high nitrogen content, providing new ideas for the development of higher performance supercapacitor electrode materials.
The 1109 group is dedicated to the simulative design and synthesis of conjugated microporous polymers and has developed conjugated microporous polymer series materials for different applications, such as hydrogen storage materials, water treatment materials, carbon dioxide capture and conversion materials. DNL21T3 is dedicated to the development of high-performance, flexible, and miniaturized supercapacitors and has developed a series of two-dimensional materials such as graphene and doped graphene, black phosphene, MXene, polymers and oxide nanosheets. This cooperation gave full play to the strengths of the two teams and together they focused on an important research direction and realized the perfect combination of the two fields. It is hoped that the integration of microporous polymers and supercapacitors will be promoted. The research work was funded by the National Natural Science Foundation of China and the National Key Research and Development Program.
(Original Title: Dalian Institute of Materials, conjugated microporous polymer applied in supercapacitor research progress)