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Recently, Professor Ma Mingming's group at the School of Chemistry and Materials Science, University of Science and Technology of China, has designed a high-strength supramolecular hydrogel made of conductive polyaniline and polyvinyl alcohol cross-linked by dynamic chemical bonds, and prepared it as an electrode material. A flexible all-solid supercapacitor with high specific capacity and stability. This result was published online at Angew. Chem. Int. Ed. (DOI: 10.1002/anie.201603417). The first author of the dissertation was Li Wanwan, a doctoral student of the research group.
Electrochemically active hydrogels are expected to become flexible energy storage materials and have broad application prospects in the field of flexible electronic devices. However, the mechanical properties and stability of the existing electroactive hydrogels are poor, and it is difficult to meet the requirements for the electrode materials of the flexible supercapacitors. Therefore, designing and developing electroactive hydrogel materials with excellent mechanical properties and stability has important application value.
In response to this goal, Ma Mingming's research group applied the principle of supramolecular structure design, and used a boronate ester bond to self-assemble rigid polyaniline and flexible polyvinyl alcohol at the molecular level to form a three-dimensional dynamic network structure with high strength. Electroactive supramolecular hydrogels. The hydrogel has a tensile strength of 5.3 MPa and an elongation at break of 250%. At a current density of 0.5 A/g, the specific capacitance value reaches 928 F/g, and the specific capacitance retention rate after 1000 times of charging and discharging reaches 90. %. The hydrogel's mechanical properties, electrochemical activity and stability are significantly greater than the existing electroactive hydrogels. The hydrogel was assembled as an electrode material into a flexible all-solid supercapacitor, achieving a specific capacity of 153 F/g at a current density of 0.25 A/g, a specific capacitance retention ratio of 100% after 1000 folds, and storage at room temperature. The specific capacitance retention rate after the week reached 93%. This work provides new ideas for designing new types of flexible energy storage devices.
The study was funded by the National Natural Science Foundation of China and the Thousand Talents Program of the Central Organization Department.
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