Based on the effective physical entanglement between cellulose nanofibers(CNFs)and carbon nanotubes(CNTs),CNF/CNT-PAM hydrogel ink is created via in situ radical polymerization using CNFs as a rheological modifier.Additionally,by adding electrochemically active polypyrrole nanoparticles through in-situ polymerization,a 3D printed flexible supercapacitor with a"sandwich"structure is successfully prepared by combining with an effective three-dimensional structural model design.The relevant rheological and mechanical performances of hydrogel ink are tested,and it is indicated that this hydrogel ink has an excellent shear-thinning property,and is proved to be an appropriate candidate for direct ink writing printing,and the printed hydrogel material can attain 1,927％high stretchability.Through systematically analyzing the electrochemical and mechanical properties of printed flexible supercapacitor,it is found that the area capacitance of the device reaches 265 mF·cm-2 and its capacitance retention rate is 94.5％after 10 000 cycles.The supercapacitor presents a high strength of 2.23 MPa and a high tensile strain of 1 556％,and can be applied in the field of flexible electronic devices in the future.
关键词
3D打印/水凝胶/聚吡咯/超级电容器/高性能
Key words
3D printing/hydrogel/polypyrrole/supercapacitor/high performance
维普
万方数据