利用纤维素纳米纤维(CNFs)作流变改性剂,基于CNFs和碳纳米管(CNTs)之间有效的物理缠结作用,协同原位自由基聚合反应成功合成水凝胶油墨CNF/CNT-PAM。进一步通过原位聚合引入电化学活性聚吡咯纳米颗粒,利用有效的三维结构模型设计成功制备了"三明治"结构的3D打印柔性超级电容器,并对电极凝胶的流变性能和机械性能进行测试。结果表明,凝胶墨水具有优异的剪切稀变能力且适用于直接墨水书写(DIW)打印,打印的结构材料可以实现1 927%的高拉伸性。再对所打印的柔性超级电容器电化学性能和机械性能进行系统性分析,器件的面积电容达到265 mF/cm²,在10 000次循环中电容保持率为94.5%,拥有2.23 MPa的高强度和1 556%的高拉伸性,未来能够应用于柔性电子器件领域。

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.

刘维怡(2000-),女,硕士生,研究方向为柔性可拉伸材料与器件,1736654390@qq.com;秦海利(1987-),男,理学博士,副教授,硕士生导师,研究方向为柔性可拉伸材料与器件,通讯联系人,qinhaili@hfut.edu.cn。