二氧化锰/多孔氮掺杂碳复合材料的制备及线性超级电容器的性能

Preparation of manganese dioxide/porous nitrogen-doped carbon nanocomposite for wire-shaped supercapacitors

线性超级电容器在便携式和可穿戴电子产品中有着巨大的应用前景.本研究以尿素为氮源,葡萄糖为碳源,通过牺牲自模板法,制备了二维超薄多孔结构的氮掺杂碳纳米片(2D-PNC).然后在其表面均匀负载了针状结构的二氧化锰(MnO_(2)),从而得到一种高性能的MnO_(2)@2D-PNC纳米复合材料.在此基础上,将MnO_(2)@2D-PNC涂覆到碳纤维线和铝箔上,分别作为柔性内电极和外电极,利用离子液体凝胶作为固态电解质,制备出具有高能量密度的共轴线性超级电容器,其能量密度可达40.5(W·h)/kg,并且具有良好的循环稳定性能.本研究成果不仅在电极材料结构设计的研究上具有指导意义,而且将为可穿戴储能器件的发展提供新思路和可靠的实验依据.

Wire-shaped supercapacitors hold great promise in portable and wearable electronics.In this work,two-dimensional porous nitrogen-doped carbon(2D-PNC)was prepared through a self-sacrificing template method with urea as nitrogen source and glucose as carbon source.Furthermore,manganese dioxide(MnO_(2))needles were uniformly grown on the surface of 2D-PNC to effectively form MnO_(2)@2D-PNC nanocomposite with high electrochemical performance.On this basis,a novel kind of coaxial wire-shaped supercapacitors has been demonstrated and realized by scrolling MnO_(2)@2D-PNC coated Al foil electrode on MnO_(2)@2D-PNC coated carbon fiber electrode.Remarkably,ionogel is utilized as solid-state electrolyte,ensuring the great reliability and high operating voltage and high thermal/electrochemical stability of coaxial wire-shaped supercapacitors.Benefiting from the intriguing configuration,the coaxial wire-shaped supercapacitors with superior flexibility act as efficient energy storage devices and possess high volumetric energy density(40.5(W·h)/kg)and strong durability.Considering the facile fabrication technology with the outstanding performance,this work paves a new way and provides important research value for the development of wearable energy storage devices.