钠离子混合电容器将电容型电极和电池型电极组合于一个器件，有望成为性能高、成本低、安全、环境友好的新一代储能器件，用于未来的电力汽车、智能电网和电子设备等。本项目拟采用酸蚀的方法可控合成二维层状类石墨烯过渡金属铌碳化合物Nbn＋1CnTx，通过合成方法的优化和后期处理调控其表面官能团的成分和比例以及层间距；利用自组装和原位碳化的方法制备Nbn＋1CnTx/聚吡咯、Nbn＋1CnTx/碳量子点复合电极材料，获得无粘合剂无模板的柔性自支撑Nbn+1CnTx基钠离子混合电容器电极；研究电极的微观结构、电化学性质、构效关系，利用理论与实验相结合的方法探索表面官能团在储能中的作用、钠离子在层状结构中的嵌入过程，研究电极材料储能机制；设计、组装高能量密度、高功率密度、长循环寿命的钠离子混合电容器。为发展Nbn＋1CnTx基新一代绿色储能器件并推广到其它类石墨烯材料奠定基础。

Sodium hybrid supercapacitor is an energy storage system constructed with a battery-type electrode and a capacitive electrode. They have been expected to be new generation of energy storage devices with high performance, low cost, safety, and environmental friendliness which have potential applications in future electric vehicles, smart electric grids, and electronic devices..In this project Nbn＋1CnTx (MXene), a transition metal carbide with 2D structure is to be synthesized using acid corrosion. The surface functional groups and the interlayer spacings could be controlled by adjusting the preparation precedures and post-treatments. Nbn＋1CnTx/Ppy and Nbn＋1CnTx/carbon quantum dots composite electrode materals would be fabricate by self-assembly and in-situ carbonization..Binder-free and template-free flexible free-standing electrodes are prepared for Sodium hybrid supercapacitor. The structure and electrochemical properties, the relationship between its structure properties and electrocapacitive performances, the effects of the surface functional groups on storing energy as well as the interlayer insertion/removal process of sodium ions are going to be studied by both theory method and experimemts. The energy storage mechanism of the material will be explored. Sodium hybrid supercapacitor with high energy density, high power density and long cycle life will be designed and assembled.This project will expand the application of Nbn＋1CnTx and other MXene materials in the new generation of green energy storage devices.