College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China.
College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000, China.
J Colloid Interface Sci. 2018 Nov 1;529:171-179. doi: 10.1016/j.jcis.2018.06.007. Epub 2018 Jun 5.
A three-dimensional (3D) flower-shaped LiTiO-graphene (Gr) hybrid micro/nanostructures and pine needles derived carbon nanopores (PNDCN) has been prepared by using the effective hydrothermal process. Due to the unique micro/nanostructures which can provide abundant surface active sites, the obtained 3D LiTiO-Gr displays a high specific capacitance of 706.52 F g at 1 A g. The prepared PNDCN also exhibits high specific capacitance of 314.50 F g at 1 A g benefiting from its interconnected honeycomb-like hierarchical and open structure, which facilitates the diffusion and reaction of electrolyte ions and enables an isotropic charging/discharging process. An asymmetric supercapacitor utilizing LiTiO-Gr as positive electrode and PNDCN as negative electrode has been fabricated, it delivers a high energy density of 35.06 Wh kg at power density of 800.08 W kg and outstanding cycling stability with 90.18% capacitance retention after 2000 cycles. The fabrication process presented in this work is facile, cost-effective, and environmentally benign, offering a feasible solution for manufacturing next-generation high-performance energy storage devices.
采用有效水热法制备了三维（3D）花状 LiTiO-石墨烯（Gr）杂化微/纳米结构和松针衍生碳纳米孔（PNDCN）。由于独特的微/纳米结构可以提供丰富的表面活性位点，所获得的 3D LiTiO-Gr 在 1 A g 时表现出 706.52 F g 的高比电容。所制备的 PNDCN 还表现出 314.50 F g 的高比电容，这得益于其互连的蜂窝状分级和开放结构，有利于电解质离子的扩散和反应，并实现各向同性的充电/放电过程。利用 LiTiO-Gr 作为正极和 PNDCN 作为负极组装了非对称超级电容器，在 800.08 W kg 的功率密度下，它具有 35.06 Wh kg 的高能量密度和出色的循环稳定性，经过 2000 次循环后电容保持率为 90.18%。本工作中提出的制造工艺简单、经济高效且环境友好，为制造下一代高性能储能器件提供了可行的解决方案。
