由交织的超薄水钠锰矿型MnO₂纳米片组装而成的介孔纳米管用于不对称超级电容器的自组装。
Self-assembly of mesoporous nanotubes assembled from interwoven ultrathin birnessite-type MnO2 nanosheets for asymmetric supercapacitors.
作者信息
Huang Ming, Zhang Yuxin, Li Fei, Zhang Lili, Ruoff Rodney S, Wen Zhiyu, Liu Qing
机构信息
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China.
1] College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China [2] National Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology, Chongqing University, Chongqing 400044, P.R. China.
出版信息
Sci Rep. 2014 Jan 27;4:3878. doi: 10.1038/srep03878.
Porous nanotubes comprised of MnO2 nanosheets were fabricated with a one-pot hydrothermal method using polycarbonate membrane as the template. The diameter and thickness of nanotubes can be controlled by choice of the membrane pore size and the chemistry. The porous MnO2 nanotubes were used as a supercapacitor electrode. The specific capacitance in a three-electrode system was 365 F g(-1) at a current density of 0.25 A g(-1) with capacitance retention of 90.4% after 3000 cycles. An asymmetric supercapacitor with porous MnO2 nanotubes as the positive electrode and activated graphene as the negative electrode yielded an energy density of 22.5 Wh kg(-1) and a maximum power density of 146.2 kW kg(-1); these values exceeded those reported for other MnO2 nanostructures. The supercapacitor performance was correlated with the hierarchical structure of the porous MnO2 nanotubes.
以聚碳酸酯膜为模板，采用一锅水热法制备了由MnO₂纳米片组成的多孔纳米管。纳米管的直径和厚度可以通过选择膜孔径和化学性质来控制。多孔MnO₂纳米管用作超级电容器电极。在三电极系统中，电流密度为0.25 A g⁻¹时，比电容为365 F g⁻¹，3000次循环后电容保持率为90.4%。以多孔MnO₂纳米管为正极、活性石墨烯为负极的不对称超级电容器的能量密度为22.5 Wh kg⁻¹，最大功率密度为146.2 kW kg⁻¹；这些值超过了其他MnO₂纳米结构的报道值。超级电容器性能与多孔MnO₂纳米管的分级结构相关。
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