Self-assembly of mesoporous nanotubes assembled from interwoven ultrathin birnessite-type MnO2 nanosheets for asymmetric supercapacitors.

Self-assembly of mesoporous nanotubes assembled from interwoven ultrathin birnessite-type MnO2 nanosheets for asymmetric supercapacitors.
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用于非对称超级电容器的交织超薄水钠锰矿型MnO2纳米片自组装介孔纳米管

DOI:
10.1038/srep03878
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发表时间:
2014-01-27
期刊:
影响因子:
4.6
通讯作者:
Liu Q
Liu Q
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Huang M;Zhang Y;Li F;Zhang L;Ruoff RS;Wen Z;Liu Q

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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纳米管被用作超级电容器电极。三电极系统在0.25 A g(-1)电流密度下的比电容为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、活化石墨烯为负极的非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 纳米结构的报告值。超级电容器的性能与多孔MnO2纳米管的分级结构相关。
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.
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发表时间: 2012-01-01
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