文章基本信息

标题：Self-Assembly of Mesoporous Nanotubes Assembled from Interwoven Ultrathin Birnessite-type MnO₂ Nanosheets for Asymmetric Supercapacitors
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作者：Ming Huang ; Yuxin Zhang ; Fei Li 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2014
卷号：4
DOI：10.1038/srep03878
出版社：Springer Nature
摘要：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.