Flexible Hybrid Membranes of NiCo2O4-Doped Carbon Nanofiber@MnO2 Core鈥揝heath Nanostructures for High-Performance Supercapacitors

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• 作者：Feili Lai ; Yue-E Miao ; Yunpeng Huang ; Tai-Shung Chung ; Tianxi Liu
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：June 18, 2015
• 年：2015
• 卷：119
• 期：24
• 页码：13442-13450
• 全文大小：560K
• ISSN：1932-7455

文摘

Construction of MnO₂-based hybrid nanostructures with carbonaceous materials has been considered as one of the most efficient strategies to overcome excessive aggregations of MnO₂ particles. Here, a facile approach of growing 未-phase and 纬-phase MnO₂ with distinctly different morphologies on highly conductive NiCo₂O₄-doped carbon nanofibers (NCCNFs) through the combination of electrospinning, solution codeposition, and redox deposition methods is presented to form NCCNF@MnO₂ nanosheet (or nanorod) core鈥搒heath nanostructures. The obtained two kinds of flexible hybrid membranes with hierarchical nanostructures are both evaluated as electrodes for high-performance supercapacitors. The greatly improved specific surface areas for ionic adsorption, significantly enhanced conductivity of NCCNF, and an open three-dimensional network for rapid electron transportation during the electrochemical processes jointly lead to remarkably enhanced specific capacitances of 918 and 827 F g^鈥? (based on the active materials) at a scan rate of 2 mV s^鈥? and good cycling ability with 83.3% and 87.6% retention after 2000 cycles for NCCNF@MnO₂ nanosheet and NCCNF@MnO₂ nanorod hybrid membranes, respectively. Therefore, this work suggests a novel strategy for design and potential application of MnO₂ hybrid materials in high-performance supercapacitors.