期刊
CHEMICAL ENGINEERING JOURNAL
卷 371, 期 -, 页码 657-665出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.04.065
关键词
Mn/ZIF-8; Carbon nanofiber; Supercapacitor; Electrospinning
资金
- Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) - Ministry of Science, ICT & Future Planning [NRF-2016M1A2A2936760, NRF-2013R1A5A1073861, NRF-2017R1A2B4005639]
We demonstrate freestanding, flexible, and cost-effective supercapacitor electrodes comprising carbon nanofibers (CNFs) decorated with metal oxide framework (MOF)-derived manganese-doped zinc oxide (Mn@ZnO). Nanoparticles of manganese-doped zeolitic imidazolate framework (ZIF-8) were grown directly on electrospun polyacrylonitrile nanofibers by a simple solution-phase synthesis. Carbonization of these composite fibers produced high surface area dodecahedral Mn@ZnO on core CNFs that provide fast electron-transfer pathways. The synergy between Mn@ZnO (active sites for Faradaic reactions) and the highly electrically conductive carbon nanofiber improves the performance of the supercapacitor electrode. The Mn@ZnO/CNF electrodes exhibit a high specific capacitance of 501 F.g(-1) and retain> 92% of their initial capacitance after 10,000 cycles. The optimized Mn@ZnO/CNF electrodes deliver impressive energy densities of 72.1 W.h.kg(-1) and 33.3 W.h.kg(-1) at power densities of 500 W.kg(-1) and 5000 W.kg(-1), respectively. This electrochemical performance demonstrates that the Mn@ZnO/CNF nanostructured composite is a robust electrode material for long-lifetime high-rate energy storage/delivery devices.
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