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American Chemical Society, ACS Nano, 5(9), p. 5198-5207, 2015

DOI: 10.1021/acsnano.5b00582

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Iron Oxide-Decorated Carbon for Supercapacitor Anodes with Ultrahigh Energy Density and Outstanding Cycling Stability

Journal article published in 2015 by Cao Guan, Jilei Liu ORCID, Yadong Wang, Lu Mao, Zhanxi Fan, Zexiang Shen, Hua Zhang ORCID, John Wang
This paper is available in a repository.
This paper is available in a repository.

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Abstract

Supercapacitor with ultrahigh energy density (e.g. comparable with those of rechargeable batteries) and long cycling ability (>50 000 cycles) is attractive for the next-generation energy storage devices. The energy density of carbonaceous material electrodes can be effectively improved by combining with certain metal oxides/hydroxides, but many at the expenses of power density and long-time cycling stability. To achieve an optimized overall electrochemical performance, rationally designed electrode structures with proper control in metal oxide/carbon are highly desirable. Here we have successfully realized an ultrahigh-energy and long-life supercapacitor anode by developing a hierarchical graphite foam-carbon nanotube framework and coating the surface with a thin layer of iron oxide (GF-CNT@Fe2O3). The full-cell of anode based on this structure gives rise to a high energy of ~74.7 Wh/kg at the power of ~1400 W/kg, and ~95.4% of the capacitance can be retained after 50 000 cycles of charge-discharge. These performance features are superior among those reported for metal oxide based supercapacitors, making it a promising candidate for the next generation high performance electrochemical energy storage.