期刊
ACS NANO
卷 9, 期 5, 页码 5198-5207出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b00582
关键词
metal oxide; supercapacitor anode; energy density; cycling stability; atomic layer deposition
类别
资金
- Agency for Science, Technology and Research (A*STAR, Singapore) [1121202013]
Supercapacitor with ultrahigh energy density (e.g., comparable with those of rechargeable batteries) and long cycling ability (>50000 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 similar to 74.7 Wh/kg at a power of similar to 1400 W/kg, and 95.4% of the capacitance can be retained after 50000 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 of high-performance electrochemical energy storage.
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