期刊
NANOSCALE
卷 11, 期 24, 页码 11946-11955出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr02607j
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资金
- National Natural Science Foundation of China [21566030]
- Ministry of Science, and Technology China-South Africa Joint Research Program [CS08-L15]
- Project of Inner Mongolia Education Department [NJZY089]
- Natural Science Foundation of Inner Mongolia [2015MS0205]
The low energy densities of supercapacitors (SCs) are generally limited by the used anodes. To develop SCs with high energy densities, Fe3+ modified V2O5@GQDs (m-V2O5@GQDs) and ZIF-67-derived nanoporous carbon loaded with Mn3O4 (C/N-Mn3O4) were synthesized. After their detailed characterization using electron microscopy, X-ray methods and electrochemical techniques, they were further utilized as the anode and the cathode, respectively, to construct asymmetric supercapacitors (ASCs). The as-synthesized m-V2O5@GQDs improve the poor conductivity of V2O5, contributing greatly to a specific capacitance of 761 F g(-1) at a current density of 2 A g(-1). With application of a cell voltage of 2 V, an energy density of up to 99.4 W h kg(-1) is achieved at a power density of 1000 W kg(-1). Such ASCs also exhibit outstanding cycling performance (95% of initial capacitance even after 10 000 charging/discharging cycles). This study thus provides a new way to design and construct ASCs with high energy densities.
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