期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 17, 页码 7649-7658出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta01375f
关键词
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资金
- National Natural Science Foundation of China [51672055]
- Ten Thousand Talent Program
- PhD Student Research and Innovation Fund of the Fundamental Research Funds for the Central Universities [HEUGIP201712]
- Natural Science Foundation of Heilongjiang Province [LC2016017]
Due to its high theoretical specific capacitance and high oxygen evolution potential, MnO2 has been considered as a promising positive electrode material for high-energy asymmetric supercapacitors (ASCs). However, the search for MnO2 positive electrodes with high specific capacitance and excellent rate performance for ASCs remains challenging. Herein, for the first time we report a novel strategy for the synthesis of Fe(CN)(6)(3-) ion-modified MnO2/graphene ribbons (m-MnO2/GRs) as the positive electrode for high energy density ASCs. Benefiting from vertically aligned MnO2 grown on the interconnected graphene ribbon and Fe(CN)(6)(3-) ion modification, the m-MnO2/GR exhibits a high specific capacitance of 435 F g(-1), excellent rate capability and cycling stability. More importantly, the assembled m-MnO2/GR//GR ASC exhibits a high energy density of 57.8 W h kg(-1) at a power density of 1.2 kW kg(-1), as well as outstanding cycling stability with 100% capacitance retention after 10 000 cycles. More importantly, such a device can be charged/discharged within 0.79 s in an ultrafast manner to deliver a high specific energy of 10.5 W h kg(-1) at an ultrahigh specific power of 48 kW kg(-1). Thus, our strategy could be possibly used for the design and fabrication of new energy storage devices with high energy and power densities for future applications.
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