Fe(CN)63- ion-modified MnO2/graphene nanoribbons enabling high energy density asymmetric supercapacitors

被引:63
作者
Sheng, Lizhi [1 ]
Jiang, Lili [1 ]
Wei, Tong [1 ]
Zhou, Qihang [1 ]
Jiang, Yuting [1 ]
Jiang, Zimu [1 ]
Liu, Zheng [1 ]
Fan, Zhuangjun [1 ]
机构
[1] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Minist Educ, Key Lab Superlight Mat & Surface Technol, Harbin 150001, Heilongjiang, Peoples R China
基金
中央高校基本科研业务费专项资金资助; 中国国家自然科学基金;
关键词
HEXACYANOFERRATE/MNO2; COMPOSITE; CARBON MATERIALS; MANGANESE OXIDE; POROUS CARBON; HIGH-POWER; GRAPHENE; CAPACITANCE; ELECTRODES; CONSTRUCTION; NANOFLAKES;
D O I
10.1039/c8ta01375f
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:7649 / 7658
页数:10
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