Construction of hollow mesoporous PPy microsphere nanostructures coated with MnO2 nanosheet as high-performance electrodes for supercapacitors

被引:9
|
作者
Tong, Lin [1 ]
Wu, Chunxia [2 ]
Hou, Junxian [2 ]
Zhang, Zhixiao [1 ]
Yan, Jiayuan [3 ]
Wang, Guangshuo [1 ]
Li, Zongqi [2 ]
Che, Hongwei [1 ]
Xing, Zhenguo [3 ]
Zhang, Xiaoliang [2 ]
机构
[1] Hebei Univ Engn, Coll Mat Sci & Engn, Handan 056038, Peoples R China
[2] Technol Innovat Ctr Modified Plast Hebei Prov, Handan 056038, Peoples R China
[3] Hebei Key Lab Wear resistant Met Mat High Strength, Handan 056038, Peoples R China
关键词
Hollow mesoporous; MnO2; PPy; Asymmetric supercapacitor; ENERGY-STORAGE; POROUS CARBON; COMPOSITES; FABRICATION; DIOXIDE; ARRAYS; FILM;
D O I
10.1016/j.jelechem.2022.117074
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
In this work, hollow mesoporous PPy microspheres were prepared by using mesoporous SiO2 as a hard tem-plate, and hollow mesoporous PPy@MnO2 composites were successfully synthesized by a low-temperature redox reaction. The unique heterogeneous structure can realize the complementary advantages of the two materials. PPy can be used as a template to support the whole structure, and the design of the hollow structure will further buffer the volume change during cycling. In addition, the mesoporous structure will further increase its specific surface area and porosity, thereby enhancing the stability of its overall structure and inter-nal electron transport, and significantly increasing the number of active sites. Thus, the synthesized hollow mesoporous PPy@MnO2 electrode has outstanding electrochemical properties with a specific capacitance of 713 F g-1 at 1 A g-1 and a 92 % retention rate after 5000 cycles at 4 A g-1. The asymmetric supercapacitor constructed using PPy@MnO2 as the positive electrode material achieved a high energy density of 40.8 Wh kg-1 at a power density of 720 W kg-1. This work inspires a simple idea for designing hollow mesoporous nanocomposite electrodes with excellent electrochemical performance and provides a high-performance super -capacitor material for its practical applications.
引用
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页数:10
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