Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 928, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2022.117074
Keywords
Hollow mesoporous; MnO2; PPy; Asymmetric supercapacitor
Categories
Ask authors/readers for more resources
In this work, hollow mesoporous PPy microspheres were prepared as a support structure, and hollow mesoporous PPy@MnO2 composites were successfully synthesized. The unique heterogeneous structure of the composite enhances its stability, electron transport, and active sites. The synthesized electrode exhibits outstanding electrochemical properties and the supercapacitor constructed using this material achieves a high energy density.
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available