Journal
CRYSTALS
Volume 12, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/cryst12101444
Keywords
electrochemical capacitor; high current; vapor-grown carbon fibers; MnO2 nanosheets
Funding
- Jiangsu Fund Project [BK20220700]
- Project of Natural Science Research in Colleges and Universities of Jiangsu Province [21KJD150004]
- Jiangsu Province Education Department Major Project [19KJA140003]
- Jiangsu Agriculture Science and Technology Innovation Fund (JASTIF) [CX(20)3169]
- Innovation and entrepreneurship training program for College Students [202010324017Z]
- Opening Project of Jiangsu Province Engineering Research Center of Agricultural Breeding Pollution Control and Resource [2021ABPCR015]
- Open Fund of Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province [JBGS023]
- Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources [JKLBS2020004]
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Composites of vertically grown MnO2 nanosheet arrays on the surface of VGCFs are fabricated through a low-temperature redox reaction. An assembled electrochemical capacitor with AC/0.5 M K2SO4/MnO2@VGCF exhibits higher specific capacitance and better rate capability at fast-current density compared to the standalone MnO2 capacitor prepared by hydrothermal method. Electrochemical tests reveal that VGCFs act as a conducting matrix, effectively improving the conductivity of MnO2 nanosheets during cycling.
Composites of MnO2 nanosheet arrays vertically grown on the surface of vapor-grown carbon fibers (VGCFs) are fabricated by a low-temperature redox reaction between KMnO4 and the VGCFs. An assembled AC/0.5 M K2SO4/MnO2@VGCF electrochemical capacitor exhibits a higher specific capacitance, as well as a better rate capability, at a fast-current density compared to the capacitor built on hydrothermally prepared, standalone MnO2. Electrochemical tests revealed that VGCFs act as a conducting matrix, which effectively improves the conductivity of MnO2 nanosheets during cycling.
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