TY - JOUR
T1 - Thicker carbon-nanotube/manganese-oxide hybridized nanostructures as electrodes for creation of fiber-shaped high-energy-density supercapacitors
AU - Gong, Wei
AU - Fugetsu, Bunshi
AU - Wang, Zhipeng
AU - Ueki, Takayuki
AU - Sakata, Ichiro
AU - Ogata, Hironori
AU - Han, Fei
AU - Li, Mingda
AU - Su, Lei
AU - Zhang, X.
AU - Terrones, Mauricio
AU - Endo, Morinobu
N1 - Funding Information:
This work is supported in part by grants from the Project of Saitama Prefectural Industry-Academia Collaborative Development Project Subsidy. W.G. acknowledges support from Advanced Characterization Nanotechnology Platform of the University of Tokyo , supported by “Nanotechnology Platform” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan . W.G. also acknowledges Mr. Shigeru Ohtsuka and Mr. Toshio Ito for their help in the measurement of the SEM and TEM images in the University of Tokyo .
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/12
Y1 - 2019/12
N2 - This work demonstrates a high-energy-density and flexible supercapacitor as a potential energy source for smart electronics devices. Cathode and anode are fiber-shaped electrodes with manganese oxide (MnO2) being electrochemically inserted into densely interconnected carbon nanotube (CNT) networks as active domains, while carbon fibers (CF) serve as current collectors. The CNT/MnO2 hybrids are built up as a co-axial shell with an optimized thickness of 1.44 μm surrounding CF. Specific volumetric capacitance is found as high as 527 F cm−3 when a 1.0 M Na2SO4 aqueous solution is used as electrolyte; when a solid electrolyte (polyvinyl alcohol and lithium chloride, PVA/LiCl) is used, the specific volumetric capacitance is found as high as 492 F cm−3. These values, to the best of our knowledge, are the highest values of the specific volumetric capacitance among all the MnO2-based fiber-shaped electrodes reported in previous literature. An all-solid-state (PVA/LiCl) symmetric fiber-shaped supercapacitor cell is assembled and a volumetric energy density of 8.14 mWh cm−3 which is high enough for driving a portable LED device, is obtained. Our fiber-shaped supercapacitor cell is safe, flexible, and capable of powering smart electronic devices.
AB - This work demonstrates a high-energy-density and flexible supercapacitor as a potential energy source for smart electronics devices. Cathode and anode are fiber-shaped electrodes with manganese oxide (MnO2) being electrochemically inserted into densely interconnected carbon nanotube (CNT) networks as active domains, while carbon fibers (CF) serve as current collectors. The CNT/MnO2 hybrids are built up as a co-axial shell with an optimized thickness of 1.44 μm surrounding CF. Specific volumetric capacitance is found as high as 527 F cm−3 when a 1.0 M Na2SO4 aqueous solution is used as electrolyte; when a solid electrolyte (polyvinyl alcohol and lithium chloride, PVA/LiCl) is used, the specific volumetric capacitance is found as high as 492 F cm−3. These values, to the best of our knowledge, are the highest values of the specific volumetric capacitance among all the MnO2-based fiber-shaped electrodes reported in previous literature. An all-solid-state (PVA/LiCl) symmetric fiber-shaped supercapacitor cell is assembled and a volumetric energy density of 8.14 mWh cm−3 which is high enough for driving a portable LED device, is obtained. Our fiber-shaped supercapacitor cell is safe, flexible, and capable of powering smart electronic devices.
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U2 - 10.1016/j.carbon.2019.08.004
DO - 10.1016/j.carbon.2019.08.004
M3 - Article
AN - SCOPUS:85070238567
SN - 0008-6223
VL - 154
SP - 169
EP - 177
JO - Carbon
JF - Carbon
ER -