TY - JOUR
T1 - Improved supercapacitors by implanting ultra-long single-walled carbon nanotubes into manganese oxide domains
AU - Gong, Wei
AU - Fugetsu, Bunshi
AU - Li, Qiaojing
AU - Vipin, Adavan Kiliyankil
AU - Konishi, Tomoya
AU - Ueki, Takayuki
AU - Sakata, Ichiro
AU - Wang, Zhipeng
AU - Yu, Mingpeng
AU - Su, Lei
AU - Zhang, Xueji
AU - Terrones, Mauricio
AU - Endo, Morinobu
N1 - Funding Information:
The authors wish to acknowledge the Reviewers for their helpful comments and suggestions. 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, Mr. Masahiro Fukukawa and Mr. Masatsugu Tamura for their help in the measurement of the SEM images in the University of Tokyo.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/12/15
Y1 - 2020/12/15
N2 - Ultra-long single-walled carbon nanotubes (SWCNTs) are implanted into thicker manganese oxide (MnO2) domains for enhancing the ultimate energy density of the MnO2 based supercapacitors. The implanted SWCNTs form a nano-meshed jungle-gym wherein the MnO2 domains are densely packed. Functioned as templates, MnO2 domains have been divided into nano-sized particles during the electrochemical deposition of the thicker MnO2 domains. Functioned as conductive paths, electrons transferred under lower resistances via the SWCNT networks during the charge/discharge. The ultimate thickness of the resultant SWCNT-MnO2, which is established on the cell-walls of nickel foams (NF; NF served as current collectors) can reach to 13.3 μm while the electrochemical performance of the SWCNT-MnO2@NF electrode remains excellent (1898 mF cm−2 capacitances; 101.9% specific capacitance retention ratios, after 10,000 times of charge/discharge). We also assembled asymmetric supercapacitor cells and obtained high energy densities (734.1 μWh cm−2) and high power densities (18.47 mW cm−2 at 277.1 μWh cm−2). Electrochemical data are analysed based on Dunn's method, new insights into the capacitive behaviours of the SWCNT-MnO2@NF are observed.
AB - Ultra-long single-walled carbon nanotubes (SWCNTs) are implanted into thicker manganese oxide (MnO2) domains for enhancing the ultimate energy density of the MnO2 based supercapacitors. The implanted SWCNTs form a nano-meshed jungle-gym wherein the MnO2 domains are densely packed. Functioned as templates, MnO2 domains have been divided into nano-sized particles during the electrochemical deposition of the thicker MnO2 domains. Functioned as conductive paths, electrons transferred under lower resistances via the SWCNT networks during the charge/discharge. The ultimate thickness of the resultant SWCNT-MnO2, which is established on the cell-walls of nickel foams (NF; NF served as current collectors) can reach to 13.3 μm while the electrochemical performance of the SWCNT-MnO2@NF electrode remains excellent (1898 mF cm−2 capacitances; 101.9% specific capacitance retention ratios, after 10,000 times of charge/discharge). We also assembled asymmetric supercapacitor cells and obtained high energy densities (734.1 μWh cm−2) and high power densities (18.47 mW cm−2 at 277.1 μWh cm−2). Electrochemical data are analysed based on Dunn's method, new insights into the capacitive behaviours of the SWCNT-MnO2@NF are observed.
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U2 - 10.1016/j.jpowsour.2020.228795
DO - 10.1016/j.jpowsour.2020.228795
M3 - Article
AN - SCOPUS:85089950156
SN - 0378-7753
VL - 479
JO - Journal of Power Sources
JF - Journal of Power Sources
M1 - 228795
ER -
