Improved supercapacitors by implanting ultra-long single-walled carbon nanotubes into manganese oxide domains

Wei Gong, Bunshi Fugetsu, Qiaojing Li, Adavan Kiliyankil Vipin, Tomoya Konishi, Takayuki Ueki, Ichiro Sakata, Zhipeng Wang, Mingpeng Yu, Lei Su, Xueji Zhang, Mauricio Terrones, Morinobu Endo

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number228795
JournalJournal of Power Sources
Volume479
DOIs
StatePublished - Dec 15 2020

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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