Sol-gel-driven combustion wave for scalable transformation of Mn(NO3)2 precursors into MnO2-X/MWCNT supercapacitor electrodes capable of electrochemical activation

Dongjoon Shin, Hayoung Hwang, Taehan Yeo, Seonghyun Park, Taewon Kim, Jaeho Lee, Wonjoon Choi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Hybrids of carbon-based materials and metals/metal oxides have emerged as promising candidates for electrochemical electrodes. While porous and inter-connected networks are necessary for a high specific area and an outstanding electrochemical resistance, the fabrication of rationally designed hybrids requires complex procedures. Herein, we report sol-gel-driven combustion waves (CWs) for one-step transformation from Mn(NO3)2/multi-walled carbon nanotube (MWCNT) into MnO2-X/MWCNT hybrids capable of electrochemical activation. A solidified Mn(NO3)2/MWCNT/nitrocellulose (NC) mixture was prepared by applying drop-casting/drying processes to a precursor solution. The sol-gel-driven CWs, induced through the exothermic reaction of NC, conducted a rapid thermochemical transformation into MnO2-X/MWCNT hybrids. Electrochemical activation using cyclic voltammetry methods resulted in the anodizing and oxidizing of MnO2-X/MWCNT hybrids, thereby presenting porous and inter-connected MnO2/MWCNT electrodes consisting of plate-like MnO2 structures and embedded MWCNTs, as well as the increasing capacitance by 42.5%. Owing to the extended surface area of the porous MnO2 having the conductive networks of entangled MWCNTs among plate-like structures, MnO2/MWCNT supercapacitor electrodes exhibited a highly enhanced specific capacitance (∼259.6 F/g) and an outstanding long-term capacitance retention over 10,000 charge-discharge cycles (∼91% at 100 mV/s). The fabrication strategy using sol-gel-driven CWs enables a facile, new synthesis method for versatile hybrids of carbon-based materials and metals/metal oxides.

Original languageEnglish
Pages (from-to)746-754
Number of pages9
JournalCarbon
Volume152
DOIs
Publication statusPublished - 2019 Nov

Keywords

  • Carbon nanotube
  • Combustion synthesis
  • Manganese oxide
  • Sol-gel process
  • Supercapacitor

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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