One-step transformation of MnO2 into MnO2-: X@carbon nanostructures for high-performance supercapacitors using structure-guided combustion waves

Jungho Shin, Dongjoon Shin, Hayoung Hwang, Taehan Yeo, Seonghyun Park, Wonjoon Choi

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


The manipulation of micro/nanostructured metal oxides is crucial to advancing their diverse applications, including as electrodes in supercapacitors or batteries, catalysts, and pigments. However, controlling the physicochemical properties of metal oxides requires complex procedures with bulky setups that incur high costs and long processing times. Herein, we present a facile one-step manipulation of the reduced states of manganese oxides and the synthesis of carbon coatings surrounding them, using structure-guided combustion waves (SGCWs), which is induced by incomplete combustion through the chemical fuel-wrapped materials. Controlled oxygen release from MnO2 using SGCWs in air and in an Ar atmosphere enabled direct fabrication of reduced Mn2O3/Mn3O4/MnO and MnO, respectively. Furthermore, control of the incompletely combusted carbonaceous fuel facilitated the synthesis of carbon coating layers to form Mn2O3/Mn3O4/MnO@C and MnO@C. These core-shell nanostructures of reduced manganese oxides and carbon layers were applied as supercapacitor electrodes. These electrodes showed better specific capacitance (maximum 438 F g-1 at 10 mV s-1 scan rate for Mn2O3/Mn3O4/MnO@C) and improved stability in charge-discharge performance compared with bare MnO2, due to the carbon coatings enhancing electrical conductivity in the percolation network of electrodes and facilitating the reversible redox reaction without degradation during cycling operations. SGCWs are applicable for fast, low-cost, and large-scale fabrication of reduced metal oxides and organic material coatings, which could significantly contribute to electrochemical applications.

Original languageEnglish
Pages (from-to)13488-13498
Number of pages11
JournalJournal of Materials Chemistry A
Issue number26
Publication statusPublished - 2017

Bibliographical note

Funding Information:
This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), which is funded by the Ministry of Education (NRF-2015R1D1A1A01059274). The authors gratefully acknowledge the financial support provided by Defense Acquisition Program Administration and Agency for Defense Development under the contract UD150032GD.

Publisher Copyright:
© 2017 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Chemistry
  • Renewable Energy, Sustainability and the Environment
  • General Materials Science


Dive into the research topics of 'One-step transformation of MnO2 into MnO2-: X@carbon nanostructures for high-performance supercapacitors using structure-guided combustion waves'. Together they form a unique fingerprint.

Cite this