Defect engineering of MnO2 nanosheets by substitutional doping for printable solid-state micro-supercapacitors

Yang Wang, Yi Zhou Zhang, Yu Qiang Gao, Guan Sheng, Johan E. ten Elshof*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)
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Abstract

Printed flexible energy storage devices such as micro-supercapacitors require high electrochemical performance for practical applications. Here, we report a high volumetric energy density of up to 1.13 × 10−3 Wh cm−3 at a power density of 0.11 W cm−3 by inkjet printing of Fe-doped MnO2 nanosheets inks as active materials on polyimide substrates. The enhancement results from atomic-level substitutional doping of 3d metal ions (Co, Fe, Ni) in sub-nanometer thick 2D MnO2 nanosheets. Substitutional doping introduces new electronic states near the Fermi level, thereby enhancing the electronic conductivity and contributing to the formation of redox-active 3d surface states. Fe-doped MnO2 showed the best performance in terms of specific areal and volumetric capacitance. Our finding suggests that the rational doping at atomic scale shows great promise for achieving high energy and power density flexible energy storage devices.

Original languageEnglish
Article number104306
JournalNano energy
Volume68
Early online date20 Nov 2019
DOIs
Publication statusPublished - 1 Feb 2020

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Keywords

  • Defect engineering
  • Flexible electronics
  • Inkjet printing
  • Micro-supercapacitors
  • Two dimensional materials

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