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Preparation of La0.7Sr0.3CoO3-δ (LSC)@MnO2 core/shell nanorods as high-performance electrode materials for supercapacitors

  • Ling HeEmail author
  • Yao Shu
  • Wensheng Li
  • Maocheng Liu
Review
  • 84 Downloads

Abstract

Perovskite oxides have attracted significant attention as capacitor electrode materials owing to their unique physical and electronic properties. In this paper, a novel La0.7Sr0.3CoO3-δ (LSC)@MnO2 core–shell nanorod was synthesized by controlled electrospinning combined with hydrothermal synthesis. The LSC, as a typical perovskite-type material, with excellent stability and ion–electron double conductivity, can perfectly serve as conductive backbone. Grid-like MnO2 nanosheets are grown on LSC to form a unique core/shell nanostructure, could effectively improve the electrochemical performance of MnO2. The grid-like MnO2 nanosheets shell significantly increase the effective area over which the reaction may take place and reduce the ion/electron transmission distance, which is beneficial in that it shifts in ions and electrons, enhancing the electrochemical reaction kinetics thereof. LSC@MnO2 core/shell nanorods demonstrated good electrochemical performance with high capacitance (570 F g−1 at 1 A g−1), and revealed excellent cycling stability (capacitance retention remains at 97.2% after 5000 cycles). The asymmetric supercapacitor device (LSC@MnO2//AC) displayed a desirable energy density of 37.6 W h kg−1 at 375 W kg−1, and still remains at 23.3 W h kg−1 at a high power density of 7489.3 W kg−1, indicating that the LSC@MnO2 nanorods are an outstanding pseudo-capacitive electrode material, with significant potential for application in high-performance supercapacitors.

Notes

Acknowledgements

This work was supported by Joint fund between Shenyang National Laboratory for Materials Science and State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals [Grant Numbers 18LHPY006]; the Key Research and Development Program of Gansu Province [Grant Numbers 17JR7GA014]; National Natural Science Foundation of China [Grant Numbers 51674130].

Compliance with ethical standards

Conflict of interest

There are no conflicts to declare.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous MetalsLanzhou University of TechnologyLanzhouPeople’s Republic of China
  2. 2.School of Materials Science and EngineeringLanzhou University of TechnologyLanzhouPeople’s Republic of China

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