Tailoring uniform γ-MnO2 nanosheets on highly conductive three-dimensional current collectors for high-performance supercapacitor electrodes

Sangbaek Park, Hyun Woo Shim, Chan Woo Lee, Hee Jo Song, Ik Jae Park, Jae Chan Kim, Kug Sun Hong, Dong-Wan Kim

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

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Recent efforts have focused on the fabrication and application of three-dimensional (3-D) nanoarchitecture electrodes, which can exhibit excellent electrochemical performance. Herein, a novel strategy towards the design and synthesis of size- and thickness-tunable two-dimensional (2-D) MnO2 nanosheets on highly conductive one-dimensional (1-D) backbone arrays has been developed via a facile, one-step enhanced chemical bath deposition (ECBD) method at a low temperature (∼50 °C). Inclusion of an oxidizing agent, BrO3 , in the solution was crucial in controlling the heterogeneous nucleation and growth of the nanosheets, and in inducing the formation of the tailored and uniformly arranged nanosheet arrays. We fabricated supercapacitor devices based on 3-D MnO2 nanosheets with conductive Sb-doped SnO2 nanobelts as the backbone. They achieved a specific capacitance of 162 F·g−1 at an extremely high current density of 20 A·g−1, and good cycling stability that shows a capacitance retention of ≈92% of its initial value, along with a coulombic efficiency of almost 100% after 5,000 cycles in an aqueous solution of 1 M Na2SO4. The results were attributed to the unique hierarchical structures, which provided a short diffusion path of electrolyte ions by means of the 2-D sheets and direct electrical connections to the current collector by 1-D arrays as well as the prevention of aggregation by virtue of the well-aligned 3-D structure.

Original languageEnglish
Pages (from-to)990-1004
Number of pages15
JournalNano Research
Volume8
Issue number3
DOIs
Publication statusPublished - 2015

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Keywords

  • chemical bath deposition
  • manganese oxide
  • nanosheets
  • SnO nanobelts
  • supercapacitor

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Materials Science(all)

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