The design of ZnO nanorod arrays coated with MnOx for high electrochemical stability of a pseudocapacitor electrode

Hsiang Chun Chen, Yang Ru Lyu, Alex Fang, Gang Juan Lee, Lakshmanan Karuppasamy, Jerry J. Wu, Chung Kwei Lin, Sambandam Anandan, Chin Yi Chen

Research output: Contribution to journalArticle

Abstract

Tremendous efforts have been made on the development of unique electrochemical capacitors or pseudocapacitors due to the overgrowing electrical energy demand. Here, the authors report a new and simple strategy for fabricating hybrid MnOx-coated ZnO nanorod arrays. First, the vertically aligned ZnO nanorods were prepared by chemical bath deposition (CBD) as a template providing a large surface area for active material deposition. The manganese oxide was subsequently coated onto the surface of the ZnO nanorods to form a hybrid MnOx-coated ZnO nanostructure by anodic deposition in a manganese acetate (MnA)-containing aqueous solution. The hybrid structure of MnOx-coated ZnO nanorod arrays exhibits a large surface area and high conductivity, essential for enhancing the faradaic processes across the interface and improving redox reactions at active MnOx sites. A certain concentration of the deposition solution was selected for the MnOx coating, which was studied as a function of deposition time. Cyclic voltammetry (CV) curves showed that the specific capacitance (SC) of the MnOx-coated ZnO nanostructure was 222 F/g for the deposition times at 10 s when the concentration of MnA solution was 0.25 M. The unique hybrid nanostructures also exhibit excellent cycling stability with >97.5% capacitance retention after 1200 CV cycles. The proposed simple and cost-effective method of fabricating hybrid nanostructures may pave the way for mass production of future intelligent and efficient electrochemical energy storage devices.

Original languageEnglish
Article number475
JournalNanomaterials
Volume10
Issue number3
DOIs
Publication statusPublished - Mar 2020

Keywords

  • Anodic deposition
  • Chemical bath deposition
  • Cyclic voltammetry
  • Manganese oxide
  • Pseudocapacitor
  • ZnO nanorod

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)

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    Chen, H. C., Lyu, Y. R., Fang, A., Lee, G. J., Karuppasamy, L., Wu, J. J., Lin, C. K., Anandan, S., & Chen, C. Y. (2020). The design of ZnO nanorod arrays coated with MnOx for high electrochemical stability of a pseudocapacitor electrode. Nanomaterials, 10(3), [475]. https://doi.org/10.3390/nano10030475