Facile Fabrication and High Supercapacitive Performance of Three-Dimensional Mn/MnOx Periodic Arrays Architecture

Mengya Cui, Ting Huang, Rongshi Xiao, Xin Zhang, Xiaoyang Qin, Qingwei Zhang, Jiejie Xu, Qiang Wu

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, 3D-Mn/MnOx periodic arrays architecture is fabricated through a facile and efficient method. A femtosecond laser is used to generate a 3D conductive network on a metallic manganese surface which also serves as the current collector (3D-Mn), followed by chemical oxidation to form Mn2O3 and MnO2 on the surface of the 3D-Mn. Detailed electrochemical characterization reveals that the 3D-Mn/MnOx electrode exhibits good rate performance and cycle life, and the assembled 3D-Mn/MnOx supercapacitor can deliver the highest energy density of 5.6 μWh/cm2 at a power density of 21.8 μW/cm2. The enhanced performance is attributed to the unique periodic 3D-Mn/MnOx architecture which largely increases the effective electrode surface area, shortens the electron/ion transportation distance, facilitates electrolyte permeation, and reduces the contact resistance between 3D-Mn and MnOx. Importantly, MnOx is formed directly on the 3D-Mn surface, which helps to maintain the structural integrity and mechanical adhesion between each other, and thus is beneficial to long-term electrochemical cycling.

Original languageEnglish
Pages (from-to)14669-14676
Number of pages8
JournalACS Sustainable Chemistry and Engineering
Volume7
Issue number17
DOIs
Publication statusPublished - 2019 Sep 3
Externally publishedYes

Keywords

  • 3D current collector
  • Femtosecond laser
  • Manganese oxides
  • Supercapacitors

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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