Fast Energy Storage in Two-Dimensional MoO2 Enabled by Uniform Oriented Tunnels

Yuanyuan Zhu, Xu Ji, Shuang Cheng, Zhao Ying Chern, Jin Jia, Lufeng Yang, Haowei Luo, Jiayuan Yu, Xinwen Peng, Jenghan Wang, Weijia Zhou, Meilin Liu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

While pseudocapacitive electrodes have potential to store more energy than electrical double-layer capacitive electrodes, their rate capability is often limited by the sluggish kinetics of the Faradaic reactions or poor electronic and ionic conductivity. Unlike most transition-metal oxides, MoO2 is a very promising material for fast energy storage, attributed to its unusually high electronic and ionic conductivity; the one-dimensional tunnel is ideally suited for fast ionic transport. Here we report our findings in preparation and characterization of ultrathin MoO2 sheets with oriented tunnels as a pseudocapacitive electrode for fast charge storage/release. A composite electrode consisting of MoO2 and 5 wt % GO demonstrates a capacity of 1097 C g-1 at 2 mV s-1 and 390 C g-1 at 1000 mV s-1 while maintaining ∼80% of the initial capacity after 10,000 cycles at 50 mV s-1, due to minimal change in structural features of the MoO2 during charge/discharge, except a small volume change (∼14%), as revealed from operando Raman spectroscopy, X-ray analyses, and density functional theory calculations. Further, the volume change during cycling is highly reversible, implying high structural stability and long cycling life.

Original languageEnglish
Pages (from-to)9091-9099
Number of pages9
JournalACS Nano
Volume13
Issue number8
DOIs
Publication statusPublished - 2019 Aug 27

Keywords

  • Density functional theory calculations
  • MoO
  • capacitor
  • energy storage
  • operando Raman

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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  • Cite this

    Zhu, Y., Ji, X., Cheng, S., Chern, Z. Y., Jia, J., Yang, L., Luo, H., Yu, J., Peng, X., Wang, J., Zhou, W., & Liu, M. (2019). Fast Energy Storage in Two-Dimensional MoO2 Enabled by Uniform Oriented Tunnels. ACS Nano, 13(8), 9091-9099. https://doi.org/10.1021/acsnano.9b03324