Disclosure of charge storage mechanisms in molybdenum oxide nanobelts with enhanced supercapacitive performance induced by oxygen deficiency

Ping Qin, Shi Qing Zhang, Kin Lam YUNG*, Jeffery HUANG, Biao Gao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Molybdenum oxide (MoO3), with superior features of multi-electrochemical states, high theoretical capacitance, and low cost, is a desirable supercapacitor electrode material but suffers from low conductivity and insufficient active sites. The MoO3 capacitance can be largely amplified by introducing oxygen (O) vacancies, but the mechanisms at the atomic scale are still ambiguous. Herein, O vacancies are created at the O2 and O3 sites in the MoO3 nanobelts by carbonization to maximize the supercapacitance in the MoO2.39. The supercapacitive storage is mainly ascribed to the proton adsorption at the O1 sites to create Mo–OH, leading to an expansion of the interlayer spacing along the lattice B-axis. Roughly 98% of the initial supercapacitance is retained after 1000 cycles, due to the reversible change in the interlayer spacing. Our results provide an insight into the oxygen deficiency-related mechanisms of the supercapacitive performance at the atomic scale and devise a facile method to enhance the supercapacitance for energy storage and conversion. Graphic abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)2447-2454
Number of pages8
JournalRare Metals
Volume40
Issue number9
DOIs
Publication statusPublished - Sep 2021

Scopus Subject Areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

User-Defined Keywords

  • Charge storage mechanisms
  • MoO nanobelts
  • Oxygen vacancies
  • Supercapacitance

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