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Mechanistic investigation of the charge storage process of pseudocapacitive Fe3O4 nanorod film

Authors
  • Li, Ruizhi
  • Liu, Jinping1
  • 1 Institute of Nanoscience and Nanotechnology, Department of Physics
Type
Published Article
Journal
Electrochimica Acta
Publisher
Elsevier
Publication Date
Jan 01, 2013
Accepted Date
Dec 08, 2013
Volume
120
Pages
52–56
Identifiers
DOI: 10.1016/j.electacta.2013.12.040
Source
Elsevier
Keywords
License
Unknown

Abstract

This work presents the quantitative analysis of different mechanistic contribution to charge storage process of Fe3O4 in Li2SO4 aqueous electrolyte using nanorod film electrode as the ideal platform. “Capacity (stored charge)-charging time” relationship and “current-sweep rate” power law relationship, etc. are investigated. In addition to capacitive charge storage process, diffusion-controlled process is also found to occur in Fe3O4 nanorod film. This diffusion-controlled contribution dominates at low rates (78.4% at 0.5mVs−1) and cannot be ignored even at relatively high rates (22.8% at 100mVs−1). Our finding clearly uncovers that nanostructured Fe3O4 stores charges not merely on the surface/near-surface like typical pseudocapacitive materials, but rather through the intercalation of Li+ in the bulk.

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