Journal
ELECTROCHIMICA ACTA
Volume 120, Issue -, Pages 52-56Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.12.040
Keywords
Magnetite; Pseudocapacitor; Charge storage mechanism; Diffusion-controlled process
Categories
Funding
- National Natural Science Foundation of China [51102105, 11104088]
- Natural Science Foundation of Hubei Province [2013CFA023]
- CCNU from the Colleges' Basic Research and Operation of MOE [CCNU12A01009]
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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 0.5 mV s(-1)) and cannot be ignored even at relatively high rates (22.8% at 100 mV s(-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. (C) 2013 Elsevier Ltd. All rights reserved.
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