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Growth and Electrochemical Characterization versus Lithium of Fe 3 O 4 Electrodes Made by Electrodeposition
Author(s) -
Mitra S.,
Poizot P.,
Finke A.,
Tarascon J.M.
Publication year - 2006
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200500753
Subject(s) - materials science , electrochemistry , lithium (medication) , electrolysis , electrolyte , electrode , deposition (geology) , cathodic protection , characterization (materials science) , chemical engineering , carbon fibers , reactivity (psychology) , nanotechnology , inorganic chemistry , composite material , composite number , chemistry , medicine , paleontology , sediment , engineering , biology , endocrinology , alternative medicine , pathology
Interest in binary oxides has been renewed because of their novel reactivity towards Li at low potential, which leads to large capacity gains. Here, the structural, morphological, and electrochemical properties of copper‐supported Fe 3 O 4 deposits prepared by cathodic reduction of a Fe III chelate in alkaline solution are reported. By tuning the deposit growth parameters, namely the deposition time and the temperature of the electrolytic bath, it is possible to prepare deposits with various morphologies. Thick deposits with well‐faceted particles of Fe 3 O 4 are produced when long deposition times are used; thin and shapeless deposits are formed after shorter electrolysis times. A screening study shows Fe 3 O 4 films prepared at 50 °C under –5 mA cm –2 for 40 s give the best electrochemical performance towards Li, namely with a sustained reversible capacity for over 50 cycles and outstanding rate capability even after 50 repeated charge–discharge sequences. Electrodeposition techniques provide an alternative efficient way to configure high‐performance conversion electrodes based on carbon‐free binary oxides.