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Magnetic Cobalt Ferrite Nanocrystals For an Energy Storage Concentration Cell
Author(s) -
Dai Qilin,
Patel Ketan,
Donatelli Greg,
Ren Shenqiang
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201604790
Subject(s) - nanocrystal , electrolyte , redox , cobalt ferrite , cobalt , chemical engineering , energy storage , adsorption , materials science , chemistry , inorganic chemistry , chemical physics , electrode , nanotechnology , thermodynamics , power (physics) , physics , engineering
Energy‐storage concentration cells are based on the concentration gradient of redox‐active reactants; the increased entropy is transformed into electric energy as the concentration gradient reaches equilibrium between two half cells. A recyclable and flow‐controlled magnetic electrolyte concentration cell is now presented. The hybrid inorganic–organic nanocrystal‐based electrolyte, consisting of molecular redox‐active ligands adsorbed on the surface of magnetic nanocrystals, leads to a magnetic‐field‐driven concentration gradient of redox molecules. The energy storage performance of concentration cells is dictated by magnetic characteristics of cobalt ferrite nanocrystal carriers. The enhanced conductivity and kinetics of redox‐active electrolytes could further induce a sharp concentration gradient to improve the energy density and voltage switching of magnetic electrolyte concentration cells.