Formation mechanism of MnxCo3-xO4 yolk-shell structures

Chang-Yang Chiang, Wuzong Zhou

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Formation of MnxCo3−xO4 yolk–shell microspheres via a solvothermal reaction of hydrated cobalt and manganese nitrates in ethanol is investigated. Spinel nanocrystals of cobalt oxide or cobalt-rich ternary oxide preferentially develop in the system, while manganese-rich hydroxide form Mn(OH)2-type nanosheets. Instead of continuing to grow individually, the nanocrystallites and nanosheets aggregate into large microspheres due to their strong inter-particle interaction. When the proportion of Mn-rich nanosheets is high, therefore the overall density is low, dehydration of hydroxide nanosheets and a surface re-crystallisation lead to formation of a dense and rigid shell, which is separated from a solid or hollow core via a further Ostwald ripening process. The proposed formation mechanism of the yolk–shell structures based on electron microscopic studies would help us to develop yolk–shell structure based multifunctional materials.
Original languageEnglish
Pages (from-to)29108-29114
Number of pages7
JournalRSC Advances
Issue number47
Early online date1 Sept 2021
Publication statusPublished - 2021


  • Mesoporous MNCO2O4
  • Ion batteries
  • MN
  • Microspheres
  • Performance
  • Fabrication
  • Reduction
  • Catalysts
  • Anodes
  • Oxides


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