Janus Graphene Oxide Sheets with Fe3O4Nanoparticles and Polydopamine as Anodes for Lithium-Ion Batteries

Jiwon Jang, Seok Hyun Song, Hyeri Kim, Junsoo Moon, Hyungju Ahn, Kyoung Il Jo, Joona Bang, Hyungsub Kim, Jaseung Koo

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


In this study, a one-step process to fabricate "Janus"-structured nanocomposites with iron oxide (Fe3O4) nanoparticles (Fe3O4 NPs) and polydopamine (PDA) on each side of a graphene oxide (GO) nanosheet using the Langmuir-Schaefer technique has been proposed. The Fe3O4 NPs-GO hybrid is used as a high-capacity active material, while PDA is added as a binder due to its unique wet-resistant adhesive property. The transmission electron microscopy image shows a superlattice-like out-of-plane section of the multilayered nanocomposite, which maximizes the density of the composite materials. Grazing-incidence small-angle X-ray scattering results combined with scanning electron microscopy images confirm that the multilayered Janus composite exhibits an in-plane hexagonal array structure of closely packed Fe3O4 NPs. This Janus multilayered structure is expected to maximize the amount of active material in a specific volume and reduce volume changes caused by the conversion reaction of Fe3O4 NPs. According to the electrochemical results, the Janus multilayer electrode delivers an excellent capacity of ∼903 mAh g-1 at a current density of 200 mA g-1 and a reversible capacity of ∼639 mAh g-1 at 1 A g-1 up to the 1800th cycle, indicating that this Janus composite can be a promising anode for Li-ion batteries.

Original languageEnglish
Pages (from-to)14786-14795
Number of pages10
JournalACS Applied Materials and Interfaces
Issue number12
Publication statusPublished - 2021 Mar 31


  • 2D Janus material
  • Langmuir-Schaefer technique
  • anode
  • graphene oxide
  • iron oxide nanoparticle
  • lithium-ion batteries
  • polydopamine

ASJC Scopus subject areas

  • Materials Science(all)


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