材料科学
杰纳斯
石墨烯
氧化物
阳极
纳米复合材料
纳米片
纳米技术
复合数
纳米颗粒
透射电子显微镜
化学工程
锂(药物)
电极
复合材料
物理化学
医学
内分泌学
化学
冶金
工程类
作者
Jinho Jang,Seok Hyun Song,Hyeri Kim,Junsoo Moon,Hyungju Ahn,Kyoung Il Jo,Joona Bang,Hyungsub Kim,Jaseung Koo
标识
DOI:10.1021/acsami.1c02892
摘要
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.
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