Coaxial-nanostructured MnFe2O4 nanoparticles on polydopamine-coated MWCNT for anode materials in rechargeable batteries

MnFe2O4@PDA-coated MWCNT coaxial nanocables are successfully designed via a simple one-pot process by utilizing the adhesion property of polydopamine (PDA) with cations in aqueous solutions and employing a modified co-precipitation synthesis at a low temperature. The incorporation of the PDA coating...

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Bibliographic Details
Published in:Nanoscale 2018-10, Vol.10 (40), p.18949-18960
Main Authors: Kim, Hyeongwoo, Jong-Won, Lee, Byun, Dongjin, Choi, Wonchang
Format: Article
Language:English
Subjects:
Adhesive strength
Anchors
Anodes
Anodic coatings
Aqueous solutions
Catechol
Chemical precipitation
Coated electrodes
Coating effects
Coprecipitation
Electrode materials
Functional groups
Manganese
Nanoparticles
Rechargeable batteries
Superalloys
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Summary:MnFe2O4@PDA-coated MWCNT coaxial nanocables are successfully designed via a simple one-pot process by utilizing the adhesion property of polydopamine (PDA) with cations in aqueous solutions and employing a modified co-precipitation synthesis at a low temperature. The incorporation of the PDA coating layer on the MWCNT leads to the well-dispersed state of the MWCNTs in the aqueous solution due to the hydrophilic functional group of the PDA coating layer. In addition, the catechol-based functional group of the PDA coating layer effectively anchors the Mn and Fe ions from the aqueous solution before the co-precipitation process, eventually resulting in the preferential and homogeneous formation of MnFe2O4 nanoparticles on the MWCNT. The final MnFe2O4@PDA-coated MWCNT electrode exhibits excellent power characteristics such as a high rate capacity of around of 367 mA h g−1 at a 5C-rate condition (= 4585 mA g−1). Cycling tests reveal that the stable performance of the MnFe2O4@PDA-coated MWCNT electrode persists even after 350 cycles.
ISSN:2040-3364
2040-3372
DOI:10.1039/c8nr04555k