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Enhanced oxygen reduction of multi-Fe3O4@carbon core-shell electrocatalysts through nanoparticle/polymer co-assembly strategy

Abstract

This paper reports a facile synthesis of multi-Fe3O4@carbon (mFe3O4@C) core-shell nanoparticles (NPs) using co-assembly of Fe3O4 NPs and polystyrene-b-poly(ethylene oxide) (PS-b-PEO) as a template. Slow solvent exchange leads to the multiple of hydrophobic Fe3O4 tiny NPs entrapped within PS-b-PEO micelles. After polydopamine coating and subsequent carbonization, a carbon shell encapsulating multiple Fe3O4 cores is obtained. The significant features of mFe3O4@C lie in the more active Fe3O4 sites and available free space within the carbon shell. As a result, the oxygen reduction performance of the resultant mFe3O4@C shows a higher onset potential than that of single Fe3O4@C. Meanwhile, mFe3O4@C exhibits a larger limiting current density (5.2 mA cm-2 at 1.0 V), long-time stability, and methanol tolerance compared to commercial Pt/C. The generality of the micellar immobilized NPs as a template is expected to boost the fabrication of various core-shell NPs for practical applications

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Publication details

The article was received on 11 Dec 2017, accepted on 11 Feb 2018 and first published on 12 Feb 2018


Article type: Paper
DOI: 10.1039/C7NR09185K
Citation: Nanoscale, 2018, Accepted Manuscript
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    Enhanced oxygen reduction of multi-Fe3O4@carbon core-shell electrocatalysts through nanoparticle/polymer co-assembly strategy

    J. Zhao, C. Li and R. Liu, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C7NR09185K

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