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Issue 2, 2015
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A metal–organic framework route to in situ encapsulation of Co@Co3O4@C core@bishell nanoparticles into a highly ordered porous carbon matrix for oxygen reduction

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Abstract

Rational design of non-noble metal catalysts with an electrocatalytic activity comparable or even superior to Pt is extremely important for future fuel cell-based renewable energy devices. Herein, we demonstrate a new concept that a metal–organic framework (MOF) can be used as a novel precursor to in situ encapsulate Co@Co3O4@C core@bishell nanoparticles (NPs) into a highly ordered porous carbon matrix (CM) (denoted as Co@Co3O4@C–CM). The central cobalt ions from the MOF are used as a metal source to produce Co metal cores, which are later transformed into a fancy Co@Co3O4 nanostructure via a controlled oxidation. The most notable feature of our Co@Co3O4@C–CM is that the highly ordered CM can provide much better transport pathways than the disordered pure MOF derived nanostructure that can facilitate the mass transport of O2 and an electrolyte. As a result, the well-designed Co@Co3O4@C–CM derived from the MOF shows almost identical activity but superior stability and methanol tolerance for the ORR relative to the commercial Pt/C in alkaline medium. Our work reports a novel Co@Co3O4@C nanostructure from a MOF for the first time and also reveals the important role of the introduction of a highly ordered carbon matrix into the MOF derived catalyst in enhancing the ORR activity and stability. To the best of our knowledge, the Co@Co3O4@C–CM is the most efficient non-noble metal nanocatalyst ever reported for the ORR.

Graphical abstract: A metal–organic framework route to in situ encapsulation of Co@Co3O4@C core@bishell nanoparticles into a highly ordered porous carbon matrix for oxygen reduction

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Publication details

The article was received on 20 Jul 2014, accepted on 13 Nov 2014 and first published on 13 Nov 2014


Article type: Paper
DOI: 10.1039/C4EE02281E
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Energy Environ. Sci., 2015,8, 568-576

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    A metal–organic framework route to in situ encapsulation of Co@Co3O4@C core@bishell nanoparticles into a highly ordered porous carbon matrix for oxygen reduction

    W. Xia, R. Zou, L. An, D. Xia and S. Guo, Energy Environ. Sci., 2015, 8, 568
    DOI: 10.1039/C4EE02281E

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