Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 12, Pages 3105-3111Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201805550
Keywords
bimetallic electrochemical catalysts; covalent organic frameworks; electrochemistry; multifunctional catalysts; oxygen reduction reactions
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Funding
- China Ministry of Science and Technology [2016YFA0202802]
- National Natural Science Foundation of China [21403280]
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Covalent organic frameworks (COFs) are a new class of crystalline porous polymers comprised mainly of carbon atoms, and are versatile for the integration of heteroatoms such as B, O, and N into the skeletons. The designable structure and abundant composition render COFs useful as precursors for heteroatom-doped porous carbons for energy storage and conversion. Herein, we describe a multifunctional electrochemical catalyst obtained through pyrolysis of a bimetallic COF. The catalyst possesses hierarchical pores and abundant iron and cobalt nanoparticles embedded with standing carbon layers. By integrating these features, the catalyst exhibits excellent electrochemical catalytic activity in the oxygen reduction reaction (ORR), with a 50mV positive half-wave potential, a higher limited diffusion current density, and a much smaller Tafel slope than a Pt-C catalyst. Moreover, the catalyst displays superior electrochemical performance toward the hydrogen evolution reaction (HER), with overpotentials of -0.26V and -0.33V in acidic and alkaline aqueous solution, respectively, at a current density of 10mAcm(-2). The overpotential in the catalysis of the oxygen evolution reaction (OER) was 1.59V at the same current density.
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