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A study of ordered mesoporous carbon doped with Co and Ni as a catalyst of oxygen reduction reaction in both alkaline and acidic media
Univ Belgrade, Fac Phys Chem, Studentski Trg 12-16, Belgrade 11158, Serbia..
Univ Belgrade, Inst Nucl Sci Vinca, POB 522, Belgrade 11000, Serbia..
Univ Belgrade, Fac Phys Chem, Studentski Trg 12-16, Belgrade 11158, Serbia..
Univ Belgrade, Inst Nucl Sci Vinca, POB 522, Belgrade 11000, Serbia.;Univ Belgrade, Innovat Ctr, Fac Chem, Studentski Trg 12, Belgrade 11158, Serbia..
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2018 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 349, p. 511-521Article in journal (Refereed) Published
Abstract [en]

The incorporation of trace amounts (< 0.2%) of Co and Ni noticeably enhanced the catalytic activity of nitrogen free ordered mesoporous carbon (OMC) towards oxygen reduction reaction (ORR). (Co,Ni)-doped OMCs were characterized by N-2-adsorption measurements, X-ray powder diffraction, field emission scanning electron microscopy and Raman spectroscopy methods, and their ORR activity was estimated by voltammetry on rotating disk electrode in acidic and alkaline media. (Co,Ni)-doped OMCs show modest activities in acidic media, while the catalytic activity in alkaline media is rather high. The measured activities are compared to the Pt-based and Pt-free ORR catalysts reported in the literature. The number of electrons consumed per O-2 in metal-doped OMCs was found to vary between 2 and 4, which is advantageous in comparison to metal-free OMC. Also, the mass activities of metal-doped OMCs were found to be up to 2.5 times higher compared to that of metal-free OMC. We suggest that the ORR activity is governed by a balance between (i) textural properties, which determine the electrochemically accessible surface of the catalyst and which are influenced by the addition of a metal precursor, and (ii) novel active sites formed upon the introduction of metals into the carbon structure. In particular, our Density Functional Theory calculations suggest that Co and Ni atoms embedded into the single vacancies of graphene can activate the O-2 molecule and contribute to the decomposition of peroxide.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 349, p. 511-521
Keywords [en]
Electrocatalysts, Oxygen reduction reaction, Ordered mesoporous carbon, Cobalt, Nickel, Metal dopants
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-234568DOI: 10.1016/j.surfcoat.2018.06.008ISI: 000441492600054Scopus ID: 2-s2.0-85048745900OAI: oai:DiVA.org:kth-234568DiVA, id: diva2:1248879
Funder
Swedish Research Council, 2014-5993
Note

QC 20180917

Available from: 2018-09-17 Created: 2018-09-17 Last updated: 2019-08-20Bibliographically approved

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Skorodumova, NataliaPašti, Igor

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