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Cobalt boride modified with N-doped carbon nanotubes as a high-performance bifunctional oxygen electrocatalyst
Elumeeva, Karina (Ruhr-Universität Bochum (Alemanya))
Masa, Jistis (Ruhr-Universität Bochum (Alemanya))
Medina, Danea (Ruhr-Universität Bochum (Alemanya))
Ventosa, Edgar (Ruhr-Universität Bochum (Alemanya))
Seisel, Sabine (Ruhr-Universität Bochum (Alemanya))
Kayran, Yasin Ugur (Ruhr-Universität Bochum (Alemanya))
Genç, Aziz (Institut Català de Nanociència i Nanotecnologia)
Bobrowski, Tim (Ruhr-Universität Bochum (Alemanya))
Weide, Philippe (Ruhr-Universität Bochum (Alemanya))
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Muhler, Martin (Ruhr-Universität Bochum (Alemanya))
Schuhmann, Wolfgang (Ruhr-Universität Bochum (Alemanya))

Date: 2017
Abstract: The development of reversible oxygen electrodes, able to drive both the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR), is still a great challenge. We describe a very efficient and stable bifunctional electrocatalytic system for reversible oxygen electrodes obtained by direct CVD growth of nitrogen-doped carbon nanotubes (NCNTs) on the surface of cobalt boride (CoB) nanoparticles. A detailed investigation of the crystalline structure and elemental distribution of CoB before and after NCNT growth reveals that the NCNTs grow on small CoB nanoparticles formed in the CVD process. The resultant CoB/NCNT system exhibited outstanding activity in catalyzing both the OER and the ORR in 0. 1 M KOH with an overvoltage difference of only 0. 73 V between the ORR at -1 mA cm⁻² and the OER at +10 mA cm⁻². The proposed CoB/NCNT catalyst showed stable performance during 50 h of OER stability assessment in 0. 1 M KOH. Moreover, CoB/NCNT spray-coated on a gas diffusion layer as an air-breathing electrode proved its high durability during 170 galvanostatic charge-discharge (OER/ORR) test cycles (around 30 h) at ±10 mA cm⁻² in 6 M KOH, making it an excellent bifunctional catalyst for potential Zn-air battery application.
Note: Número d'acord de subvenció MINECO/MAT2014-59961-C2-2-R
Note: Número d'acord de subvenció MINECO/SEV2013-0295
Note: Número d'acord de subvenció AGAUR/2014/SGR-1638
Rights: Tots els drets reservats.
Language: Anglès.
Document: article ; recerca ; acceptedVersion
Subject: Bi-functional catalysts ; Crystalline structure ; Electrocatalytic system ; Elemental distribution ; Galvanostatic charge discharges ; Nitrogen doped carbon nanotubes ; Oxygen evolution reaction ; Oxygen reduction reaction
Published in: Journal of materials chemistry A, Vol. 5, issue 40 (Oct. 2017) , p. 21122-21129, ISSN 2050-7496

DOI: 10.1039/c7ta06995b


Postprint
29 p, 1.3 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles

 Record created 2018-07-25, last modified 2019-03-29



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