Oxygen reduction activity of cobalt-nitride on nitrogen-doped graphene

Ballai, Gergő and Varga, Tamás and Haspel, Henrik and Kukovecz, Ákos and Kónya, Zoltán: Oxygen reduction activity of cobalt-nitride on nitrogen-doped graphene. Proceedings of the International Symposium on Analytical and Environmental Problems, (23). p. 372. (2017)

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Abstract

Fuel cells technology can offer suitable alternatives to replace one of the most important environmental issues of our days, i.e., fossil fuels. In the last decades, non-precious metal catalysts came in the view such as transition metal-oxides, -nitrides, or even metal free catalysts like N-graphene. Such systems are expected to replace high cost oxygen reduction reaction (ORR) catalysts used nowadays [1]. We hereby demonstrate a simple method for the simultaneous synthesis of cobalt-nitride nanoparticles on nitrogen-doped graphene support. The reported non-precious metal catalyst showed high electrocatalytic activity in ORR, and thus it is a promising alternative cathode-side catalyst in polymer electrolyte membrane (PEM) fuel cells. The catalyst was synthesized from lyophilized graphene-oxide and cobalt(II)-acetate in NH3 flow at high temperature, and the effect of cobalt-nitride amount on catalyst properties was further examined. To this end, transmission electron microscopy (TEM) and X-ray diffractometry (XRD) were employed to monitor the morphological and structural changes in the graphene sheets and the supported cobalt-nitride particles. The electrochemical properties of the catalyst were investigated in a three-electrode cell in oxygen saturated 0.1 M potassiumhydroxide solution at different rotation rates with a rotating disk electrode (RDE) setup. The optimal amount of cobalt-nitride and nitrogen-doped graphene was determined, producing a promising non-precious metal catalyst for oxygen reduction reaction.

Item Type: Article
Journal or Publication Title: Proceedings of the International Symposium on Analytical and Environmental Problems
Date: 2017
Volume: 23
Page Range: p. 372
ISBN: 978-963-306-563-1
Uncontrolled Keywords: Környezetkémia - előadáskivonat
Date Deposited: 2019. Jan. 02. 19:04
Last Modified: 2019. Jan. 02. 19:04
URI: http://acta.bibl.u-szeged.hu/id/eprint/56230

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