Ballai Gergő and Varga Tamás and Haspel Henrik and Kukovecz Ákos and Kónya Zoltán: Oxygen reduction activity of cobalt-nitride on nitrogen-doped graphene.
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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: | Conference or Workshop Item |
|---|---|
| Journal or Publication Title: | Proceedings of the International Symposium on Analytical and Environmental Problems |
| Date: | 2017 |
| Volume: | 23 |
| ISBN: | 978-963-306-563-1 |
| Page Range: | p. 372 |
| Event Title: | International Symposium on Analytical and Environmental Problems (23.) (2017) (Szeged) |
| Related URLs: | http://acta.bibl.u-szeged.hu/55894/ |
| Uncontrolled Keywords: | Környezetkémia - előadáskivonat |
| Date Deposited: | 2019. Jan. 02. 19:04 |
| Last Modified: | 2022. Aug. 08. 15:49 |
| URI: | http://acta.bibl.u-szeged.hu/id/eprint/56230 |
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