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05.06.2019 | Energy materials

Electrocatalysts for oxygen reduction reaction based on electrospun polyacrylonitrile, styrene–acrylonitrile copolymer and carbon nanotube composite fibres

verfasst von: Marek Mooste, Elo Kibena-Põldsepp, Viktoria Vassiljeva, Maido Merisalu, Mati Kook, Alexey Treshchalov, Vambola Kisand, Mai Uibu, Andres Krumme, Väino Sammelselg, Kaido Tammeveski

Erschienen in: Journal of Materials Science | Ausgabe 17/2019

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Abstract

In this work, polyacrylonitrile (PAN), styrene–acrylonitrile copolymer (SAN) and multi-walled carbon nanotubes (MWCNTs) composite fibres (PAN/SAN/CNT) were prepared by electrospinning. The electrospun fibres were further pyrolysed (800–1200 °C) in N₂ atmosphere with or without prior stabilisation (at 250 °C) in air to produce electrocatalyst materials for oxygen reduction reaction (ORR). The ORR was studied in alkaline solution by linear sweep voltammetry and rotating disc electrode (RDE) method. Scanning electron microscopy images revealed the tubular structure of the pyrolysed PAN/SAN/CNT fibres with visible MWCNTs. According to the X-ray photoelectron spectroscopy results, the prepared catalysts consisted of carbon, oxygen and nitrogen. According to the RDE results, the most active catalyst towards the ORR (the onset and half-wave potential of − 0.13 V and −0.29 V vs SCE in 0.1 M KOH, respectively) was obtained by pyrolysing non-stabilised PAN/SAN/CNT fibres at 1100 °C. The ORR activity of the best performing catalyst is attributed to the nitrogen species, quinone groups and porous tubular structure of the catalyst material.

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Titel: Electrocatalysts for oxygen reduction reaction based on electrospun polyacrylonitrile, styrene–acrylonitrile copolymer and carbon nanotube composite fibres
verfasst von: Marek Mooste
Elo Kibena-Põldsepp
Viktoria Vassiljeva
Maido Merisalu
Mati Kook
Alexey Treshchalov
Vambola Kisand
Mai Uibu
Andres Krumme
Väino Sammelselg
Kaido Tammeveski
Publikationsdatum: 05.06.2019
Verlag: Springer US
Erschienen in: Journal of Materials Science / Ausgabe 17/2019
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-019-03725-z

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