Improved electrochemical performance of Fe-N-C catalysts through ionic liquid modification in alkaline media

Martinaiou, Ioanna and Wolker, Thomas and Shahraei, Ali and Zhang, Gui-Rong and Janßen, Arne and Wagner, Stephan and Weidler, Natascha and Stark, Robert W. and Etzold, Bastian J. M. and Kramm, Ulrike I. :
Improved electrochemical performance of Fe-N-C catalysts through ionic liquid modification in alkaline media.
[Online-Edition: https://doi.org/10.1016/j.jpowsour.2017.07.028]
In: Journal of Power Sources, 375 pp. 222-232. ISSN 03787753
[Article] , (2018)

Official URL: https://doi.org/10.1016/j.jpowsour.2017.07.028

Abstract

It is well known that Fe-N-C catalysts reach a significantly better ORR activity in alkaline compared to acidic electrolyte. This advantage makes the material of interest for application in alkaline fuel cells. Beside this, for Pt/C catalyst it is known that the performance in acid can be significantly enhanced through ionic liquid modification following the Solid Catalysts with Ionic Liquid Layer (SCILL) concept. In our current study we combine both advantages and investigate for two Fe-N-C catalysts prepared either with or without sulfur in the precursor mixture the effect of IL modification. The unmodified catalysts are characterized using X-ray induced photoelectron spectroscopy (XPS), 57Fe Mößbauer and Raman spectroscopy as well as N2 sorption. The electrochemical behavior of the unmodified catalyst and with different pore-filling degrees of ionic liquid (IL) is analysed with respect to double layer capacitance, ORR activity and stability in accelerated stress tests mimicking the load-cycle conditions.

Item Type:	Article
Erschienen:	2018
Creators:	Martinaiou, Ioanna and Wolker, Thomas and Shahraei, Ali and Zhang, Gui-Rong and Janßen, Arne and Wagner, Stephan and Weidler, Natascha and Stark, Robert W. and Etzold, Bastian J. M. and Kramm, Ulrike I.
Title:	Improved electrochemical performance of Fe-N-C catalysts through ionic liquid modification in alkaline media
Language:	English
Abstract:	It is well known that Fe-N-C catalysts reach a significantly better ORR activity in alkaline compared to acidic electrolyte. This advantage makes the material of interest for application in alkaline fuel cells. Beside this, for Pt/C catalyst it is known that the performance in acid can be significantly enhanced through ionic liquid modification following the Solid Catalysts with Ionic Liquid Layer (SCILL) concept. In our current study we combine both advantages and investigate for two Fe-N-C catalysts prepared either with or without sulfur in the precursor mixture the effect of IL modification. The unmodified catalysts are characterized using X-ray induced photoelectron spectroscopy (XPS), 57Fe Mößbauer and Raman spectroscopy as well as N2 sorption. The electrochemical behavior of the unmodified catalyst and with different pore-filling degrees of ionic liquid (IL) is analysed with respect to double layer capacitance, ORR activity and stability in accelerated stress tests mimicking the load-cycle conditions.
Journal or Publication Title:	Journal of Power Sources
Volume:	375
Publisher:	Elsevier Science Publishing
Uncontrolled Keywords:	Fe-N-C catalyst, Oxygen reduction reaction, SCILL, Ionic liquid modification, Non-PGM catalyst
Divisions:	11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Catalysts and Electrocatalysts 11 Department of Materials and Earth Sciences > Material Science > Physics of Surfaces 07 Fachbereich Chemie 07 Fachbereich Chemie > Fachgebiet Makromolekulare Chemie
Date Deposited:	06 Jul 2018 12:22
DOI:	10.1016/j.jpowsour.2017.07.028
Official URL:	https://doi.org/10.1016/j.jpowsour.2017.07.028
Funders:	Financial supports by the German research foundation via the Graduate School of Excellence Energy Science and Engineering (GSC1070) is gratefully acknowledged., Financial support by the federal ministry of education and research via the joint project NUKFER (05K16RD1) is gratefully acknowledged., Financial support by the NanoMatFutur young researcher group (03XP0092) are gratefully acknowledged by UIK and her group., TW, GRZ and BE acknowledge that this project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement No 681719).
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