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Oxygen reduction reaction mechanism and kinetics on M-NxCy and M@N-C active sites present in model M-N-C catalysts under alkaline and acidic conditions

  • Ricardo Sgarbi
  • Kavita Kumar
  • Frédéric JaouenEmail author
  • Andrea Zitolo
  • Edson A. Ticianelli
  • Frédéric MaillardEmail author
Original Paper
  • 95 Downloads

Abstract

M-N-C electrocatalysts (where M is Fe or Co) have been investigated for mitigating the dependence on noble metals when catalyzing the oxygen reduction reaction (ORR) for fuel cell technologies in acidic or alkaline conditions. Rotating disk and rotating ring-disk electrode measurements for Fe-N-C and Co-N-C catalysts demonstrate promising performances and stability for the ORR, while the activity of main suspected active sites (M-NxCy and M@N-C) has been discussed on the basis of the known physical-chemical properties of the catalysts in acid and alkaline media. Thereupon, it is observed that atomically dispersed Fe-NxCy sites reach the highest ORR activity in acid media when amplified by an adequate energy binding between the metallic center and the oxygenated reaction intermediates. In contrast, Fe@N-C core-shell sites reach a maximum ORR mass activity in alkaline media through a synergistic effect involving catalyst particles with metallic iron in the core and nitrogen-doped carbon in the shell.

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Graphical Abstract

Keywords

Fe-N-C catalyst Co-N-C catalyst PGM-free catalysts Alkaline exchange membrane fuel cell Proton exchange membrane fuel cell 

Notes

Acknowledgments

The Synchrotron SOLEIL (Gif-sur Yvette, France) is acknowledged for provision of synchrotron radiation facilities at beamline SAMBA (Proposal No. 20171318). We also acknowledge Qingying Jia (Northeastern University, Boston, USA) for providing the EXAFS spectrum of Fe3C.

Funding information

This study was financially supported by the French National Research Agency through the CAT2CAT and ANIMA projects, the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Brazil (process number: 1614344), CAPES/COFECUB program (process numbers: 88887-187755/2018-00 and Ph-C 914/18), and the São Paulo State Research Foundation (FAPESP – process number: 2013/16930-7).

Supplementary material

10008_2019_4436_MOESM1_ESM.docx (145 kb)
ESM 1 (DOCX 145 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Instituto de Química de São CarlosUniversidade de São PauloSao CarlosBrazil
  2. 2.Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, Grenoble INP, LEPMIGrenobleFrance
  3. 3.CNRS, Université de Montpellier, ENSCMUMR 5253 Institut Charles Gerhardt MontpellierMontpellierFrance
  4. 4.Synchrotron SOLEIL, L’orme des MerisiersGif-sur-YvetteFrance

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