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  P-block single-metal-site tin/nitrogen-doped carbon fuel cell cathode catalyst for oxygen reduction reaction

Luo, F., Roy, A. J., Silvioli, L., Cullen, D. A., Zitolo, A., Sougrati, M. T., et al. (2020). P-block single-metal-site tin/nitrogen-doped carbon fuel cell cathode catalyst for oxygen reduction reaction. Nature Materials, 19(11), 1215-1223. doi:10.1038/s41563-020-0717-5.

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 Creators:
Luo, Fang1, Author
Roy, Aaron J.2, Author
Silvioli, Luca3, 4, Author
Cullen, David A.5, Author
Zitolo, Andrea6, Author
Sougrati, M. T.2, Author
Oǧuz, Ismail Can2, Author
Mineva, Tsonka2, Author
Teschner, Detre7, 8, Author           
Wagner, Stephan9, Author
Wen, Ju1, Author
Dionigi, Fabio1, Author
Kramm, Ulrike Ingrid9, Author
Rossmeisl, Jan3, Author
Jaouen, Frédéric2, Author
Strasser, Peter1, Author
Affiliations:
1Department of Chemistry, The Electrochemical Energy, Catalysis and Material Science Laboratory, Chemical Engineering Division, Technical University Berlin, Berlin, Germany, ou_persistent22              
2ICGM, Univ. Montpellier, CNRS, ENSCM, Montpellier, France, ou_persistent22              
3Nano-Science Center, Department of Chemistry, University Copenhagen, Copenhagen, Denmark, ou_persistent22              
4Seaborg Technologies, Copenhagen, Denmark, ou_persistent22              
5Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, United States, ou_persistent22              
6Synchrotron SOLEIL, L’orme des Merisiers, BP 48, Saint Aubin, Gif-sur-Yvette, France, ou_persistent22              
7Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
8Department of Heterogeneous Reaction, Max-Planck-Institute for Chemical Energy Conversion, Berlin, Germany, ou_persistent22              
9Department of Chemistry and Department of Materials and Earth Sciences, Graduate School of Excellence Energy Science and Engineering, Technical University Darmstadt, Darmstadt, Germany, ou_persistent22              

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 Abstract: This contribution reports the discovery and analysis of a p-block Sn-based catalyst for the electroreduction of molecular oxygen in acidic conditions at fuel cell cathodes; the catalyst is free of platinum-group metals and contains single-metal-atom actives sites coordinated by nitrogen. The prepared SnNC catalysts meet and exceed state-of-the-art FeNC catalysts in terms of intrinsic catalytic turn-over frequency and hydrogen–air fuel cell power density. The SnNC-NH3 catalysts displayed a 40–50% higher current density than FeNC-NH3 at cell voltages below 0.7 V. Additional benefits include a highly favourable selectivity for the four-electron reduction pathway and a Fenton-inactive character of Sn. A range of analytical techniques combined with density functional theory calculations indicate that stannic Sn(iv)Nx single-metal sites with moderate oxygen chemisorption properties and low pyridinic N coordination numbers act as catalytically active moieties. The superior proton-exchange membrane fuel cell performance of SnNC cathode catalysts under realistic, hydrogen–air fuel cell conditions, particularly after NH3 activation treatment, makes them a promising alternative to today’s state-of-the-art Fe-based catalysts.

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Language(s): eng - English
 Dates: 2020-02-282020-05-252020-07-132020-11
 Publication Status: Issued
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41563-020-0717-5
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Title: Nature Materials
  Abbreviation : Nat. Mater.
Source Genre: Journal
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Publ. Info: London, UK : Nature Pub. Group
Pages: 10 Volume / Issue: 19 (11) Sequence Number: - Start / End Page: 1215 - 1223 Identifier: ISSN: 1476-1122
CoNE: https://pure.mpg.de/cone/journals/resource/111054835734000