Identification of carbon-encapsulated iron nanoparticles as active species in non-precious metal oxygen reduction catalysts View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2016-08-19

AUTHORS

Jason A. Varnell, Edmund C. M. Tse, Charles E. Schulz, Tim T. Fister, Richard T. Haasch, Janis Timoshenko, Anatoly I. Frenkel, Andrew A. Gewirth

ABSTRACT

The widespread use of fuel cells is currently limited by the lack of efficient and cost-effective catalysts for the oxygen reduction reaction. Iron-based non-precious metal catalysts exhibit promising activity and stability, as an alternative to state-of-the-art platinum catalysts. However, the identity of the active species in non-precious metal catalysts remains elusive, impeding the development of new catalysts. Here we demonstrate the reversible deactivation and reactivation of an iron-based non-precious metal oxygen reduction catalyst achieved using high-temperature gas-phase chlorine and hydrogen treatments. In addition, we observe a decrease in catalyst heterogeneity following treatment with chlorine and hydrogen, using Mössbauer and X-ray absorption spectroscopy. Our study reveals that protected sites adjacent to iron nanoparticles are responsible for the observed activity and stability of the catalyst. These findings may allow for the design and synthesis of enhanced non-precious metal oxygen reduction catalysts with a higher density of active sites. More... »

PAGES

12582

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/ncomms12582

DOI

http://dx.doi.org/10.1038/ncomms12582

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1045489446

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/27538720


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290 https://www.grid.ac/institutes/grid.258643.e schema:alternateName Knox College
291 schema:name Department of Physics, Knox College, Galesburg, Illinois 61401, USA
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293 https://www.grid.ac/institutes/grid.268433.8 schema:alternateName Yeshiva University
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296 https://www.grid.ac/institutes/grid.35403.31 schema:alternateName University of Illinois at Urbana Champaign
297 schema:name Department of Chemistry, University of Illinois at Urbana–Champaign, Urbana, Illinois 61801, USA
298 Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, USA
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