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

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Varnell JA,Tse EC,Schulz CE,Fister TT,Haasch RT,Timoshenko J,Frenkel AI,Gewirth AA

doi

10.1038/ncomms12582

subject

Has Abstract

pub_date

2016-08-19 00:00:00

pages

12582

issn

2041-1723

pii

ncomms12582

journal_volume

7

pub_type

杂志文章

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