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Title: Changes in Active Sites on Nitrogen‐Doped Carbon Catalysts Under Oxygen Reduction Reaction: A Combined Post‐Reaction Characterization and DFT Study

Journal Article · · ChemCatChem

Abstract Nitrogen‐doped carbon nanostructures (CN x ) have been shown to be promising catalysts to replace Pt‐based materials for oxygen reduction reaction (ORR) in PEM fuel cell cathodes. This work reports the use of a combination of post‐reaction X‐ray photoelectron spectroscopy (XPS) and density functional theory (DFT) aimed at examining changes to the nitrogen species in CN x after potential application in an oxygen saturated acidic electrolyte. The results hence obtained reveal interesting changes to the pyridinic, quaternary and pyridinic N + O binding energy envelopes as a result of protonation of sites and formation of ORR intermediates after the CN x electrodes were subjected to electrochemical potential holds in the kinetic and mass transfer limited regimes of the ORR cyclic voltammogram of the catalyst.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; FG02-07ER15896
OSTI ID:
1575295
Journal Information:
ChemCatChem, Journal Name: ChemCatChem Journal Issue: 24 Vol. 11; ISSN 1867-3880
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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