In-situ electrochemical quantification of active sites in Fe-N/C non-precious metal catalysts

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Title: In-situ electrochemical quantification of active sites in Fe-N/C non-precious metal catalysts
Author(s): Malko, D
Kucernak, A
Lopes, T
Item Type: Journal Article
Abstract: The economic viability of low temperature fuel cells as clean energy devices is enhanced by the development of inexpensive oxygen reduction reaction catalysts. Heat treated iron and nitrogen containing carbon based materials (Fe–N/C) have shown potential to replace expensive precious metals. Although significant improvements have recently been made, their activity and durability is still unsatisfactory. The further development and a rational design of these materials has stalled due to the lack of an in situ methodology to easily probe and quantify the active site. Here we demonstrate a protocol that allows the quantification of active centres, which operate under acidic conditions, by means of nitrite adsorption followed by reductive stripping, and show direct correlation to the catalytic activity. The method is demonstrated for two differently prepared materials. This approach may allow researchers to easily assess the active site density and turnover frequency of Fe–N/C catalysts.
Publication Date: 31-Oct-2016
Date of Acceptance: 1-Sep-2016
URI: http://hdl.handle.net/10044/1/39810
DOI: https://dx.doi.org/10.1038/ncomms13285
ISSN: 2041-1723
Publisher: Nature Publishing Group
Journal / Book Title: Nature Communications
Volume: 7
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/J016454/1
EP/K503381/1
Copyright Statement: © 2016 The Authors. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: MD Multidisciplinary
Publication Status: Published
Article Number: ARTN 13285
Appears in Collections:Chemistry
Faculty of Natural Sciences



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