Performance of Fe-N/C oxygen reduction electrocatalysts towards NO−₂, NO, and NH₂OH electroreduction from fundamental insights into the active center to a new method for environmental nitrite destruction

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Title: Performance of Fe-N/C oxygen reduction electrocatalysts towards NO−₂, NO, and NH₂OH electroreduction from fundamental insights into the active center to a new method for environmental nitrite destruction
Author(s): Kucernak, A
Malko, D
Lopes, T
Item Type: Journal Article
Abstract: Although major progress has recently been achieved through ex situ methods, there is still a lack of understanding of the behavior of the active center in non-precious metal Fe–N/C catalysts under operating conditions. Utilizing nitrite, nitric oxide, and hydroxylamine as molecular probes, we show that the active site for the oxygen reduction reaction (ORR) is different under acidic and alkaline conditions. An in-depth investigation of the ORR in acid reveals a behavior which is similar to that of iron macrocyclic complexes and suggests a contribution of the metal center in the catalytic cycle. We also show that this catalyst is highly active toward nitrite and nitric oxide electroreduction under various pH values with ammonia as a significant byproduct. This study offers fundamental insight into the chemical behavior of the active site and demonstrates a possible use of these materials for nitrite and nitric oxide sensing applications or environmental nitrite destruction.
Publication Date: 13-Nov-2016
Date of Acceptance: 13-Nov-2016
URI: http://hdl.handle.net/10044/1/42613
DOI: https://dx.doi.org/10.1021/jacs.6b09622
ISSN: 1520-5126
Publisher: American Chemical Society
Start Page: 16056
End Page: 16068
Journal / Book Title: Journal of the American Chemical Society
Volume: 138
Issue: 49
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/J016454/1
Copyright Statement: © 2016 American Chemical Society. ACS AuthorChoice - This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Chemistry
MEMBRANE FUEL-CELLS
ACID ELECTROLYTE
CATHODE CATALYST
FE/N/C-CATALYSTS
ELECTROCHEMICAL REDUCTION
METAL ELECTROCATALYST
DISK ELECTRODE
O-2 REDUCTION
OXIDE
CARBON
General Chemistry
03 Chemical Sciences
Publication Status: Published
Appears in Collections:Chemistry
Faculty of Natural Sciences



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