Performance of Fe−N/C oxygen reduction electrocatalysts toward NO2 −, NO, and NH2OH electroreduction: from fundamental insights into the active center to a new method for environmental nitrite destruction
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2016
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Journal of the American Chemical Society
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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.
Como referenciar
MALKO, DANIEL; KUCERNAK, ANTHONY; LOPES, THIAGO. Performance of Fe−N/C oxygen reduction electrocatalysts toward NO2 −, NO, and NH2OH electroreduction: from fundamental insights into the active center to a new method for environmental nitrite destruction. Journal of the American Chemical Society, v. 138, n. 49, p. 16056-16068, 2016. DOI: 10.1021/jacs.6b09622. Disponível em: http://repositorio.ipen.br/handle/123456789/27123. Acesso em: 19 Apr 2024.
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