Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 138, Issue 49, Pages 16056-16068Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b09622
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Funding
- U.K. Engineering and Physical Sciences research council [EP/J016454/1]
- Sao Paulo Research Foundation [2016/07848-3, 2014/50279-4, 2014/09087-4]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [16/07848-3, 14/09087-4] Funding Source: FAPESP
- Engineering and Physical Sciences Research Council [EP/J016454/1] Funding Source: researchfish
- EPSRC [EP/J016454/1] Funding Source: UKRI
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Although major progress has recently been achieved through ex situ methods, there is still a lack of understanding of the 7 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.
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