In situ electrochemical quantification of active sites in Fe–N/C non-precious metal catalysts
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Resumo
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.
Como referenciar
MALKO, DANIEL; KUCERNAK, ANTHONY; LOPES, THIAGO. In situ electrochemical quantification of active sites in Fe–N/C non-precious metal catalysts. Nature Communications, v. 7, p. 1-7, 2016. DOI: 10.1038/ncomms13285. Disponível em: http://repositorio.ipen.br/handle/123456789/27122. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.