In:
ChemElectroChem, Wiley, Vol. 1, No. 5 ( 2014-05-13), p. 877-884
Abstract:
It is shown that iron–nitrogen (Fe/N) coordination in an Fe/N‐modified graphene (Fe/N‐graphene) electrocatalyst catalyzes a four‐electron transfer oxygen reduction reaction (ORR). The Fe/N‐graphene is synthesized by heat‐treating graphene oxides in the presence of an Fe/N complex at 900 °C for just 45 s. When the heat‐treatment period is increased, the Fe/N coordination bonds are broken and the number of electrons involved in the ORR decreases. Extended X‐ray absorption fine structure analysis and X‐ray absorption spectroscopy (XAS) show that both a complete sp 2 graphitic structure and a high density of Fe/N coordination structures exist in the Fe/N‐graphene material, which is in contrast to the carbon‐based catalyst prepared by using the conventional pyrolysis method. XAS analysis also reveals that back‐donation from Fe atoms coordinated with N to an O antibonding π* orbital occurrs, promoting the four‐electron transfer ORR.
Type of Medium:
Online Resource
ISSN:
2196-0216
,
2196-0216
DOI:
10.1002/celc.201300181
Language:
English
Publisher:
Wiley
Publication Date:
2014
detail.hit.zdb_id:
2724978-5
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