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Issue 30, 2014
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Fe–N bonding in a carbon nanotube–graphene complex for oxygen reduction: an XAS study

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Abstract

The electronic structure study of carbon nanotube–graphene complexes has been performed using comprehensive X-ray absorption spectroscopy (XAS) at Fe L- and K-edges, along with C, N and O K-edges. The results obtained from the study of an iron-containing carbon nanotube–graphene complex (NT–G) have been compared in great detail with those of an iron-free carbon nanotube–graphene complex (pNT–G) and iron phthalocyanine (FePc). It has been confirmed that complex-like Fe3+ in a high spin state is the major iron component in NT–G. The C and N K-edge XANES further confirmed that Fe is very likely to be bonded to N in NT–G. This Fe–N species should be the active site for enhanced oxygen reduction reaction (ORR) activity in NT–G. A unique O K-edge X-ray absorption spectroscopic feature has been observed in NT–G, which might be caused by chemisorbed O2 on the Fe–N site. Such knowledge is important for the understanding of this specific complex, and the knowledge should benefit the rational design of other carbon/metal/nitrogen-containing ORR catalysts with further improved performance.

Graphical abstract: Fe–N bonding in a carbon nanotube–graphene complex for oxygen reduction: an XAS study

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Publication details

The article was received on 03 Apr 2014, accepted on 12 Jun 2014 and first published on 18 Jun 2014


Article type: Communication
DOI: 10.1039/C4CP01455C
Citation: Phys. Chem. Chem. Phys., 2014,16, 15787-15791
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    Fe–N bonding in a carbon nanotube–graphene complex for oxygen reduction: an XAS study

    J. Zhou, P. N. Duchesne, Y. Hu, J. Wang, P. Zhang, Y. Li, T. Regier and H. Dai, Phys. Chem. Chem. Phys., 2014, 16, 15787
    DOI: 10.1039/C4CP01455C

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