Visualizing electronic interactions between iron and carbon by X-ray chemical imaging and spectroscopy

Xiaoqi Chen, Jianping Xiao, Jian Wang, Dehui Deng, Yongfeng Hu, Jigang Zhou, Liang Yu, Thomas Heine, Xiulian Pan, Xinhe Bao

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31 Citations (Scopus)

Abstract

The electronic interaction of a catalyst and its support is of vital importance to its catalytic performance. However, it is still a great challenge to directly probe the interaction due to the lack of well-defined models and efficient technical means. In this study, we report that pod-like carbon nanotubes with encapsulated iron particles (Pod-Fe) and scanning transmission X-ray microscopy (STXM) can be used as an ideal model and technique to study the electronic interaction between carbon shells and iron particles. The chemical imaging and spectroscopy of Pod-Fe by STXM show that the local electronic structures at C K-edge near edge (π∗) of carbon shells can be significantly modified by the encapsulated iron particles, which promotes the adsorption of oxygen-containing species, and thereby further modifies the electronic structure (π∗ and σ∗) of the carbon shells. Moreover, computed X-ray absorption near edge structure spectra (XANES) confirmed the electronic modifications of carbon shells by the encapsulated iron particles. The present study provides a direct evidence of electronic interactions with simultaneously collected images and spectra, which can promote the understanding towards the nature of active sites and supports.

Original languageEnglish
Pages (from-to)3262-3267
Number of pages6
JournalChemical Science
Volume6
Issue number5
DOIs
Publication statusPublished - 2015 May 1

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

Chen, X., Xiao, J., Wang, J., Deng, D., Hu, Y., Zhou, J., Yu, L., Heine, T., Pan, X., & Bao, X. (2015). Visualizing electronic interactions between iron and carbon by X-ray chemical imaging and spectroscopy. Chemical Science, 6(5), 3262-3267. https://doi.org/10.1039/c5sc00353a