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Probing the influence of the center atom coordination structure in iron phthalocyanine multi-walled carbon nanotube-based oxygen reduction reaction catalysts by X-ray absorption fine structure spectroscopy
Peng, YX; Li, ZP; Xia, DG; Zheng, LR; Liao, Y; Li, K; Zuo, X; Zheng LR(郑黎荣)
2015
发表期刊JOURNAL OF POWER SOURCES
卷号291页码:20-28
文章类型Article
摘要Three different pentacoordinate iron phthalocyanine (FePc) electrocatalysts with an axial ligand (pyridyl group, Py) anchored to multi-walled carbon nanotubes (MWCNTs) are prepared by a microwave method as high performance composite electrocatalysts (FePc-Py/MWCNTs) for the oxygen reduction reaction (ORR). For comparison, tetracoordinate FePc electrocatalysts without an axial ligand anchored to MWCNTs (FePc/MWCNTs) are assembled in the same way. Ultraviolet-visible spectrophotometry (UV-Vis), Raman spectroscopy (RS), and high-resolution transmission electron microscopy (HRTEM) are used to characterize the obtained electrocatalysts. The electrocatalytic activity of the samples is measured by linear sweep voltammetry (LSV), and the onset potential of all of the FePc-Py/MWCNTs electrocatalysts is found to be more positive than that of their FePc/MWCNTs counterparts. X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) spectroscopy are employed to elucidate the relationship between molecular structure and electrocatalytic activity. XPS indicates that higher concentrations of Fe3+ and pyridine-type nitrogen play critical roles in determining the electrocatalytic ORR activity of the samples. XAFS spectroscopy reveals that the FePc-Py/MWCNTs electrocatalysts have a coordination geometry around Fe that is closer to the square pyramidal structure, a higher concentration of Fe3+, and a smaller phthalocyanine ring radius compared with those of FePc/MWCNTs. (C) 2015 Elsevier B.V. All rights reserved.
关键词iron-phthalocyanine Multi-walled carbon nanotubes Microwave synthesis Oxygen reduction reaction Pentacoordinate X-ray absorption fine structure spectroscopy
学科领域Electrochemistry; Energy & Fuels
DOI10.1016/j.jpowsour.2015.04.158
收录类别SCI ; EI
WOS类目Electrochemistry ; Energy & Fuels
WOS记录号WOS:000356746400003
引用统计
被引频次:14[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228387
专题多学科研究中心
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Peng, YX,Li, ZP,Xia, DG,et al. Probing the influence of the center atom coordination structure in iron phthalocyanine multi-walled carbon nanotube-based oxygen reduction reaction catalysts by X-ray absorption fine structure spectroscopy[J]. JOURNAL OF POWER SOURCES,2015,291:20-28.
APA Peng, YX.,Li, ZP.,Xia, DG.,Zheng, LR.,Liao, Y.,...&郑黎荣.(2015).Probing the influence of the center atom coordination structure in iron phthalocyanine multi-walled carbon nanotube-based oxygen reduction reaction catalysts by X-ray absorption fine structure spectroscopy.JOURNAL OF POWER SOURCES,291,20-28.
MLA Peng, YX,et al."Probing the influence of the center atom coordination structure in iron phthalocyanine multi-walled carbon nanotube-based oxygen reduction reaction catalysts by X-ray absorption fine structure spectroscopy".JOURNAL OF POWER SOURCES 291(2015):20-28.
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