Journal
APPLIED SURFACE SCIENCE
Volume 428, Issue -, Pages 148-153Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.09.130
Keywords
FeCo2S4; Array; Ni foam; Supercapacitor
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Funding
- National Natural Science Foundation of China [21171174, 21505035]
- Provincial Natural Science Foundation of Hunan [2015JJ4035, 2016JJ3028]
- Key Scientific Research Fund of Hunan Provincial Science and Technology [2011GK2014]
- Hunan Provincial Science and Technology Plan Project [2016TP1007]
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Spinel FeCo2S4 nanoflower arrays grown on Ni foam (FeCo2S4@Ni) have been successfully fabricated via a facile hydrothermal sulfurization of the corresponding FeCo2O4 precursor. The results of X-ray diffraction and X-ray photoelectron spectroscopy characterizations affirm that partial Co2+/Co3+ ions in Co3S4 have been substituted by Fe2+/Fe3+ ions to form FeCo2S4. The obtained FeCo2S4@Ni exhibits an ultrahigh specific capacitance (1644.07 mF cm(-2) at 50 mA cm(-2)) and a supreme cycling stability (similar to 100% after 10,000 cycles at 50 mA cm(-2)) as binder-free electrodes for supercapacitors. The cycling stability of the fabricated product is the highest among the documented ternary metallic sulfides so far. The excellent supercapacitive performance of FeCo2S4@Ni emanates from the unique architectures of Fe2Co2S4 nanoflower arrays constituted by ultrathin nanoflakes, three-dimensional porous and conductive Ni foam, and solid skeleton of Ni foam for robust connections to the Fe2Co2S4. (C) 2017 Elsevier B.V. All rights reserved.
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