Journal
APPLIED SURFACE SCIENCE
Volume 466, Issue -, Pages 830-836Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2018.10.015
Keywords
Cobalt sulfide; CNT; OER and EIS
Categories
Funding
- Department of Science and Technology - Science and Engineering Research Board, India [PDF/2016/000859, EMR/2016/005888]
- DST-FIST [SR/FST/CST-266/2015(c)]
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In this work, a nanocomposite of CoS reinforced with functionalized multiwalled carbon nanotubes (MWCNTs) has been prepared using ultrasonication and complexation. Further, CoS/CNT composite was studied by X-ray diffraction studies, Field-emission scanning electron microscopy and X-ray photoelectron spectroscopy to study the crystallinity, surface morphology, chemical composition and chemical states respectively. Electrochemical studies show the appearance of reversible redox peaks, indicating a pseudocapacitive nature of CoS/CNT nanocomposite electrodes. The electrochemical measurements show that CoS/CNT nanocomposite electrode is catalytically more active for oxygen evolution reaction (OER) with an overpotential of 347 mV and a current density of 15 mA/cm(2) (Tafel slope of 142 mV/decade) in alkaline solution. The low charge transfer resistance and high double layer capacitance of CoS/CNT studied using electrochemical impedance spectroscopy. The stability and amperometry studies also confirmed that CoS/CNT nanocomposite is able to maintain excellent performance even after 500 cycles without any degradation.
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