NDLI: Tuning the electro-chemical properties by selectively substituting transition metals on carbon in Ni/Co oxide–carbon composite electrodes for supercapacitor devices

Content Provider	Royal Society of Chemistry (RSC)
Author	Panda, H. S. Sahoo, P. K. Kumar, Niraj
Copyright Year	2017
Abstract	Carbon black (CB) decorated Ni/Co oxide composite electrodes are fabricated in situ with variable CB percentages by using the successive ionic layer adsorption and reaction (SILAR) method. This green process tuned the metal ion concentration on carbon and offered binder-free, facile and scalable features. The structure, morphology and electrochemical performances of the developed nanocomposites are characterized using various sophisticated techniques. An elemental study suggested the substitution of more Ni2+ in NixCo1−xO4 with varying carbon concentrations, which was correlated with the change in the relaxation rate of the composites. X-ray photoelectron spectroscopy confirmed the presence of Ni2+ and Ni3+ in the Ni/Co–carbon composites, which are additionally responsible for improving the conductivity of the developed electrodes. Also, conductive atomic force microscopy supported the improvement in the local conductivity of NC7 compared to NC0. NC7 electrodes demonstrated a specific capacitance of around 1811 F g−1 at a current density of 0.5 mA cm−2 with excellent cyclic retention (92% even after 8000 cycles) and energy density (91 W h Kg−1). Further, NC7 electrodes are used to fabricate an asymmetric solid state supercapacitor device (capacitance around 258 F g−1), and are connected to a commercial solar cell for storing energy, which is effective to light a commercial LED.
Starting Page	3562
Ending Page	3573
Page Count	12
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	41
Issue Number	9
Journal	New Journal of Chemistry
DOI	10.1039/c6nj04123j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Carbon black Ion Energy density Photoemission spectroscopy Carbon Solar cell NC (complexity) SILAR Adsorption Electrochemistry Conductive atomic force microscopy Supercapacitor Capacitance Carabiner Electric current X-ray photoelectron spectroscopy
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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