Study on charge storage mechanism in working electrodes fabricated by sol-gel derived spinel NiMn2O4 nanoparticles for supercapacitor application

Ray, Apurba and Roy, Atanu and Ghosh, Monalisa and Alberto Ramos-Ramon, Jesus and Saha, Samik and Pal, Umapada and Bhattacharya, Swapan Kumar and Das, S (2019) Study on charge storage mechanism in working electrodes fabricated by sol-gel derived spinel NiMn2O4 nanoparticles for supercapacitor application. In: APPLIED SURFACE SCIENCE, 463 . pp. 513-525.

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Abstract

We report the synthesis of porous spinel-structured binary NiMn2O4 metal oxide nanoparticles and their performance as electrode material for supercapacitors. Spherical NiMn2O4 nanoparticles of similar to 8 nm average diameter have been synthesized using inexpensive and simple sol-get method, and characterized by X-ray diffraction, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The electrodes made of this single phase spinel nanoparticles exhibit superior electrochemical performance with excellent rate capability, offering highest specific capacitance value of 875 F g(-1) at 2.0 mV s(-1) scan rate in 1M Na2SO4 electrolyte solution. Furthermore, an asymmetric supercapacitor is also assembled and possesses a wide operating voltage window of 1.8 V, exhibiting an energy density of 75.01 Wh kg(-1) at a power density of 2250.91 W kg(-1). The results infer this highly porous binary metal oxide nanostructures are promising candidates for high performance energy storage applications.

Item Type:	Journal Article
Publication:	APPLIED SURFACE SCIENCE
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	Copyright of this article belongs to ELSEVIER SCIENCE BV
Keywords:	EIS; Electrode material; Energy storage; NiMn2O4 nanoparticle; Supercapacitor
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	10 Feb 2019 09:00
Last Modified:	05 Mar 2019 06:55
URI:	http://eprints.iisc.ac.in/id/eprint/61341

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