Triethanolamine–ethoxylate (TEA-EO) assisted hydrothermal synthesis of hierarchical β-MnO2 nanorods: effect of surface morphology on capacitive performance. (22nd November 2021)

• Record Type: Journal Article
• Authors: Kumar, Yogesh; Uke, S J; Kumar, Ashwani; Merdikar, S P; Gupta, Meenal; Thakur, A K; Bocchetta, P; Gupta, Anshu; Kumar, Vinay; Kumar, Yogesh
• Is Part Of: Nano express. Volume 2:Number 4(2021)
• Publication Date: 2021-11-22
• Subjects: MnO2 nanorods -- nanorod thickness -- nanostructured surface area -- Rietveld refinement -- supercapacitors; Nanotechnology -- Periodicals; Nanoscience -- Periodicals; 620.5
• DOI: 10.1088/2632-959X/abef21
• Languages: English
• ISSNs: 2632-959X

Abstract

Abstract: In this study we are presenting the synthesis of MnO2 nanorods using hydrothermal method assisted by facile tri-ethanolamine-ethoxylate. Structural (x-ray diffraction, Rietveld refinement), functional (Fourier Transform Infrared spectroscopy and x-ray Photoelectron Spectroscopy) and morphological (Field emission scanning electron microscope, Transmission electron microscopy) characterization conform the β -MnO2 nanostructure with a rod-like morphology and uniform thickness. The morphological variations of the nanorod thickness can be easily controlled by simply monitoring the reaction temperature. Comparative investigations of β -MnO2 samples synthesized at two different reaction temperatures (viz. 100 °C and 120 °C) used as a supercapacitive electrode material have been performed with the aid of different electrochemical techniques. With different electrolytes (Li2 SO4 and Na2 SO4 ), supercapacitor device is tested using Cyclic voltammetry, impedance spectroscopy and galvanostatic charge discharge. Interestingly, the low temperature synthesized β -MnO2 nanorods sample exhibit superior electrochemical performance in 1 mol l −1 Li2 SO4 electrolyte in terms of high specific capacitance (462 Fg −1 at10 mVs −1 ), energy density (9.72 WhKg −1 ), and outstanding cyclic stability (90.26% over 2000 cycles).