Novel carbonaceous ZnO composite prepared through inert-ambient pyrolysis of the zinc anthranilate complex

Raghavan, M Srinidhi and Shivashankar, S A (2019) Novel carbonaceous ZnO composite prepared through inert-ambient pyrolysis of the zinc anthranilate complex. In: MATERIALS RESEARCH EXPRESS, 6 (9).

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Abstract

In this work we present the analysis of products of the pyrolysis, at 600 degrees C, of zinc anthranilate complex in open air and in the nitrogen ambient of a sealed tube. The resulting powder samples were characterized by x-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (FESEM), and transmittance electron microscopy (HR-TEM). Open-air pyrolysis (OAP) yields well-crystallized ZnO, whereas sealed-tube pyrolysis (STP) produces a black powder that is found to be a composite (ZnO/C) of graphitic carbon and nanocrystalline, nearly monodisperse ZnO. The composite is carbon-rich. The relatively large size of ZnO crystallites from OAP and their much smaller size in the STP product suggest that carbon formation in the sealed tube restricts the growth of ZnO nanocrystals. When ZnO/C was annealed in air at 650 degrees C for 1 h, the oxide crystallites retained their average size, with all carbon removed. To investigate the possibility of using ZnO/C as electrode material in capacitors, electrochemical investigations electrode were carried out using cyclic voltammetry and galvanostatic charge-discharge, with 0.5 M KOH as electrolyte. The specific capacitance of the ZnO/C composite was found to be 124.7 F g(-1) at 5 mV s(-1) scan rate, indicating the suitability of ZnO/C as electrode material because of the measured voltammograms and charge-discharge characteristics.

Item Type:	Journal Article
Publication:	MATERIALS RESEARCH EXPRESS
Publisher:	IOP PUBLISHING LTD
Additional Information:	copyright for this article belongs to IOP PUBLISHING LTD
Keywords:	metal anthranilate complex; ZnO/C nanocomposite; carbonaceous metal oxide; cyclic voltammetry
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	05 Sep 2019 10:07
Last Modified:	05 Sep 2019 10:07
URI:	http://eprints.iisc.ac.in/id/eprint/63444

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