Structural and Morphological Studies of Bi2O3/MWCNTs Doped Reduced Graphene Oxide for Energy Storage Applications. (1st March 2022)

• Record Type: Journal Article
• Authors: Surekha, G.; Ravi, N.; Suvarna, R. Padma; Krishnaiah, Kummara Venkata
• Is Part Of: ECS journal of solid state science and technology. Volume 11:Number 3(2022)
• Publication Date: 2022-03-01
• Subjects: Solid state chemistry -- Periodicals; Electronics -- Materials -- Periodicals; Electrochemistry -- Periodicals; 541.0421
• DOI: 10.1149/2162-8777/ac5eb5
• Languages: English
• ISSNs: 2162-8777

Abstract

Abstract : Bismuth oxide (Bi2 O3 ), multi-wall carbon nanotubes (MWCNTs), reduced graphene oxide (rGO) and its composite were synthesized by modified Hummers method followed by chemical and thermal reduction processes. During synthesis, graphene oxide (GO) was reduced to rGO and decorated evenly with Bi2 O3 and CNTs. Average crystallite size of graphite flakes (GF), GO, rGO, rGO/Bi2 O3, rGO/CNTs and rGO/Bi2 O3 /CNTs is calculated from XRD profiles using the Scherer equation are 77.75, 11.91, 1.79, 18.1, 21.05 and 18.05 nm, respectively. In XRD, deconvolution of rGO/Bi2 O3 /CNTs, C60 and C70 diffraction peaks were observed. The morphology of rGO/Bi2 O3 /CNTs have smoother surface similar to GO, rGO, rGO/Bi2 O3 and rGO/CNTs except GF, was revealed in SEM images. HR-TEM analysis revealed carbon (002) in rGO with d -spacing of 0.34 nm, Bi (102) with d -spacing of 0.31 nm and MWCNTs on 2 nm scale. Bonding of Bi2 O3 and CNTs with graphene layers led to the formation of novel functionalized nanocomposite which enhances electrical conductivity of rGO. Using AFM images of rGO/CNTs films thicknesses, arithmetic mean and RMS roughness were estimated as 6 nm at 14.91 nm and 19.27 nm, respectively. Results of rGO/Bi2 O3 /CNTs revealed that with the small crystallite size, functionalization and nanoscale roughness could be promising for energy storage applications.