Ball‐milling route to design hierarchical nanohybrid cobalt oxide structures with cellulose nanocrystals interface for supercapacitors. (9th February 2022)

• Record Type: Journal Article
• Authors: Palem, Ramasubba Reddy; Shimoga, Ganesh; Rabani, Iqra; Bathula, Chinna; Seo, Young‐Soo; Kim, Hyun‐Seok; Kim, Sang‐Youn; Lee, Soo‐Hong
• Is Part Of: International journal of energy research. Volume 46:Number 6(2022)
• Page Start: 8398
• Page End: 8412
• Publication Date: 2022-02-09
• Subjects: ball‐milling -- cellulose nanocrystal -- cobalt oxide -- hierarchical nanostructure -- supercapacitor; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.7744
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: Nanocellulose materials are promising sustainable and environmentally friendly candidates for green and renewable energy storage applications. Herein, hierarchical Co3 O4 @CNC nanohybrid structure was fabricated in conjunction with cobalt acetate tetrahydrate and cellulose nanocrystals (CNC) as a bio‐carbon source using green ball‐milling pathway for the first time. For comparison, pristine Co3 O4 nanostructure was prepared using a similar method without adding CNC. The structural and morphological characteristics of nanohybrid composites were investigated using X‐ray diffractometer (XRD), Raman, X‐ray photoelectron spectroscopy (XPS), Fourier‐transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Brunauer‐Emmett‐Teller (BET) techniques. Furthermore, the electrochemical properties of the nanohybrid composites evaluated using cyclic voltammetry (CV), Galvanostatic Charge‐Discharge (GCD), and electrochemical impedance spectroscopy (EIS) techniques. The hierarchical Co3 O4 @CNC nanohybrid electrode showed the highest specific capacitance of 396 F/g that of pristine Co3 O4 nanostructure electrode (was 268 F/g) at a current density of 1.0 A/g for a three‐electrode assembly. The hierarchical Co3 O4 @CNC nanohybrid electrode showed appreciable capacitive behavior with 96% cyclic retention even after 5, 000 cycles at 1.0 A/g with energy density of 12.5 Wh k −1 at a power density of 230.5 W k −1 . Thus, it is suitable for improving and/or designing active electrocatalysts for enhanced supercapacitor applications. Abstract : Nanocellulose based composite materials has attracted much attention in the fabrication of supercapacitor electrodes. Green ball‐milling technique was set forth for the fabrication of hierarchical Co3 O4 nano‐hybrid structures in connotation with cellulose nanocrystals (CNCs). The nano‐hybrid hierarchical electrode (Co3 O4 @CNC) showed excellent specific capacitance of 396 F/g than its pristine Co3 O4 nanostructure electrode (268 F/g) at a current density of 1.0 A/g for three‐electrode cell assembly.