Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

A biopolymer gel-decorated cobalt molybdate nanowafer: Effective graft polymer cross-linked with an organic acid for better energy storage

Ramkumar, R. and Minakshi, M.ORCID: 0000-0001-6558-8317 (2016) A biopolymer gel-decorated cobalt molybdate nanowafer: Effective graft polymer cross-linked with an organic acid for better energy storage. New Journal of Chemistry, 40 (3). pp. 2863-2877.

Link to Published Version: http://dx.doi.org/10.1039/c5nj02799c
*Subscription may be required

Abstract

Nanoflake-like α-CoMoO4 was prepared with the aid of a cationic surfactant, cetyltrimethylammonium bromide (CTAB), as an electrode material for supercapacitors by scalable solution combustion synthesis (SCS). The specific capacitance of the fabricated hybrid device (CoMoO4/CTAB vs. activated carbon (AC)) was 39 F g-1, a marginal increase compared to that of the as-prepared (parent) CoMoO4 (24 F g-1). To achieve better energy storage, modification was carried out on CoMoO4 by grafting chitosan onto it in the presence of a weak acetic acid (AA) or citric acid (CA) crosslinking agent. The biopolymer chitosan is cross-linked when using CA as a cross-linker, while in the case of acetic acid, grafting of chitosan/AA does not occur. The improved properties of CTAB- and polymer-modified CoMoO4 were evaluated using physical and electrochemical methods and compared with the as-prepared (parent) compound. The polymer-modified composite exhibited a maximum specific capacitance of 71 F g-1 at 2 mA cm-2 with a capacity retention of 81% after 2000 cycles, about twofold higher than that of the CTAB-modified electrode. The influence of surfactant and chitosan concentrations on the specific capacitance is also established. A solid state capacitor was fabricated using CoMoO4vs. AC, with chitosan as the gel separator. High resolution transmission electron microscopy (HR-TEM) and field emission scanning electron microscopy (FE-SEM) images support the cross-linking strategy and nanowafer-like morphology with a honeycomb arrangement.

Item Type: Journal Article
Murdoch Affiliation: School of Engineering and Information Technology
Publisher: Royal Society of Chemistry
Copyright: © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2016.
URI: http://researchrepository.murdoch.edu.au/id/eprint/30424
Item Control Page Item Control Page