Journal
MATERIALS & DESIGN
Volume 122, Issue -, Pages 376-384Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2017.03.024
Keywords
Nanocomposites; Hybrid metal oxides; Energy storage devices; Renewable energy; Electrochemical charge storage
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Funding
- Research & Innovation Department of Universiti Malaysia Pahang [RDU1503100, GRS150328]
- National Research Foundation, Prime Minister's Office, Singapore under its Competitive Research Programme (CRP) [NRF-CRP 10-2012-6]
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This paper reports the synthesis of continuous nanobelts, whose thickness is less than half of its pore diameter, of a material hybrid composing of nanograins of nickel oxide and cobalt oxide by electrospinning technique and their capacitive charge storage properties. While the constituent binary metal oxides (NiO and CO3O4) formed solid cylindrical nanofibers the hybrid and a stoichiometric compound in the Ni-Co-O system, i.e., spinel-type NiCo2O4, formed as thin nanobelts due to the magnetic interaction between nickel and cobalt ions. The nanobelts showed six-fold larger surface area, wider pores, and impressive charge storage capabilities compared to the cylindrical fibres. The hybrid nanobelts showed high specific capacitance (Cs similar to 1250 F g(-1) at 10 A g(-1) in 6 M KOH) with high capacity retention, which is appreciably larger than found for the stoichiometric compound (similar to 970 F g(-1) at 10 A g(-1)). It is shown that the hybrid nanobelts have lower internal resistance (1.3 Omega), higher diffusion coefficient (4.6 x 10(-13) cm(2) s(-1)) and smaller relaxation time (0.03 s) than the benchmark materials studied here. (C) 2017 Elsevier Ltd. All rights reserved.
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