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Environment-modulated crystallization of Cu2O and CuO nanowires by electrospinning and their charge storage properties

Harilal, Midhun and Krishnan, Syam G. and Pal, Bhupender and Reddy, M. Venkatashamy and Mohd Hasbi, Ab. Rahim and M. M., Yusoff and Rajan, Jose (2018) Environment-modulated crystallization of Cu2O and CuO nanowires by electrospinning and their charge storage properties. Langmuir, 34 (5). pp. 1873-1882. ISSN 0743-7463

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Abstract

This article reports the synthesis of cuprous oxide (Cu2O) and cupric oxide (CuO) nanowires by controlling the calcination environment of electrospun polymeric nanowires and their charge storage properties. The Cu2O nanowires showed higher surface area (86 m2 g−1) and pore size than the CuO nanowires (36 m2 g−1). Electrochemical analysis was carried out in 6 M KOH, and both the electrodes showed battery-type charge storage mechanism. The electrospun Cu2O electrodes delivered high discharge capacity (126 mA h g −1) than CuO (72 mA h g −1) at a current density of 2.4 mA cm −2. Electrochemical impedance spectroscopy measurements show almost similar charge-transfer resistance in Cu2O (1.2 Ω) and CuO (1.6 Ω); however, Cu2O showed an order of magnitude higher ion diffusion. The difference in charge storage between these electrodes is attributed to the difference in surface properties and charge kinetics at the electrode. The electrode also shows superior cyclic stability (98%) and Coulombic efficiency (98%) after 5000 cycles. Therefore, these materials could be acceptable choices as a battery-type or pseudocapacitive electrode in asymmetric supercapacitors.

Item Type: Article
Uncontrolled Keywords: Cuprous oxide; Cupric oxide; Energy storage
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General)
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Prof. Dr. Jose Rajan
Date Deposited: 04 Mar 2019 02:11
Last Modified: 04 Mar 2019 02:11
URI: http://umpir.ump.edu.my/id/eprint/23745
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