ZnO/Carbon nanowalls shell/core nanostructures as electrodes for supercapacitors

Abdelouadoud Guerra (1) , Amine Achour (2) , Sorin Vizireanu (3) , Gheorghe Dinescu (3) , Samira Messaci , Toufik Hadjersi (1) , Rabah Boukherroub (4, 5) , Yannick Coffinier (4, 5) , Jean-Jacques Pireaux (6)

1 Alger-7 merveilles
2 NISM - Namur Institute of Structured Matter
3 INFLPR - National Institute for Laser, Plasma and Radiation Physics
4 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
5 NBI - IEMN - NanoBioInterfaces - IEMN
6 PMR - Centre de Recherche en Physique de la Matière et du Rayonnement [Namur]

In this work, carbon nanowalls (CNW) were coated with zinc oxide (ZnO) for use as supercapacitor electrodes. The ZnO layers of different thicknesses were deposited using pulsed laser ablation in oxygen reactive atmosphere. The performance of the CNW-ZnO electrodes was found to be dependent on the thickness of ZnO deposit, which in turn influences the specific capacitance and capacitance retention of the CNW-ZnO electrodes. The areal capacitance of the CNW-ZnO measured in mild electrolyte of 1 M KCl was as high as 4.3 mF•cm −2 at a current density of 0.2 mA•cm −2 and 1.41 mF•cm −2 at a scan rate of 10 mV•s −1 with an enhanced capacitance stability over 26,000 cycles. Such results demonstrate the potential use of ZnO nanostructures for low cost and high performance material for electrochemical capacitors.

Mots clés: Carbon nanowalls; Electrochemical capacitors; PLD deposition; ZnO

Domaines: Chimie analytique; Matériaux; Biochimie, Biologie Moléculaire; Neurosciences [q-bio.NC]; Chimie; Physique [physics]; Micro et nanotechnologies/Microélectronique

Abdelouadoud Guerra, Amine Achour, Sorin Vizireanu, Gheorghe Dinescu, Samira Messaci, et al.. ZnO/Carbon nanowalls shell/core nanostructures as electrodes for supercapacitors. Applied Surface Science, 2019, 481, pp.926-932. ⟨10.1016/j.apsusc.2019.03.204⟩. ⟨hal-03335610⟩