Ultrathin Ni-Mo oxide nanoflakes for high-performance supercapacitor electrodes

Chavan, Harish S., Hou, Bo ORCID: https://orcid.org/0000-0001-9918-8223, Ahmed, Abu Talha Aqueel, Kim, Jongmin, Jo, Yongcheol, Cho, Sangeun, Park, Youngsin, Pawar, Sambhaji M., Inamdar, Akbar I., Cha, Seung Nam, Kim, Hyungsang and Im, Hyunsik 2018. Ultrathin Ni-Mo oxide nanoflakes for high-performance supercapacitor electrodes. Journal of Alloys and Compounds 767 , pp. 782-788. 10.1016/j.jallcom.2018.07.179

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Abstract

Supercapacitors based on nanomaterial electrodes exhibit great potential as power sources for advanced electronic devices. From a practical viewpoint, it is desirable to fabricate highly active and sustainable nanomaterial electrodes consisting of non-precious elements using a simple technique in a controllable way. In this work, we report the synthesis of a self-assembled ultra-thin porous nanoflake Ni-Mo oxide (NMO) film using the successive ionic layer adsorption and reaction (SILAR) technique. The nanoflake NMO thin film electrode with a large electrochemically active surface area of ∼108 cm−2 exhibits a high specific capacitance of 1180 Fg−1 at a current density of 1 Ag−1 and excellent rate capability, with a negligible capacity loss of 0.075% per cycle. Even at a high current rate of 10 A g−1 it retains a capacity of 600 Fg−1. The highest energy and power densities obtained are 119 Whkg−1 and 15.7 kWkg−1, respectively. Electrochemical impedance spectroscopy analyses reveal that the electrode has considerably low charge transfer resistance. The observed excellent electrochemical energy storage performance of the nanoflake NMO electrode with a nanoporous surface is due to the synergetic effects of the large electrochemically active surface area, enhanced ion diffusion, and improved electrical conductivity.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Elsevier
ISSN:	0925-8388
Date of First Compliant Deposit:	25 February 2020
Date of Acceptance:	15 July 2018
Last Modified:	04 Dec 2024 19:15
URI:	https://orca.cardiff.ac.uk/id/eprint/129550

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