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

Chavan, Harish S., Hou, Bo, 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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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: 10 Mar 2020 18:05

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