Solubility-dependent NiMoO4 nanoarchitectures: direct correlation between rationally designed structure and electrochemical pseudokinetics

Hong, John, Lee, Young-Woo, Hou, Bo ORCID: https://orcid.org/0000-0001-9918-8223, Ko, Wonbae, Lee, Juwon, Pak, Sangyeon, Hong, JinPyo, Morris, Stephen M., Cha, SeungNam, Sohn, Jung Inn and Kim, Jong Min 2016. Solubility-dependent NiMoO4 nanoarchitectures: direct correlation between rationally designed structure and electrochemical pseudokinetics. ACS Applied Materials and Interfaces 8 (51) , pp. 35227-35234. 10.1021/acsami.6b11584

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Abstract

Tailoring the binary metal oxide along with developing new synthetic methods for controlling resultant nanostructures in a predictive way is an essential requirement for achieving the further improved electrochemical performance of pseudocapacitors. Here, through a rational design of the supersaturation-mediated driving force for hydrothermal nucleation and crystal growth, we successfully obtain one-dimensional (1-D) nickel molybdenum oxide (NiMoO4) nanostructures with controlled aspect ratios. The morphology of the 1-D NiMoO4 nanostructures can be tuned from a low to a high aspect ratio (over a range of diameter sizes from 80 to 800 nm). Such a controllable structure provides a platform for understanding the electrochemical relationships in terms of fast relaxation times and improved ion-diffusion coefficients. We show that the 1-D NiMoO4 electrode with a high aspect ratio (HAR) exhibits a much higher specific capacitance of 1335 F g–1 at a current density of 1 A g–1 compared to the other electrodes with a relatively low aspect ratio, which is due to the unique physical and chemical structure being suitable for electrochemical kinetics. We further demonstrate that an asymmetric supercapacitor consisting of the tailored HAR-NiMoO4 electrode can achieve an energy density of 40.7 Wh kg–1 and a power density of 16 kW kg–1.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Chemical Society
ISSN:	1944-8244
Date of First Compliant Deposit:	31 March 2020
Date of Acceptance:	7 December 2016
Last Modified:	24 Nov 2024 18:06
URI:	https://orca.cardiff.ac.uk/id/eprint/129518

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