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Title: Electric-field oriented self-assembly of Mn₃O₄ nanostructures driven by liquid plasma discharge for super capacitor
Authors: Xiu, Mingzhen
Cao, Xun
Lu, Yu
Huang, Kang
Li, Chaojiang
Zhang, Bowei
Wu, Junsheng
Huang, Yizhong
Keywords: Engineering::Materials
Issue Date: 2023
Source: Xiu, M., Cao, X., Lu, Y., Huang, K., Li, C., Zhang, B., Wu, J. & Huang, Y. (2023). Electric-field oriented self-assembly of Mn₃O₄ nanostructures driven by liquid plasma discharge for super capacitor. Electrochimica Acta, 439, 141620-.
Journal: Electrochimica Acta
Abstract: Fabrication of low-cost, uniform size, and binder-free nanomaterials via contact glow discharge electrolysis (CGDE) for high performance supercapacitors is still a great challenge. In this work, by utilizing the CGDE method as a template, the rapid synthesis of two different morphologies of Mn3O4 nanostructures through a one-step liquid plasma discharge deposition (LPDD) method is proposed and demonstrated. The two uniform nano-octahedron and nano-sheet Mn3O4 structures are grown upon the different electric field orientations under a low DC voltage. The transportation of ions is dependent on the electrical field direction leading to the formation of different nanostructures. Upon the horizontal electric field to the grown substrate, the Ostwald ripening effect is dominant in the growth process of single-crystalline Mn3O4 nano-octahedra, which exhibits high crystallinity and geometric symmetry with a side length of 40 nm. In contrast, the hydrothermal effect assists in the formation of Mn3O4 nano-sheet when the electrical field is perpendicular to the substrate. The continuous transportation of ions promotes the fast growth of ultra-thin and porous Mn3O4 polycrystalline nano-sheets. The binder-free nano-sheet Mn3O4/carbon composite electrode delivers a higher specific capacitive (488 F g−1) and remarkable cycle life (10,000 cycles; 99.1% capacity retention). This work addresses a facial, cost-effective, and scalable path of the production of nanostructures with different morphologies simply by the operation of an electric field.
ISSN: 0013-4686
DOI: 10.1016/j.electacta.2022.141620
Schools: School of Materials Science and Engineering 
Interdisciplinary Graduate School (IGS) 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2022 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:ERI@N Journal Articles
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