https://scholars.lib.ntu.edu.tw/handle/123456789/625457
標題: | Thickness-controlled porous hexagonal NiO nanodiscs electrodes for use in supercapacitors: How nanodiscs thickness influences electrochemical performance | 作者: | Chavhan M.P Slovak V CHUNG-HSIN LU |
關鍵字: | Calcination; Hydrothermal synthesis; Supercapacitor; Two-dimensional NiO nanodiscs | 公開日期: | 2022 | 卷: | 50 | 來源出版物: | Journal of Energy Storage | 摘要: | Two-dimensional (2D) nickel oxide (NiO) hexagonal nanodiscs were synthesized via a hydrothermal route, followed by successive calcination. The decisive roles of the [OH−]/[Ni2+] molar ratios, as well as the calcination temperatures, were found in controlling the nanodiscs morphology of the NiO nanostructures. The increase in the concentration of OH− ions in the precursor solution influenced the crystal growth that directed to the formation of the hexagonal nanodisc morphology with increased edge thickness and beyond certain limits transformation from the nanodiscs to complete 3D morphology. The nanodiscs grew with increasing exposed surface size with a high BET area and varied thicknesses from 4 to 20 nm. The increase in calcination temperature improved crystallinity by eliminating crystal defects and voids, while crystals grew along the (200) plane. However, a reduction in the BET area and pore volume occurred at higher calcination temperature because of the collapse in micro-mesopores. The electrochemical performances of NiO electrodes show dependence on the thickness of the nanodiscs, the calcination temperature, and the type of current collector used. A distinct electrochemical feature was observed for NiO nanodiscs over planar conductive carbon fiber paper and 3D porous Ni foam substrates. The hydrothermal approach reported here to produce thickness-controlled NiO nanodiscs with high intrinsic surface area has great potential for developing next-generation battery-type faradic electrodes in conjunction with carbon allotropes and other metal oxide materials for high power and energy density throughput. © 2022 The Authors |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85125653972&doi=10.1016%2fj.est.2022.104329&partnerID=40&md5=ec033b474848b3ef7c0a8ee68a35f060 https://scholars.lib.ntu.edu.tw/handle/123456789/625457 |
ISSN: | 2352152X | DOI: | 10.1016/j.est.2022.104329 | SDG/關鍵字: | Calcination; Carbon fibers; Copper oxides; Crystallinity; Electrochemical electrodes; Hydrothermal synthesis; Metals; Molar ratio; Morphology; Supercapacitor; Calcination temperature; Electrochemical performance; Hydrothermal routes; Molar ratio; Nanodisks; OH ions; Oxide nanostructures; Synthesised; Two-dimensional; Two-dimensional nickel oxide nanodisk; Nickel oxide |
顯示於: | 化學工程學系 |
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