Protonated nickel 2-methylimidazole framework as an advanced electrode material for high-performance hybrid supercapacitor
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10.1016/j.mtener.2021.100736
Inclou dades d'ús des de 2022
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hdl:2117/359833
Tipus de documentArticle
Data publicació2021-09-01
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Reconeixement-NoComercial-SenseObraDerivada 4.0 Internacional
Abstract
Metal-organic frameworks (MOFs) with high conductivity have proven to be an exciting electrode material for energy storage devices. However, most of the MOFs exhibit a low electrical conductivity, which limits their use in supercapacitors. To overcome this issue herein, a simple acid treatment method was adopted to obtain nanoflower-like nickel 2-methylimidazole framework (Ni-MOF) to improve the electrical conductivity without disrupting its framework. The sample treated with a solution of sulfuric acid (H2SO4) at optimal pH 2 (Ni-MOF-2), exhibited improved surface texture with excellent electrochemical characteristics. The Ni-MOF-2 sample displayed a high specific capacity (Cs) of 467 C/g at 1 A/g in aqueous 6 M potassium hydroxide (KOH) electrolyte than that of other samples. This is mainly due to enhanced proton conduction in Ni-MOF-2 after acid treatment. In addition, a hybrid supercapacitor (HSC) device was fabricated using battery-type Ni-MOF-2 as a positive electrode and heteroatomenriched activated carbon (O, N, S@AC) as a negative electrode. The fabricated HSC exhibited a maximum specific capacity (Cs) of 38 mAh/g with high specific energy (Es) 39 Wh/kg and maximum specific power (Ps) of 11,079 W/kg. Moreover, the HSC displayed excellent cyclic stability of ~87% for 10,000 continuous galvanostatic charge/discharge (GCD) cycles.
Descripció
© 2021 Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
CitacióKale, A. [et al.]. Protonated nickel 2-methylimidazole framework as an advanced electrode material for high-performance hybrid supercapacitor. "Materials Today Energy", 1 Setembre 2021, vol. 21, núm. article 100736.
ISSN2468-6069
Versió de l'editorhttps://www.sciencedirect.com/science/article/abs/pii/S2468606921001015
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