Synergistic enhancement of binder-free MnO 2 electrodes through morphological control and graphene oxide integration for high performance supercapacitors
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Le résumé fourni par la source
This research focuses on synthesizing MnO 2 via a one-step hydrothermal method and evaluating its electrochemical performance for supercapacitor applications. MnO 2 was directly coated on a Ni foam substrate to create binder-free electrodes. Varying hydrothermal conditions altered the morphology and crystallinity of MnO 2 , with semi-crystalline structures formed at intermediate temperatures and times-exhibiting enhanced charge storage due to higher surface area and active sites. SEM analysis revealed diverse morphologies, including particulate, spherical and rod-like structures. Among the samples, M2 (synthesized at [Formula: see text]C for 8[Formula: see text]h) showed the best performance, achieving a specific capacitance (C sp ) of 780[Formula: see text]Fg[Formula: see text] with energy and power densities of 39.99[Formula: see text]Whkg[Formula: see text] and 0.29[Formula: see text]kWkg[Formula: see text], respectively. To further improve performance, M2 was combined with varying concentrations of graphene oxide (GO). The M2-5GO composite electrode delivered a high C sp of 1145[Formula: see text]Fg[Formula: see text], an energy density of 58.06[Formula: see text]Whkg[Formula: see text] and maintained 94.6% capacitance over 5000 cycles. The enhanced performance was attributed to the synergistic effect offered by a higher surface area of MnO 2 and the layered structure of GO. Analysis indicated that while M2 relied mainly on diffusive charge storage, while GO addition increased capacitive contribution by 11%. The study demonstrates MnO 2 has a potential for high-performance supercapacitors, especially when used with GO. Furthermore, M2-5GO was used to develop a symmetric two-electrode device. Electrochemical characterization of the device revealed that it possessed C sp of 333[Formula: see text]Fg[Formula: see text] at 1[Formula: see text]mVs[Formula: see text] with energy and power density of 44.42[Formula: see text]Whkg[Formula: see text] and 0.50[Formula: see text]kWkg[Formula: see text], respectively, at 1[Formula: see text]Ag[Formula: see text] current density.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé, mais le titre doit être comparé manuellement.
- Titre Crossref
- Synergistic enhancement of binder-free MnO <sub>2</sub> electrodes through morphological control and graphene oxide integration for high performance supercapacitors
- Date Crossref
- 30/12/2025
- Éditeur
- World Scientific Pub Co Pte Ltd
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Gdańsk University of Technology pays non établi dans la noticeUniversité ou école supérieure
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University of the Punjab Centre of Excellence in Solid State Physics pays non établi dans la noticeUniversité ou école supérieure
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University of Gdańsk pays non établi dans la noticeUniversité ou école supérieure
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Växjö Kommun pays non établi dans la noticeOrganisme public
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Sejong University Department of Nanotechnology and Advanced Materials Engineering pays non établi dans la noticeUniversité ou école supérieure
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Faculty of Electronics Telecommunication & Informatics Department of Functional Materials Engineering pays non établi dans la noticeUniversité ou école supérieure
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Faculty of Chemical & Materials Engineering Institute of Metallurgy & Materials Engineering pays non établi dans la noticeUniversité ou école supérieure
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Faculty of Technology Department of Built Environment & Energy Technology pays non établi dans la noticeUniversité ou école supérieure
Gdańsk University of Technology, Centre of Excellence in Solid State Physics — University of the Punjab et University of Gdańsk, avec 5 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.