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2019-02-04

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cc-by (c) Amade Rovira, Roger et al., 2019
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/158581

Super-Capacitive Performance of Manganese Dioxide/Graphene Nano-Walls Electrodes Deposited on Stainless Steel Current Collectors

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https://doi.org/10.3390/ma12030483

Resum

Graphene nano-walls (GNWs) are promising materials that can be used as an electrode in electrochemical devices. We have grown GNWs by inductively-coupled plasma-enhanced chemical vapor deposition on stainless steel (AISI304) substrate. In order to enhance the super-capacitive properties of the electrodes, we have deposited a thin layer of MnO2 by electrodeposition method. We studied the effect of annealing temperature on the electrochemical properties of the samples between 70 °C and 600 °C. Best performance for supercapacitor applications was obtained after annealing at 70 °C with a specific capacitance of 104 F·g−1 at 150 mV·s−1 and a cycling stability of more than 14k cycles with excellent coulombic efficiency and 73% capacitance retention. Electrochemical impedance spectroscopy, cyclic voltammetry, and galvanostatic charge/discharge measurements reveal fast proton diffusion (1.3 × 10−13 cm2·s−1) and surface redox reaction after annealing at 70 °C.

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Grafè, Aparells electrònics, Acer inoxidable

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Graphene, Electronic apparatus and appliances, Stainless steel

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Citació

AMADE ROVIRA, Roger, MUYSHEGYAN-AVETISYAN, Arevik, MARTÍ GONZÁLEZ, Joan, PÉREZ DEL PINO, Ángel, GYÖRGY, Eniko, PASCUAL MIRALLES, Esther, ANDÚJAR BELLA, José luis, BERTRÁN SERRA, Enric. Super-Capacitive Performance of Manganese Dioxide/Graphene Nano-Walls Electrodes Deposited on Stainless Steel Current Collectors. _Materials_. 2019. Vol. 12, núm. 3, pàgs. 483. [consulta: 24 de gener de 2026]. ISSN: 1996-1944. [Disponible a: https://hdl.handle.net/2445/158581]

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