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Title: Super-Capacitive Performance of Manganese Dioxide/Graphene Nano-Walls Electrodes Deposited on Stainless Steel Current Collectors
Author: 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
Keywords: Grafè
Aparells electrònics
Acer inoxidable
Electronic apparatus and appliances
Stainless steel
Issue Date: 4-Feb-2019
Publisher: MDPI
Abstract: 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.
Note: Reproducció del document publicat a:
It is part of: Materials, 2019, vol. 12, num. 3, p. 483
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ISSN: 1996-1944
Appears in Collections:Articles publicats en revistes (Física Aplicada)

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