Electron beam irradiation of reduced graphene oxide-palladium nanocomposite for electrochemical supercapacitor
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2017
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PAN AMERICAN CONGRESS OF NANOTECHNOLOGY, 1st
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Abstract
Recent work has shown that palladium nanoparticle–graphene composite can be an
efficient electrode material in energy storage applications in supercapacitors. These Pd-based
supercapacitors showed remarkable properties with a maximum specific capacitance of 637 F
g -1 and also exhibited excellent cycle life with 91.4% of the initial specific capacitance retained
after 10000 cycles. Palladium nanoparticle decorated graphene composite was synthesized via
a chemical approach in a single step by the simultaneous reduction of graphene oxide and
palladium chloride from the aqueous phase using ascorbic acid as reducing agent. In the
present work, electron beam irradiation has been investigated as an attempt to produce
graphene-palladium nanocomposites. Graphite oxide was prepared using a modified Hummers’
method and dispersed in ethanol, exfoliated using ultrasonication to produce Graphene Oxide
(GO) and dried for further analysis and processing. This material was thermic reduced in high
vacuum (10 -6 mbar) at various temperatures (200-600 o C) and mixed in a solution with palladium.
The samples were placed in a 50 ml beaker with Pd(NO 2 ) 2 2H 2 O and were irradiated with
300kGy , dose rate 1,6 kGy s -1 . Irradiation was carried out in an electron accelerator Dynamitron
de 37,5 kW (E = 1,5 MeV, 25 mA) (Radiation Dynamics Inc.), The resulting irradiated material
was characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy
(FTIR). These investigations showed that a palladium graphene mixture for supercapacitors
applications is formed by electron beam irradiation.
Citation
GALDINO, GABRIEL S.; FERREIRA SOBRINHO, LUIZA; CRUZ, PEDRO V.D.; CASINI, JULIO C.S.; SAKATA, SOLANGE K.; FARIA JUNIOR, RUBENS N. Electron beam irradiation of reduced graphene oxide-palladium nanocomposite for electrochemical supercapacitor. In: PAN AMERICAN CONGRESS OF NANOTECHNOLOGY, 1st, 27-30 de novembro, 2017, Guarujá, SP. Abstract... DisponĂvel em: http://repositorio.ipen.br/handle/123456789/29039. Acesso em: 17 Mar 2025.
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