Microstructural and electrochemical studies of HDDR-graphene supercapacitors electrodes in KOH electrolyte
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2018
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CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23.
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In the past, the hydrogenation disproportionation desorption and recombination
(HDDR) process has only been used to produced rare earth transition metal polymer
bonded permanent magnets with outstanding performance. Recently, however, it has
been shown that the HDDR process (850oC) can be successfully employed to produce
reduced graphene oxide for electrochemical supercapacitors. In the present work, the
electrochemical characteristics of HDDR-graphene supercapacitors have been
compared to those obtained with chemically reduced commercial graphene oxide.
Lower HDDR processing temperatures (200-600oC) have been used in this study for
a comparison with previous investigations. The equivalent series and parallel
resistances (EPR and ESR) and specific capacitance (Cs) of HDDR-graphene
supercapacitors electrodes have been investigated using cyclic voltammetry. Room
temperature specific capacitances calculated from cyclic voltammetry curves at scan
rates of 2 mVs-1 reached ~160 Fg-1 in 1 molL-1 KOH electrolyte. Internal series
resistances of the HDDR-graphene electrodes were measured using the galvanostatic
curves also at room temperature. The microstructures of the electrode material have
been investigated using scanning electron microscopy (SEM) and chemical
microanalyses employing energy dispersive X-ray analysis (EDX).
Como referenciar
GALDINO, G.S.; SILVA, D.V.; CRUZ, P.D.; CASINI, J.S.; SAKATA, S.K.; FARIA, R.N. Microstructural and electrochemical studies of HDDR-graphene supercapacitors electrodes in KOH electrolyte. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... p. 2923-2923. Disponível em: http://repositorio.ipen.br/handle/123456789/29628. Acesso em: 30 Dec 2025.
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