Green synthesis of ZnO nanostructured electrode for supercapacitor
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2017
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BRAZIL MRS MEETING, 16th
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Resumo
The electrical double layer capacitor (EDLC), has been extensively investigated
for its many applications in electric and electronic devices, due to high power
density and long-life cycle. Zinc oxide (ZnO) is a promising candidate for the
electrochemical supercapacitor electrode. ZnO is well known to be an active
battery electrode material with a high energy density of about 650 Ag-1 [1], but it
has the disadvantage of dendrites formation during consecutive cycling, which
decreases life cycle. In this paper, we report a relatively straightforward,
environmental friendly and low-cost method for preparing ZnO electrodes that
consists in two steps. Starting with a ZnO seed layer onto a steel substrate
employing the successive ionic layer adsorption and reaction (SILAR) method [2].
Subsequently, a chemical deposition bath was used for the nanostructured ZnO
growth. A low temperature SILAR method was used in this study, replacing high
temperature and vacuum methods, such as chemical vapor deposition or
sputtering, to create an interface region between the conductive steel current
collector and the nanostructured ZnO electrode. Scanning electronic microscopy
has been employed in the characterization of the two-step produced
nanostructured ZnO electrodes. The electrochemical performance of the
nanocomposite electrodes has been investigated using cyclic voltammetry (10 to
50) mVs-1 and charge-discharge curves (1 to 20) mAcm-2 in aqueous KOH
electrolyte at several concentrations. Cyclic voltammetry exhibited a broad redox
peak indicative of typical reversible redox reaction of ZnO with the K+,
responsible for the faradaic reactions in the supercapacitor. The enhanced
electrochemical performance has been attributed to the synergistic effects of
pseudo-capacitance behavior of the ZnO phase grown on the ZnO seeds and to the
nanostructured features of the electrode.
Como referenciar
GALEGO, EGUIBERTO; SERNA, MARILENE M.; TATEI, TATIANE Y.; LIMA, BRUNA R.; FARIA, RUBENS N. Green synthesis of ZnO nanostructured electrode for supercapacitor. In: BRAZIL MRS MEETING, 16th, September 10-14, 2017, Gramado, RS. Abstract... São Carlos, SP: Aptor Software, 2017. p. 1348-1349. Disponível em: http://repositorio.ipen.br/handle/123456789/31199. Acesso em: 19 Mar 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.