Electrochemical characteristics and microstructures of activated carbon powder supercapacitors for energy storage
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2018
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Materials Science Forum
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In recent years, extensive investigations have focused on the study and improvement of
supercapacitor electrode materials. The electric devices produced with these materials are used to
store energy over time periods ranging from seconds to several days. The main factor that
determines the energy storage period of a supercapacitor is its self-discharge rate, i.e., the gradual
decrease in electric potential that occurs when the supercapacitor terminals are not connected to
either a charging circuit or electric load. Self-discharge is attenuated at lower temperatures,
resulting in an increased energy storage period. This paper addresses the temperature-dependence of
self-discharge via a systematic study of supercapacitors with nominal capacitances of 1.0 and 10.0 F
at DC potentials of 5.5 and 2.7 V, respectively. The specific capacitances, internal resistances, and
self-discharge characteristics of commercial activated carbon electrode supercapacitors were
investigated. Using cyclic voltammetry, the specific capacitances were determined to be 44.4 and
66.7 Fg−1 for distinct carbon electrode supercapacitors. The self-discharge characteristics were
investigated at both room temperature and close to the freezing point. The internal resistances of the
supercapacitors were calculated using the discharge curves at room temperature. The
microstructures of the electrode materials were determined using scanning electron microscopy.
Como referenciar
GONSALVES, TAYARA C.; SILVA, FRANKS M.; VIEIRA, LIGIA S.; CASINI, JULIO C.S.; FARIA, RUBENS N. de. Electrochemical characteristics and microstructures of activated carbon powder supercapacitors for energy storage. Materials Science Forum, v. 930, p. 597-602, 2018. DOI: 10.4028/www.scientific.net/MSF.930.597. Disponível em: http://repositorio.ipen.br/handle/123456789/29309. Acesso em: 16 Apr 2024.
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