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Pseudocapacitance Properties of Co3O4 Nanoparticles Synthesized Using a Modified Sol-Gel Method

2018; Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímer; Volume: 21; Issue: 2 Linguagem: Inglês

10.1590/1980-5373-mr-2017-0521

ISSN

1980-5373

Autores

Michele K. Lima-Tenório, Carlos Sérgio Ferreira, Querem Hapuque Félix Rebelo, R.F.B. De Souza, Raimundo Ribeiro Passos, Edgardo Alfonso Gómes Pineda, Leandro Aparecido Pocrifka,

Tópico(s)

Transition Metal Oxide Nanomaterials

Resumo

This work reports the synthesization of nanoparticles cobalt oxide (Co3O4) with no secondary phase by a modified sol-gel method and its structural morphological and electrochemical characterizations. FTIR, XRD and Raman analysis showed the formation of spinel cobalt oxide with no secondary phase. TEM images revealed that an undefined morphology with average crystallite size estimated by Scherrer's equation was found to be 30 nm. Experiments of cyclic voltametric, galvanostatic charge-discharge and impedance spectroscopy were evaluated at 1 mol L-1 KOH and revealed an intrinsic pseudocapacitance. The studies of complex capacitance and complex power revealed the resistive and capacitive characteristics with a specific capacitance of 120 F g-1.

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