Battery-like behavior of Ni-ceria based systems: Synthesis, surface defects and electrochemical assessment

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dc.contributor.authorPaskocimas, Carlos Alberto
dc.contributor.authorAraújo, Allan Jedson Menezes de
dc.contributor.authorSilva, Vinícius Dias
dc.contributor.authorSousa, Angel Roberta Oliveira de
dc.contributor.authorGrilo, João Paulo de Freitas
dc.contributor.authorSimões, Thiago Araújo
dc.contributor.authorMacedo, Daniel Araújo de
dc.contributor.authorNascimento, Rubens Maribondo do
dc.date.accessioned2021-04-12T19:18:40Z
dc.date.issued2019-04-15
dc.description.embargo2021-05
dc.description.resumoNiO, CeO2 and respective composites are extensively used in energy storage devices due to mostly their high electrochemical activity. However, the assessment of battery-like behavior of Ni-ceria based systems comprising (Ni or Gd)-doped ceria combined with NiO seems to be neglected in the literature. In this work, NiO and ceria-based solid solutions composite powders were obtained by a co-precipitation synthesis method. The structure and particle size of the calcined powders were investigated by X-ray diffractometry (XRD) and field emission scanning electron microscopy (FESEM), respectively. Oxidative states of composites were inspected by X-ray photoelectron spectroscopy (XPS). The electrochemical performance of powders was evaluated by cyclic voltammetry, galvanostatic charge-discharge and impedance spectroscopy. Refinement of the XRD patterns showed that powders have nanosized crystallites and mean size of particles within 20 – 70 nm were revealed by FESEM. The improved specific capacity of the NiO-CeO2 electrode material (about 2.5 times higher than that of NiO-CGO at 5 mV s−1) is due to an increase in Faradic reactions taken place on its surface with a higher fraction of defects (namely Ni3+, Ce3+ and oxygen vacancies), as determined by XPS. The superior electrochemical performance of the NiO-CeO2 electrode is also confirmed by electrochemical impedance spectroscopypt_BR
dc.identifier.citationARAðJO, Allan J.M.; SILVA, Vinícius D.; SOUSA, Angel R.O.; GRILO, João P.F.; SIMÕES, Thiago A.; MACEDO, Daniel A.; NASCIMENTO, Rubens M.; PASKOCIMAS, Carlos A.. Battery-like behavior of Ni-ceria based systems: synthesis, surface defects and electrochemical assessment. Ceramics International, [S.L.], v. 45, n. 6, p. 7157-7165, abr. 2019. Disponível em: https://www.sciencedirect.com/science/article/pii/S0272884218336174?via%3Dihub. Acesso em: 11 dez. 2020. http://dx.doi.org/10.1016/j.ceramint.2018.12.222.pt_BR
dc.identifier.doi10.1016/j.ceramint.2018.12.222
dc.identifier.issn0272-8842
dc.identifier.urihttps://repositorio.ufrn.br/handle/123456789/32165
dc.languageenpt_BR
dc.publisherElsevierpt_BR
dc.subjectPowder synthesispt_BR
dc.subjectNiOCeO2pt_BR
dc.subjectDoped ceriapt_BR
dc.subjectBattery-like electrodespt_BR
dc.titleBattery-like behavior of Ni-ceria based systems: Synthesis, surface defects and electrochemical assessmentpt_BR
dc.typearticlept_BR

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