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

NiO, 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...

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Principais autores: Paskocimas, Carlos Alberto, Araújo, Allan Jedson Menezes de, Silva, Vinícius Dias, Sousa, Angel Roberta Oliveira de, Grilo, João Paulo de Freitas, Simões, Thiago Araújo, Macedo, Daniel Araújo de, Nascimento, Rubens Maribondo do
Formato: article
Idioma:English
Publicado em: Elsevier
Assuntos:
Powder synthesis
NiOCeO2
Doped ceria
Battery-like electrodes
Endereço do item:https://repositorio.ufrn.br/handle/123456789/32165
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spelling ri-123456789-321652024-03-19T04:02:14Z Battery-like behavior of Ni-ceria based systems: Synthesis, surface defects and electrochemical assessment Paskocimas, Carlos Alberto Araújo, Allan Jedson Menezes de Silva, Vinícius Dias Sousa, Angel Roberta Oliveira de Grilo, João Paulo de Freitas Simões, Thiago Araújo Macedo, Daniel Araújo de Nascimento, Rubens Maribondo do Powder synthesis NiOCeO2 Doped ceria Battery-like electrodes NiO, 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 spectroscopy 2021-05 2021-04-12T19:18:40Z 2019-04-15 article ARAðJO, 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. 0272-8842 https://repositorio.ufrn.br/handle/123456789/32165 10.1016/j.ceramint.2018.12.222 en Elsevier
institution Repositório Institucional
collection RI - UFRN
language English
topic Powder synthesis
NiOCeO2
Doped ceria
Battery-like electrodes
spellingShingle Powder synthesis
NiOCeO2
Doped ceria
Battery-like electrodes
Paskocimas, Carlos Alberto
Araújo, Allan Jedson Menezes de
Silva, Vinícius Dias
Sousa, Angel Roberta Oliveira de
Grilo, João Paulo de Freitas
Simões, Thiago Araújo
Macedo, Daniel Araújo de
Nascimento, Rubens Maribondo do
Battery-like behavior of Ni-ceria based systems: Synthesis, surface defects and electrochemical assessment
description NiO, 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 spectroscopy
format article
author Paskocimas, Carlos Alberto
Araújo, Allan Jedson Menezes de
Silva, Vinícius Dias
Sousa, Angel Roberta Oliveira de
Grilo, João Paulo de Freitas
Simões, Thiago Araújo
Macedo, Daniel Araújo de
Nascimento, Rubens Maribondo do
author_facet Paskocimas, Carlos Alberto
Araújo, Allan Jedson Menezes de
Silva, Vinícius Dias
Sousa, Angel Roberta Oliveira de
Grilo, João Paulo de Freitas
Simões, Thiago Araújo
Macedo, Daniel Araújo de
Nascimento, Rubens Maribondo do
author_sort Paskocimas, Carlos Alberto
title Battery-like behavior of Ni-ceria based systems: Synthesis, surface defects and electrochemical assessment
title_short Battery-like behavior of Ni-ceria based systems: Synthesis, surface defects and electrochemical assessment
title_full Battery-like behavior of Ni-ceria based systems: Synthesis, surface defects and electrochemical assessment
title_fullStr Battery-like behavior of Ni-ceria based systems: Synthesis, surface defects and electrochemical assessment
title_full_unstemmed Battery-like behavior of Ni-ceria based systems: Synthesis, surface defects and electrochemical assessment
title_sort battery-like behavior of ni-ceria based systems: synthesis, surface defects and electrochemical assessment
publisher Elsevier
publishDate 2021
url https://repositorio.ufrn.br/handle/123456789/32165
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