| Texto completo | |
| Autor(es): |
Goncalves, Josue M.
;
Lima, Irlan S.
;
Phakatkar, Abhijit H.
;
Pereira, Rafael S.
;
Martins, Paulo R.
;
Araki, Koiti
;
Angnes, Lucio
;
Shahbazian-Yassar, Reza
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | MATERIALS CHARACTERIZATION; v. 196, p. 9-pg., 2023-01-03. |
| Resumo | |
It has been long believed that colloidal nickel hydroxide nanoparticles are produced by the reaction of nickel salts, glycerol and potassium hydroxide known as the Tower method. In the present work, we challenge this belief and reveal the reasons for error in identification of nickel products produced by the Tower method. We propose that Ni-based precursor complexes are the primary products of the Tower method reaction, and these precursors undergo transition to layered Ni-glycerolate derivatives upon thermal treatment. We demonstrated the presence of Ni2+ coordinated to different types of O-donor ligands (glycerol, glycerolate ion, acetate ion and/or OH-) forming Ni-complex precursors. Using in-situ transmission electron microscopy, we showed that Ni-based precursor complexes can be converted to nickel nanoparticles upon exposure to electron beam, but no evidence of nickel hydroxide nanoparticle formation was found. The nickel hydroxide nanoparticles are only formed upon further reaction of Ni-glycerolate precursors with an aqueous alkaline solution. Those new findings shed light on the nature of the metal derivatives obtained by the reaction of Ni2+ and glycerol in the Tower method and provide more solid foundation to design electrode materials for batteries, supercapacitors, electrocatalysts and electrochemical sensors. (AU) | |
| Processo FAPESP: | 18/21489-1 - Nanotecnologia supramolecular: design, materiais e dispositivos |
| Beneficiário: | Henrique Eisi Toma |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 14/50867-3 - INCT 2014: Instituto Nacional de Ciência e Tecnologia de Bioanalítica |
| Beneficiário: | Marco Aurelio Zezzi Arruda |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 18/16896-7 - Desenvolvimento de sensores amperométricos e impedimétricos baseados em hidróxidos duplos de níquel e Vanádio (alfa-NixV1-x(OH)2) e seus nanocompósitos com grafite expansível/grafenos |
| Beneficiário: | Josué Martins Gonçalves |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 20/06176-7 - Estudo dos materiais de eletrodos de hidróxido lamelares com microscopia eletrônica de transmissão in situ |
| Beneficiário: | Josué Martins Gonçalves |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado |