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| Registros recuperados : 1 | |
| 1. |  | AMARAL, E. F. do; MELO, A. W. F. de; OLIVEIRA, C. H. A. de; BARDALES, N. G.; OLIVEIRA, T. K. de; MARTORANO, L. G.; FRANKE, I. L.; HAVERROTH, M. Desmatamento evitado na Terra Indígena Poyanawa, Mâncio Lima, AC, Brasil. Rio Branco, AC: Embrapa Acre, 2021. 1 folder.| Biblioteca(s): Embrapa Acre. |
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| Registros recuperados : 1 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
22/03/2022 |
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Data da última atualização: |
23/01/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 2 |
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Autoria: |
SILVA, P. F. da; GOMES, B. F.; LOBO, C. M. S.; CARMO, M.; ROTH, C.; COLNAGO, L. A. |
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Afiliação: |
LUIZ ALBERTO COLNAGO, CNPDIA. |
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Título: |
Composite graphite epoxy electrodes for in situ electrochemistry coupling with high resolution NMR. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
ACS Omega 2022, v. 7, 2022. |
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Páginas: |
4991-5000 |
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DOI: |
https://doi.org/10.1021/acsomega.1c05823 |
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Idioma: |
Inglês |
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Conteúdo: |
The in situ coupling between electrochemistry and spectrometric techniques can help in the identification and quantification of the compounds produced and consumed during electrochemical reactions. The combination of electrochemistry with nuclear magnetic resonance is quite attractive in this respect, but it has some challenges to be addressed, namely, the reduction in the quality of the NMR signal when the metallic electrodes are placed close to or in the detection region. Since NMR is not a passive technique, the convective effect of the magnetic force (magnetoelectrolysis), which acts by mixing the solution and increasing the mass transport, has to be considered. In seeking to solve the aforementioned problems, we developed a system of miniaturized electrodes inside a 5 mm NMR tube (outer diameter); the working and counter electrodes were prepared with a mixture of graphite powder and epoxy resin. To investigate the performance of the electrodes, the benzoquinone reduction to hydroquinone and the isopropanol oxidation to acetone were monitored. To monitor the alcohol oxidation reaction, the composite graphite−epoxy electrode (CGEE) surface was modified through platinization. The electrode was efficient for in situ monitoring of the aforementioned reactions, when positioned 1 mm above the detection region of the NMR spectrometer. The magnetoelectrolysis effect acts by stirring the solution and increases the reaction rate of the reduction of benzoquinone, because this reaction is limited by mass transport, while no effect on the reaction rate is observed for the isopropanol oxidation reaction. MenosThe in situ coupling between electrochemistry and spectrometric techniques can help in the identification and quantification of the compounds produced and consumed during electrochemical reactions. The combination of electrochemistry with nuclear magnetic resonance is quite attractive in this respect, but it has some challenges to be addressed, namely, the reduction in the quality of the NMR signal when the metallic electrodes are placed close to or in the detection region. Since NMR is not a passive technique, the convective effect of the magnetic force (magnetoelectrolysis), which acts by mixing the solution and increasing the mass transport, has to be considered. In seeking to solve the aforementioned problems, we developed a system of miniaturized electrodes inside a 5 mm NMR tube (outer diameter); the working and counter electrodes were prepared with a mixture of graphite powder and epoxy resin. To investigate the performance of the electrodes, the benzoquinone reduction to hydroquinone and the isopropanol oxidation to acetone were monitored. To monitor the alcohol oxidation reaction, the composite graphite−epoxy electrode (CGEE) surface was modified through platinization. The electrode was efficient for in situ monitoring of the aforementioned reactions, when positioned 1 mm above the detection region of the NMR spectrometer. The magnetoelectrolysis effect acts by stirring the solution and increases the reaction rate of the reduction of benzoquinone, because this react... Mostrar Tudo |
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Palavras-Chave: |
Electrochemical reactions; Magnetoelectrolysis; Nuclear magnetic resonance. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/232809/1/P-Composite-Graphite8722Epoxy-Electrodes-for-In-Situ-Electrochemistry.pdf
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Marc: |
LEADER 02349naa a2200241 a 4500
001 2141124
005 2024-01-23
008 2022 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1021/acsomega.1c05823$2DOI
100 1 $aSILVA, P. F. da
245 $aComposite graphite epoxy electrodes for in situ electrochemistry coupling with high resolution NMR.$h[electronic resource]
260 $c2022
300 $a4991-5000
520 $aThe in situ coupling between electrochemistry and spectrometric techniques can help in the identification and quantification of the compounds produced and consumed during electrochemical reactions. The combination of electrochemistry with nuclear magnetic resonance is quite attractive in this respect, but it has some challenges to be addressed, namely, the reduction in the quality of the NMR signal when the metallic electrodes are placed close to or in the detection region. Since NMR is not a passive technique, the convective effect of the magnetic force (magnetoelectrolysis), which acts by mixing the solution and increasing the mass transport, has to be considered. In seeking to solve the aforementioned problems, we developed a system of miniaturized electrodes inside a 5 mm NMR tube (outer diameter); the working and counter electrodes were prepared with a mixture of graphite powder and epoxy resin. To investigate the performance of the electrodes, the benzoquinone reduction to hydroquinone and the isopropanol oxidation to acetone were monitored. To monitor the alcohol oxidation reaction, the composite graphite−epoxy electrode (CGEE) surface was modified through platinization. The electrode was efficient for in situ monitoring of the aforementioned reactions, when positioned 1 mm above the detection region of the NMR spectrometer. The magnetoelectrolysis effect acts by stirring the solution and increases the reaction rate of the reduction of benzoquinone, because this reaction is limited by mass transport, while no effect on the reaction rate is observed for the isopropanol oxidation reaction.
653 $aElectrochemical reactions
653 $aMagnetoelectrolysis
653 $aNuclear magnetic resonance
700 1 $aGOMES, B. F.
700 1 $aLOBO, C. M. S.
700 1 $aCARMO, M.
700 1 $aROTH, C.
700 1 $aCOLNAGO, L. A.
773 $tACS Omega 2022$gv. 7, 2022.
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Embrapa Instrumentação (CNPDIA) |
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