| DOI | Trouver le DOI : https://doi.org/10.1021/am405419k |
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| Auteur | Rechercher : Hall, David S.1; Rechercher : Lockwood, David J.2; Rechercher : Poirier, Shawn2; Rechercher : Bock, Christina1; Rechercher : MacDougall, Barry R.1 |
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| Affiliation | - Conseil national de recherches du Canada. Énergie, les mines et l'environnement
- Conseil national de recherches du Canada. Science des mesures et étalons
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| Format | Texte, Article |
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| Sujet | Alkalinity; Raman scattering; Raman spectroscopy; Surfaces; Vibrational spectroscopy; Electrochemical treatments; In-situ Raman spectroscopy; Nickel hydroxides; Raman scattering intensity; Spontaneous transformation; Stretching modes; Structural details; Vibrational modes; Nickel |
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| Résumé | The applications of in situ vibrational spectroscopy for identifying bulk and surface Ni(OH)2 are discussed. Raman spectra from α- and β-Ni(OH)2 samples immersed in water are generally similar to those collected from comparable dry samples. However, the Raman scattering intensities vary, and dry β-Ni(OH)2 additionally exhibits a surface O-H stretching mode at 3690 cm-1. Using in situ Raman spectroscopy, the spontaneous transformation of α-Ni(OH)2 to β-Ni(OH)2 in room-temperature water was monitored. Such transformations are conventionally performed in high-temperature alkaline media. An intralayer OH-diffusion model is proposed. Internal stresses at the α/β-phase boundary caused shifted peaks, higher order vibrational modes, and a new water peak at 3520 cm-1. We conclude that Raman spectroscopy may be applied to observe Ni(OH)2 materials in situ during chemical and electrochemical treatments. Such measurements provide information on the proportions of α- and β-Ni(OH)2 and their fine structural details with high sensitivity. © Published 2014 by the American Chemical Society. |
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| Date de publication | 2014 |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 21272202 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | dec76743-71cd-4b8c-a7ed-7405278e3854 |
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| Enregistrement créé | 2014-07-23 |
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| Enregistrement modifié | 2020-04-22 |
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