| DOI | Resolve DOI: https://doi.org/10.1021/am405419k |
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| Author | Search for: Hall, David S.1; Search for: Lockwood, David J.2; Search for: Poirier, Shawn2; Search for: Bock, Christina1; Search for: MacDougall, Barry R.1 |
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| Affiliation | - National Research Council of Canada. Energy, Mining and Environment
- National Research Council of Canada. Measurement Science and Standards
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| Format | Text, Article |
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| Subject | 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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| Abstract | 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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| Publication date | 2014 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 21272202 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | dec76743-71cd-4b8c-a7ed-7405278e3854 |
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| Record created | 2014-07-23 |
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| Record modified | 2020-04-22 |
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