Applications of in situ Raman spectroscopy for identifying nickel hydroxide materials and surface layers during chemical aging

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DOIResolve DOI: http://doi.org/10.1021/am405419k
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TypeArticle
Journal titleACS Applied Materials and Interfaces
ISSN1944-8252
Volume6
Issue5
Pages31413149; # of pages: 9
SubjectAlkalinity; 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
AbstractThe 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.
Publication date
LanguageEnglish
AffiliationEnergy, Mining and Environment; Measurement Science and Standards; National Research Council Canada
Peer reviewedYes
NPARC number21272202
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Record identifierdec76743-71cd-4b8c-a7ed-7405278e3854
Record created2014-07-23
Record modified2016-05-09
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