1996
DOI: 10.1016/0013-4686(95)00282-j
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Characterisation of new nickel hydroxides during the transformation of α Ni(OH)2 to β Ni(OH)2 by ageing

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Cited by 103 publications
(81 citation statements)
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“…This peak has previously been variously assigned to adsorbed H 2 O, crystal defects, impurities, surface OH groups and the O−H stretch for a new crystal phase, β bc -Ni(OH) 2 [52,159,228]. However, it is also associated with selective XRD line broadening, which affects only the diffraction peaks that involve the crystallographic c-axis [38,52].…”
Section: Raman-active Vibrational Modes Of β-Ni(oh)mentioning
confidence: 95%
See 1 more Smart Citation
“…This peak has previously been variously assigned to adsorbed H 2 O, crystal defects, impurities, surface OH groups and the O−H stretch for a new crystal phase, β bc -Ni(OH) 2 [52,159,228]. However, it is also associated with selective XRD line broadening, which affects only the diffraction peaks that involve the crystallographic c-axis [38,52].…”
Section: Raman-active Vibrational Modes Of β-Ni(oh)mentioning
confidence: 95%
“…Raman spectroscopy measurements show that the removal of intercalated nitrate anions is much faster than the dehydration process [94,159]. This may be due to mechanical stresses from the size mismatch of the incorporated nitrate anions.…”
Section: (D) Chemical Ageingmentioning
confidence: 99%
“…Studies of electrodeposited amorphous α-Ni(OH)2 and its ageing to β-Ni(OH)2 in basic electrolytes suggested that oxygen evolution occurred at lower onset potential for β-Ni(OH)2/β-Ni(O)OH. 18,[21][22][23][24][25][26][27][28] Yachandra and Nocera challenged this notion by correlating structure to activity in a nickel-borate oxygen evolution catalyst. 29 Dai established that crystalline Fe-doped α-Ni(OH)2 on carbon nanotubes is more active than the equivalent β-phase material.…”
Section: Raman Spectramentioning
confidence: 99%
“…que estão intercalados e/ou adsorvidos no material, torna a espectroscopia no IV uma técnica de caracterização muito limitada, com muitos picos sobrepostos de difícil identificação, inclusive a quantidade de espécies intercaladas pode ser facilmente detectada por experimentos termogravimétricos, 15 fornecendo informações indiretas quanto à fase estrutural, uma vez que a , atribuídas ao estiramento -OH na superfície do cristal e entre as lamelas, respectivamente. 16 Devido ao maior ordenamento da fase b, essas bandas são estreitas e intensas, podendo ser facilmente diferenciada da fase a. Outras bandas podem ser encontradas a baixas frequências, como em 450 e 510 cm -1 ; essas bandas são atribuídas, respectivamente, ao estiramento Ni-O e aos defeitos estruturais. Esses defeitos podem ser descritos como a ausência de átomos de hidrogênio ou hidroxilas na matriz do hidróxido de níquel.…”
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