Characterisation of new nickel hydroxides during the transformation of α Ni(OH)2 to β Ni(OH)2 by ageing
✍ Scribed by M.C. Bernard; P. Bernard; M. Keddam; S. Senyarich; H. Takenouti
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 279 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
The aim of this paper is to characterise the compounds formed by the ageing of a NI(OH), in 5 M KOH at 70°C. The final product of this treatment is known as the fi Ni(OH), phase, but with the ageing period, a progressive change of electrochemical reactivity as well as a textural and structural evolution are observed. The products obtained are stable in time once the ageing is stopped and are not a mere mixture of a and /I but single phase nickel hydroxides whose properties are intermediate between those of a and b Ni (OH),. Intermediate forms of nickel hydroxide, whose specific features seem to be the crystallites size and the quantity of absorbed nitrate ions, will be called "badly crystallised /I" or /ibs as proposed by Delmas et al.