Isothermal decomposition kinetics of nickel (II) hydroxide powder

JOURNAL OF ALLOYS AND COMPOUNDS

卷:644

Article

Carney, C. S.^1,2  Chinn, R. E.¹  Dogan, O. N.¹  Gao, M. C.^1,2 

[1] US DOE, Natl Energy Technol Lab, Albany, OR 97321 USA

[2] AECOM, Albany, OR USA

关键词: Nickel hydroxide;    Thermal decomposition kinetics;    Solid state reactions;    Kinetics;    Thermal analysis;    X-ray diffraction;   

DOI  :  10.1016/j.jallcom.2015.03.256

来源: Elsevier

【 摘 要 】

Nickel (II) hydroxide powder was investigated by thermogravimetry for isothermal decomposition kinetics and verification of the Ni-O-H ternary phase diagram at low temperatures. The activation energy and frequency factor were measured as E-a = 134 kJ/mol and A = 1.27 x 10(10) s(-1), respectively. The validity of the first-order random nucleation model was confirmed, as opposed to diffusion and or moving-boundary models. The dependence of TGA results on specimen size was noted. The Ni-Ni(OH)(2)-NiO phase triangle was confirmed. Accordingly, a thermodynamic description of the system was established in the Ni-rich corner, and the isotherm at room temperature is calculated. (C) 2015 Elsevier B.V. All rights reserved.

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