Oxidation Kinetics of Nickel Particles: Comparison Between Free Particles and Particles in an Oxide Matrix

The degradation of selective solar absorbers through oxidation has been studied. We compare the oxidation kinetics of nickel particles of various sizes. Both free particles and particles embedded in an oxide matrix were studied. The oxidation kinetics of polycrystalline nickel nanorods was determine...

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Bibliographic Details
Published in:Solar energy 2000, Vol.68 (4), p.329-333
Main Authors: Karmhag, Richard, Tesfamichael, Tuquabo, Wäckelgård, Ewa, Niklasson, Gunnar A, Nygren, Mats
Format: Article
Language:English
Subjects:
Alumina
Applied sciences
Energy
Exact sciences and technology
High temperature effects
Infrared spectroscopy
Materials science
Natural energy
Nickel
Optical coatings
Oxidation
Polycrystalline materials
Rate constants
Solar collectors
Solar energy
Solar thermal conversion
Thermogravimetric analysis
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Summary:The degradation of selective solar absorbers through oxidation has been studied. We compare the oxidation kinetics of nickel particles of various sizes. Both free particles and particles embedded in an oxide matrix were studied. The oxidation kinetics of polycrystalline nickel nanorods was determined by IR spectroscopy in the temperature range 300–500°C. The particles were oxidized when situated in the porous alumina matrix of an electrochemically deposited solar absorber coating. The oxidation kinetics was compared to that of free nanometer-particles at the same temperature and to micron-sized polycrystalline nickel particles, which were studied by thermogravimetry in a wider temperature range. It was found that the rate constant was markedly lower for the particles in the matrix. Implications for the durability of selectively solar absorbing coatings are discussed.
ISSN:0038-092X
1471-1257
DOI:10.1016/S0038-092X(00)00025-6