Solar absorptance of copper–cobalt oxide thin film coatings with nano-size, grain-like morphology: Optimization and synchrotron radiation XPS studies

A. Amri; X-F Duan; C-Y Yin; Z-T Jiang; M.M. Rahman; T. Pryor

doi:10.1016/j.apsusc.2013.01.081

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Solar absorptance of copper–cobalt oxide thin film coatings with nano-size, grain-like morphology: Optimization and synchrotron radiation XPS studies

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Solar absorptance of copper–cobalt oxide thin film coatings with nano-size, grain-like morphology: Optimization and synchrotron radiation XPS studies

A. Amri, X-F Duan, C-Y Yin, Z-T Jiang, M.M. Rahman and T. Pryor

Applied Surface Science, Vol.275, pp.127-135

2013

DOI: https://doi.org/10.1016/j.apsusc.2013.01.081

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Abstract

Copper–cobalt oxides thin films had been successfully coated on reflective aluminium substrates via a facile sol–gel dip-coating method for solar absorptance study. The optimum absorptance in the range of solar radiation is needed for further optimum design of this material for selective solar absorber application. Field emission scanning electron microscopy was used to characterize the surface morphology of the coating whereby nano-size, grain-like morphology was observed. Synchrotron radiation X-ray photoelectron spectroscopy was employed to analyze the electronic structure of the coated surface showing that the (i) oxygen consisted of lattice, surface and subsurface oxygen, (ii) copper consisted of octahedral and tetrahedral Cu+, as well as octahedral and paramagnetic Cu2+ oxidation states, and (iii) cobalt consisted of tetrahedral and paramagnetic Co(II), octahedral Co(III) as well as mixed Co(II,III) oxidation states. In order to optimize the solar absorptance of the coatings, relevant parameters such as concentrations of cobalt and copper, copper/cobalt concentration ratios and dip-speed were investigated. The optimal coating with α = 83.4% was produced using 0.25 M copper acetate and 0.25 M cobalt chloride (Cu/Co ratio = 1) with dip-speed 120 mm/min (four cycles). The operational simplicity of the dip-coating system indicated that it could be extended for coating of other mixed metal oxides as well.

Details

Title: Solar absorptance of copper–cobalt oxide thin film coatings with nano-size, grain-like morphology: Optimization and synchrotron radiation XPS studies
Authors/Creators: A. Amri (Author/Creator) - Riau University
X-F Duan (Author/Creator) - The University of Melbourne
C-Y Yin (Author/Creator) - Murdoch University
Z-T Jiang (Author/Creator) - Murdoch University
M.M. Rahman (Author/Creator) - Murdoch University
T. Pryor (Author/Creator) - Murdoch University
Publication Details: Applied Surface Science, Vol.275, pp.127-135
Publisher: Elsevier BV
Identifiers: 991005542572007891
Copyright: © 2013 Elsevier B.V.
Murdoch Affiliation: School of Chemical and Mathematical Science; School of Engineering and Energy
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 7 Engineering & Materials Science; 7.70 Thermodynamics; 7.70.1160 Solar Thermal Systems
Web Of Science research areas: Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter
ESI research areas: Materials Science