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Structural Thermal Stability of Graphene Oxide-Doped Copper-Cobalt Oxide Coatings as a Solar Selective Surface

Lookup NU author(s): Professor Chun Yang Yin, Dr Bee Min Goh

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Abstract

3d transition metal oxides based thin film coatings such as copper-cobalt oxides exhibit high absorption in the visible region and low emittance in the infrared to far-infrared region of the solar spectrum which is favourable for use as potential selective surface materials in photothermal devices. These materials have the potential to minimize heating while increasing absorption in the operative spectrum range and therefore achieve higher solar selectivity. A series of mixed copper-cobalt metal spinel oxides (CuxCoyOz) doped with graphene oxide thin films were deposited on commercial grade aluminium substrates using a sol-gel dip-coating technique at an annealing temperature of 500 degrees C in air for 1 h. Characterizations of the synthesized films were carried out by high temperature synchrotron radiation X-ray Diffraction (SRXRD), UV-Vis, Fourier Transform infrared spectroscopy (FTIR) and X-ray photoelectron microscopy (XPS) techniques. High thermal stability of coatings with multiple phases, binary and ternary metal oxides, was defined through SR-XRD study. FTIR analysis shows moderate (<80%) to high (up to 99%) reflectance in the infrared region while the UV-Vis investigations demonstrate that, in the visible region, solar absorption increases gradually (up to 95%) with the addition of graphene oxide to the CuxCoyOz coatings. With the incorporation of 1.5 wt.% of graphene oxide to the copper-cobalt oxide coatings, a high solar selectivity of 29.01 (the ratio of the average solar absorptance in visible and the average thermal emittance in infrared to far infrared region; a/e) was achieved. Copyright (C) 2016, The editorial office of Journal of Materials Science & Technology. Published by Elsevier Limited.


Publication metadata

Author(s): Rahman MM, Jiang ZT, Yin CY, Chuah LS, Lee HL, Amri A, Goh BM, Wood BJ, Creagh C, Mondinos N, Altarawneh M, Dlugogorski BZ

Publication type: Article

Publication status: Published

Journal: Journal of Materials Science & Technology

Year: 2016

Volume: 32

Issue: 11

Pages: 1179-1191

Print publication date: 01/11/2016

Online publication date: 13/09/2016

Acceptance date: 08/04/2016

ISSN (print): 1005-0302

Publisher: Zhongguo Kexueyuan Jinshu Yanjiusuo

URL: http://dx.doi.org/10.1016/j.jmst.2016.09.002

DOI: 10.1016/j.jmst.2016.09.002


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