Solar Selective Coatings Based on Nickel Oxide Obtained via Spray Pyrolysis

Abstract

The paper presents the optimization process for obtaining NiO thin layers on copper substrate for solar absorber coatings, using an inexpensive and up-scalable technique: spray pyrolysis deposition (SPD). Efficient selective coatings must present a high absorption coefficient of the incident solar irradiation, and low emission of heat. The solar selective coatings design involves tailoring the surface properties for superior optical properties. The deposition parameters were varied for maximizing the solar absorbance and minimizing the thermal emittance. The film morphology was controlled using copolymers of the maleic anhydride as additives into the precursors' solution. The structural and surface properties of the films were investigated by X-ray diffraction and atomic force microscopy, respectively. The Cu/CuO(x)/NiO solar absorber shows good values for the solar absorptance (alpha(s) = 0.95) and thermal emittance (epsilon(T) = 0.05) compared with the ones obtained by other methods employed in literature and new additives are recommended in tailoring the surface of solar selective coatings.

Developments in the synthesis of flat plate solar selective absorber materials via sol–gel methods: A review

“…The solutions used were a mixture of nickel acetate and copper acetate in water-ethanol solution based on the previously optimized conditions [87]. The best selectivity (36.4) was obtained from film with highest roughness (precursors with 40% ethanol).…”

Assessment of CuO thin films for its suitablity as window absorbing layer in solar cell fabrications

“…Copper oxide thin films have wide range of applications in energy harvesting, storage and solar selective absorbers. The use of single layer of black copper/nickel films based on copper oxides and nickel oxides for solar coatings was reported earlier [17]. Recent research efforts on CuO based solar cell in the configuration of p-CuO/n-ZnO:Sn was developed and its energy conversion efficiency was reported (h = 0.232%) [18].…”

Construcción e implementación de equipos de depósito químico usando las técnicas: Depósito químico de vapor asistido por aerosol (AACVD) y Sol –Gel por inmersión

“…Los rangos de operación para el funcionamiento del equipo AACVD construido en la UTP se presentan en la Tabla 2.1 y se determinaron de acuerdo a la revisión bibliográfica (Miki-Yoshida & Andrade, 1993)-(Miki-Yoshida, y otros, 2006), (Voinea, Ienei, Bogatu, & Duta, 2009)-(Esparza-Ponce, Reyes-Rojas, Antúnez-Flores, & Miki-Yoshida, 2003). Este ejercicio permitió determinar el rango de temperatura del sustrato, que generalmente es empleado para la técnica AACVD, así como de spray pirolisis.…”