Solar coatings with high absorptance in the visible part of the solar spectrum and low IR emittance represent the active part of the solar-thermal panels. This property combination is ideally reached by cermets. The coatings must supplementary show good stability in extreme conditions of temperature, humidity and corrosive media.

Thin layers of black nickel are good candidates for IR absorbers used as active solar-thermal coatings. The absorptance/emittance properties combination depends on the cermet composition, thin layer thickness and, especially, on morphology. Optimized morphology can be reached, in electrochemical deposition processes, based on the precursors’ solution characteristics (nickel precursor salt and concentration, solvent and additives).

The deposition of Ni/NiOx cermets (on copper substrates) is reported in this study, using NiCl₂ aqueous solutions with different concentrations. Maleic anhydride/acid copolymers, with controlled water solubility, are used as additives in the electrolytic bath for morphology control. The addition of NaCl in the electrolytic bath is discussed both in terms of effects on the ionic strength and polymer dissociation and conformation.

The optimal electrochemical deposition parameters are obtained in voltammetry studies. The AFM images are used for morphology characterisation and UV-VIS-IR spectroscopy is used for the optical measurements.

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