Electrodeposition of Selective Absorber Coatings Based on Black Nickel for Solar - Thermal Energy Conversion
In this work, bright and black nickel coatings were electrodeposited onto copper and stainless steel substrates with an area of 16 cm2. The experiments were performed at room temperature using electrolytes from nickel sulfate and nickel chloride salts. For the characterization of the coatings, several techniques were used, as profilometry, scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The optical properties of the coatings were measured by reflectance spectroscopy. For the evaluation of the energy conversion efficiency, the electrodeposited coatings were irradiated at 1 sun and the heating of an aqueous was measured as a function of film properties.