Abstract
Molybdenum black has been produced in thin coating form (3 μm) on prepared aluminium surfaces by the method of electrodeposition. The microstructure of the coating has been identified as one of flat irregular platelets belonging to a material which can be described as quasi-amorphous. Its chemical composition is 90 wt% MoO2 · 2 H2O and 10 wt% Ni(OH)2 · Mo-black appears to be a good absorber of solar radiation. Absorbance values as high as 93% have been measured for the visible region of the solar energy spectrum. It has been identified that the coating is of semiconducting nature and that the dominant conduction mechanism is the Schottky emission mechanism. Photoelectrochemical measurements have finally provided evidence for photon-induced electrochemical processes at the Mo-black electrodes.
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