Present investigation is aimed to enhance the efficiency of a glazed solar air collector by absorber plate coating with nano-enhanced black paint. Graphene, CuO, and CeO2 were used with black paint as coating material to enhance the thermal conductivity. The experimental analysis showed the absorber's thermal performance and efficiency of heat transmission to surrounding air. It was noticed that thermal efficiency was amended by 3.6% on average when using the graphene/CuO-doped black paint coating compared to graphene and graphene-cerium oxide black paint coating. Coating of black paint has a more significant entropy generation of 0.1558 to 0.8457, while graphene/CuO black paint has the lowest. Investigation into entropy formation revealed that entropy production improved with air mass flow rate in every case, such as the absorber plate. Compared with different coating materials such as graphene and graphene/CeO2/black paint coating, it has established that the graphene/CuO/black paint increased energy efficiency by 4.4%.