Ubaid Ullah Khan is currently pursuing his Ph.D. at Shandong University in Jinan, China. He is a chemist and researcher with a strong interest in nanomaterials, photocatalysis, environmental chemistry, and materials science. He earned his M.Phil. in Chemistry from the University of Lakki Marwat, Pakistan, where his research focused on the synthesis, characterization, and biological applications of CuO and Ni-doped CuO nanoparticles. My research interests span nanomaterial synthesis and characterization, photocatalysis, wastewater treatment, solar-energy materials, metal–organic frameworks (MOFs), and sustainable energy technologies. He has contributed to research on nanomaterials, photocatalysis, wastewater treatment, antibacterial materials, and solar-cell technologies. His current Ph.D. research interests are centered on developing advanced functional materials for sustainable energy conversion, with particular emphasis on photoelectrochemical water splitting and related catalytic systems.