Background: Bimetallic nanocomposites have currently gained significant importance for
enhanced catalytic applications relative to monometallic analogues. The synergistic interactions modified
electronic and optical properties in the bimetallic (M1@M2) structural morphology e.g., coreshell
/alloy nanostructures resulting in a better co-catalytic performance for TiO2 photocatalysis.
Objective: Hence, this article discusses the preparation, characterization, and co-catalytic activity of
different bimetallic nanostructures namely, Cu@Zn, Pd@Au, Au@Ag, and Ag@Cu, etc.
Methods: These bimetallic co-catalysts deposited on TiO2 possess the ability to absorb visible light
due to surface plasmonic absorption and are also expected to display the new properties due to synergy
between two distinct metals. As a result, they reveal the highest level of activity than the monometal
Results: Their optical absorption, emission, charge carrier dynamics, and surface structural morphology
are explained for the improved photocatalytic activity of M1@M2 loaded TiO2 for the hydrogenation
of certain organic compounds e.g., quinoline, crotonaldehyde, and 1,3-dinitrobenzene, etc. under
UV/ visible light irradiation.
Conclusion: It was revealed that the use of bimetallic core@shell co-catalyst for hydrogenation of
important industrial organics by M1@M2-TiO2 nanocomposite demonstrates beneficial reactivity in
many instances relative to conventional transition metal catalysts.