Quadruple metals-based layered structure as the photocatalyst for conversion of carbon dioxide into a value-added carbon monoxide with high selectivity and efficiency
Metals-based layered structures is promising structures for photocatalysts, but ones enabling a complete conversion of carbon dioxide (CO2) into a value-added carbon monoxide (CO) are still limited. Herein, we report that the quadruple metals-based layered structure, composed of Ni, Mg, Ga, and Al, allows the photocatalytic conversion of CO2 into CO with the high selectivity close to 100% in the presence of water (H2O). The shifted oxidation states on Ni and Mg ions than bivalent states lead to an increment in electronegativity for their neighboring oxygen (O) while Ga and Al ions maintain trivalent states, thereby enabling O to adsorb a high amount of CO2. Furthermore, the quadruple metals-based layered structure without any use of scavengers is proven to give an approximately 2-fold increase in photocatalytic activity compared to those for bi or triple metals-based ones.