In<sub>2</sub>S<sub>3</sub>/Cd<sub>0.9</sub>Zn<sub>0.1</sub>S Heterojunction for Efficient Photocatalytic Formic Acid Decomposition to Syngas (H<sub>2</sub> + CO) under Visible Light
Jinbao Wu, Taotao Wang, Li Zhang, Pingwu Du
Abstract
Photocatalytic decomposition of formic acid (FA) to syngas (H 2 + CO) is a valuable sustainable energy conversion strategy. In this study, we combine In 2 S 3 nanoparticles with Cd 0.9 Zn 0.1 S nanorods (In 2 S 3 /CZS) to construct heterojunctions for directly converting formic acid to syngas under visible light (λ > 420 nm) irradiation. The In 2 S 3 /CZS composite was facilely synthesized by a hydrothermal reaction. In 2 S 3 /CZS showed excellent photocatalytic activity for FA decomposition. The optimal generation rates of H 2 and CO can reach 200 and 204 μmol·h –1, respectively, which is one of the best performances in the photocatalytic decomposition of formic acid for synthesizing syngas. Under irradiation with 420 nm monochromatic light, H 2 and CO exhibit apparent quantum yields of 9.7% and 10.6%, respectively. The test date confirms the formation of a type II heterojunction between Cd 0.9 Zn 0.1 S nanorods and In 2 S 3 nanoparticles. It can effectively promote the transport and separation of the interfacial charges. This work also provides insight into the development of an efficient photocatalytic system for syngas production.