Abstract
Designing and accumulating quantum dots (QD) onto layered double hydroxide (LDH) for the photocatalytic production of H2 and H2O2 is a formidable task. Here, we intended the synthesis procedure of CdMoSe-QD (CMS)-incorporated NiV-LDH (NV) through a facile in situ reflux method and explored the photocatalytic activities of the CMS/NV (CNV) heterostructure. CNV-1 exhibits a large interface contact area and assures excellent interfacial charge transfer ability. Moreover, CNV-1 exhibits outstanding H2 and H2O2 production rates, i.e., 6.4 and 2.5 times higher than that of pristine NV, respectively, due to formation of an S-scheme heterojunction between NV and CMS. Both NV and CMS function as n-type semiconductors and extend photoresponse to visible regions. The CNV-1 composite achieves 1.67% SCC for photocatalytic H2O2 generation and 7.36% ACE for photocatalytic H2 evolution. The excellent activity is ascribed to higher anodic photocurrent, the quantum confinement effect of CMS, large surface-active sites, and delayed recombination of excitons as supported by PL and EIS measurements. Further, the S-scheme mechanism was authenticated through a radical scavenging test and work function, evaluated by UPS measurement. Altogether, this study exemplifies the concepts of designing a CNV heterostructure, which operates via an n-n-based S-scheme mechanism and aims to enhance photocatalytic H2 and H2O2 production.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call