Quantum dots (QDs) are attractive systems for potential applications in future solar energy technologies, due to their optical properties which are tunable as a function of size and composition. In this study, we synthesized PbS QDs with first excitonic peak in the range 1060 to 1300 nm using a PbCl2/sulfur molar ratio of 10:1. The first excitonic absorption peak from 1300 to 950 nm of the PbS/CdS core/shell QDs can be further synthesized via the cation exchange approach. Our method resulted in high quantum yield, good stability, monodisperse QD solutions with a full surface coverage by excess Cd cations. In addition, we used our core/shell QDs in a photoelectrochemical cell for hydrogen generation. This heterostructure exhibited a saturated photocurrent as high as 3.3 mA cm-2, leading to ∼29 ml cm-2 d-1 hydrogen generation, indicating the strong potential of our core/shell QDs for applications in water splitting.
Autori: | Vomiero, A. (Corresponding) |
Data di pubblicazione: | 2016 |
Titolo: | Green synthesis of near infrared core/shell quantum dots for photocatalytic hydrogen production |
Rivista: | NANOTECHNOLOGY |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1088/0957-4484/27/49/495405 |
Volume: | 27 |
Appare nelle tipologie: | 2.1 Articolo su rivista |