CdSe/ZnS QD@CNT nanocomposite photocathode for improvement on charge overpotential in photoelectrochemical Li-O2 batteries
Journal
Chemical Engineering Journal
Journal Volume
349
Pages
235-240
Date Issued
2018
Author(s)
Abstract
Li-ion batteries play a significant role in portable electronic devices in the running world. However, the limited energy density still needs to be improved for the growing future. Hence, we developed a photocathode nanocomposite material composed of Cadmium Selenide/Zinc Sulfide Quantum Dots with Carbon nanotube (CdSe/ZnS QD@CNT) for an efficient and tunable performance of the photoelectrochemical Li–O2 battery system to overcome the key issue of overpotential. The QD and CNT networks can provide efficient transportation paths of the electron–hole pairs and the O2 gas and lithium ions, respectively. The charging voltage of the photoelectrode is 2.65–4.0 V; therefore, decreased overpotential was due to efficient oxidation of Li2O2 by photoexcited electron–hole pairs by using QDs, resulting in a long-term operational stability over 100 cycles. On the basis of the advantages, the QDs exhibit efficient potential in Li–O2 batteries. © 2018 Elsevier B.V.
Subjects
Cadmium selenide; Carbon nanotube; Li–O2 battery; Photocatalyst; Quantum dots; Zinc sulfide
SDGs
Other Subjects
Cadmium compounds; Cadmium sulfide; Carbon nanotubes; Electrochemistry; Excitons; II-VI semiconductors; Lithium compounds; Lithium-ion batteries; Nanocomposites; Nanocrystals; Photocatalysts; Photocathodes; Semiconductor quantum dots; Sulfur compounds; Yarn; Zinc sulfide; Cadmium selenides; Cnt nano composites; Efficient oxidations; Operational stability; Photoelectrochemicals; Photoexcited electrons; Portable electronic devices; Tunable performance; Lithium-air batteries
Type
journal article