Quantum Dots/CNT Nanocomposite Photocathode for Improvement on Charge Overpotential in Photoelectrochemical Li-O2 Batteries

• Main Authors: Yu-Hsiang Chen, 陳昱翔
• Other Authors: 魏大華
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/n4py3z

碩士 === 國立臺北科技大學 === 機械工程系機電整合碩士班 === 106 === Li-ion battery plays a significant role in portable electronic devices in the running world. However, its capacity and energy density are still insufficient to provide battery for mainstream electric vehicles in the future. Li-oxygen (Li-O2) battery fulfills these energy requirements. However, the overpotential and stability still need to be improved. Hence, we developed a photocathode nanocomposite material composed of Cadmium Selenide/Zinc Sulfide Quantum Dots with Carbon Nanotube (CdSe/ZnS QDs@CNT) for an efficient and tunable performance of the photoelectrochemical Li−O2 battery system to overcome the key issue of overpotential. These 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 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 battery.