| Summary: | 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.
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