Zeng Shijia, Tan Wenjiang, Si Jinhai, Mao Liuhao, Shi Jinwen, Li Yuren, Hou Xun
Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Laboratory of Information Photonic Technique, School of Electronics and Information Engineering, Xi'an Jiaotong University, 28 Xianning Road, Xi'an710049, China.
International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an710049, China.
J Phys Chem Lett. 2022 Oct 6;13(39):9096-9102. doi: 10.1021/acs.jpclett.2c02147. Epub 2022 Sep 26.
InP/ZnS core/shell quantum dots have shown extraordinary application potential in photocatalysis. In this work, we demonstrated by ultrafast spectroscopy that the electron transfer ability of InP/ZnSe/ZnS core/shell/shell quantum dots was better than that of InP/ZnS quantum dots, because the introduction of ZnSe midshell resulted in improved passivation and greater exciton delocalization. The temperature-dependent PL spectra indicate that the exciton-phonon coupling strength and exciton binding energy of InP/ZnSe/ZnS quantum dots are smaller than those of InP/ZnS quantum dots. Further photocatalytic hydrogen evolution testing revealed that the photocatalytic activity of InP/ZnSe/ZnS quantum dots was significantly higher than that of InP/ZnS quantum dots, and InP/ZnSe/ZnS quantum dots even demonstrated improved stability. This research deepened our understanding of carrier dynamics and charge separation of InP/ZnSe/ZnS quantum dots, especially highlighting the application potential of InP/ZnSe/ZnS quantum dots in photocatalytic hydrogen evolution.
磷化铟/硫化锌核壳量子点在光催化领域展现出了非凡的应用潜力。在本研究中，我们通过超快光谱证明，磷化铟/硒化锌/硫化锌核壳壳量子点的电子转移能力优于磷化铟/硫化锌量子点，这是因为引入硒化锌中间壳层导致了更好的钝化效果以及更大程度的激子离域。温度依赖的光致发光光谱表明，磷化铟/硒化锌/硫化锌量子点的激子-声子耦合强度和激子束缚能比磷化铟/硫化锌量子点更小。进一步的光催化析氢测试表明，磷化铟/硒化锌/硫化锌量子点的光催化活性显著高于磷化铟/硫化锌量子点，并且磷化铟/硒化锌/硫化锌量子点甚至表现出了更好的稳定性。本研究加深了我们对磷化铟/硒化锌/硫化锌量子点载流子动力学和电荷分离的理解，尤其突出了磷化铟/硒化锌/硫化锌量子点在光催化析氢方面的应用潜力。
