Deng Xianyu, Zhang Jianjun, Qi Kezhen, Liang Guijie, Xu Feiyan, Yu Jiaguo
Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430078, PR China.
College of Pharmacy, Dali University, Dali, 671003, PR China.
Nat Commun. 2024 Jun 5;15(1):4807. doi: 10.1038/s41467-024-49004-7.
Constructing S-scheme heterojunctions proves proficient in achieving the spatial separation of potent photogenerated charge carriers for their participation in photoreactions. Nonetheless, the restricted contact areas between two phases within S-scheme heterostructures lead to inefficient interfacial charge transport, resulting in low photocatalytic efficiency from a kinetic perspective. Here, InO/NbO S-scheme heterojunctions are fabricated through a straightforward one-step electrospinning technique, enabling intimate contact between the two phases and thereby fostering ultrafast interfacial electron transfer (<10 ps), as analyzed via femtosecond transient absorption spectroscopy. As a result, powerful photo-electrons and holes accumulate in the NbO conduction band and InO valence band, respectively, exhibiting extended long lifetimes and facilitating their involvement in subsequent photoreactions. Combined with the efficient chemisorption and activation of stable CO on the NbO, the resulting InO/NbO hybrid nanofibers demonstrate improved photocatalytic performance for CO conversion.
构建S型异质结被证明能够有效地实现光生载流子的空间分离，使其参与光反应。然而，S型异质结构中两相之间有限的接触面积导致界面电荷传输效率低下，从动力学角度来看，这会导致光催化效率较低。在此，通过一种简单的一步电纺丝技术制备了InO/NbO S型异质结，使两相能够紧密接触，从而促进超快界面电子转移（<10 ps），这是通过飞秒瞬态吸收光谱分析得出的。结果，强大的光电子和空穴分别积累在NbO导带和InO价带中，表现出较长的寿命，并促进它们参与随后的光反应。结合NbO上对稳定CO的有效化学吸附和活化，所得的InO/NbO混合纳米纤维在CO转化方面表现出改善的光催化性能。
