Dynamics of Electron Transfer in CdS Photocatalysts Decorated with Various Noble Metals

被引:29
作者
Meng, Zheng [1 ]
Zhang, Jianjun [1 ]
Jiang, Chenchen [1 ]
Trapalis, Christos [2 ]
Zhang, Liuyang [1 ]
Yu, Jiaguo [1 ]
机构
[1] China Univ Geosci, Fac Mat Sci & Chem, Lab Solar Fuel, 68 Jincheng St, Wuhan 430078, Peoples R China
[2] Inst Nanosci & Nanotechnol, Mat Lab, NCSR Demokritos, Aghia Paraskevi 15343, Atttikis, Greece
基金
中国国家自然科学基金;
关键词
electron backflow; electron transfer dynamics; femtosecond transient absorption spectroscopy; noble metal; Schottky barrier; CHARGE SEPARATION; NANOSHEETS; TIO2;
D O I
10.1002/smll.202308952
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
To address charge recombination in photocatalysis, the prevalent approach involves the use of noble metal cocatalysts. However, the precise factors influencing this performance variability based on cocatalyst selection have remained elusive. In this study, CdS hollow spheres loaded with distinct noble metal nanoparticles (Pt, Au, and Ru) are investigated by femtosecond transient absorption (fs-TA) spectroscopy. A more pronounced internal electric field leads to the creation of a larger Schottky barrier, with the order Pt-CdS > Au-CdS > Ru-CdS. Owing to these varying Schottky barrier heights, the interface electron transfer rate (K-e) and efficiency (eta(e)) of metal-CdS in acetonitrile (ACN) exhibit the following trend: Ru-CdS > Au-CdS > Pt-CdS. However, the trends of K-e and eta(e) for metal-CdS in water are different (Ru-CdS > Pt-CdS > Au-CdS) due to the influence of water, leading to the consumption of photogenerated electrons and affecting the metal/CdS interface state. Although Ru-CdS displays the highest K-e and eta(e), its overall photocatalytic performance, particularly in H-2 production, lags behind that of Pt-CdS due to the electron backflow from Ru to CdS. This work offers a fresh perspective on the origin of performance differences and provides valuable insights for cocatalyst design and construction.
引用
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页数:10
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