Atomically Precise Bimetallic Nanoclusters as Photosensitizers in Photoelectrochemical Cells

被引:21
作者
Wang, Yu [1 ,2 ]
Liu, Xiao-He [1 ,2 ,3 ,4 ]
Kovalenko, Sergey A. [1 ,2 ]
Chen, Qing-Yun [3 ,4 ]
Pinna, Nicola [1 ,2 ]
机构
[1] Humboldt Univ, Inst Chem, Brook Taylor Str 2, D-12489 Berlin, Germany
[2] Humboldt Univ, IRIS Adlershof, Brook Taylor Str 2, D-12489 Berlin, Germany
[3] Xi An Jiao Tong Univ, IRCRE, Sch Energy & Power Engn, Xian 710049, Shaanxi, Peoples R China
[4] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Sch Energy & Power Engn, Xian 710049, Shaanxi, Peoples R China
关键词
bimetallic nanoclusters; energy conversion; nanotubes; photoelectrochemical cells; photosensitizers; SENSITIZED SOLAR-CELLS; EXCITED-STATE BEHAVIOR; TIO2 NANOTUBE ARRAYS; SILVER NANOCLUSTERS; RELAXATION DYNAMICS; HYDROGEN GENERATION; GOLD NANOPARTICLES; METAL NANOCLUSTERS; OPTICAL-PROPERTIES; SITE PREFERENCE;
D O I
10.1002/chem.201900008
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The atomically precise bimetallic nanocluster (NC), Au24Ag28 (PhCC)(20)(SPy)(4)Cl-2 (1) (Py = pyridine), was employed for the first time as a stable photosensitizer for photoelectrochemical applications. The sensitization of TiO2 nanotube arrays (TNA) with 1 greatly enhances the light-harvesting ability of the composite because 1 shows a high molar extinction coefficient (e) in the UV/Vis region. Compared to a more standard Au-25(SG)(18)-TNA (2-TNA; SG = glutathione) composite, 1-TNA shows a much better stability under illumination in both neutral and basic conditions. The precise composition of the photosensitizers enables a direct comparison of the sensitization ability between 1 and 2. With the same cluster loading, the photocurrent produced by 1-TNA is 15 times larger than that of 2-TNA. The superior performance of 1-TNA over 2-TNA is attributed not only to the higher light absorption ability of 1 but also to the higher charge-separation efficiency. Besides, a ligand effect on the stability of the photoelectrode and charge-transfer between the NCs and the semiconductor is revealed. This work paves the way to study the role of metal nanoclusters as photosensitizers at the atomic level, which is essential for the design of better material for light energy conversion.
引用
收藏
页码:4814 / 4820
页数:7
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