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Location Effect in a Photocatalytic Hybrid System of Metal-Organic Framework Interfaced with Semiconductor Nanoparticles
Qi-chao Shang,Xin-zuo Fang,Hai-long Jiang,Qun Zhang*
Author NameAffiliationE-mail
Qi-chao Shang Hefei National Laboratory for Physical Sciences at the Microscale, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, ChinaDepartment of Chemical Physics, Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China  
Xin-zuo Fang Hefei National Laboratory for Physical Sciences at the Microscale, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, ChinaDepartment of Chemistry, CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China, Hefei 230026, China  
Hai-long Jiang Hefei National Laboratory for Physical Sciences at the Microscale, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, ChinaDepartment of Chemistry, CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China, Hefei 230026, China  
Qun Zhang* Hefei National Laboratory for Physical Sciences at the Microscale, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, ChinaDepartment of Chemical Physics, Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China qunzh@ustc.edu.cn 
Abstract:
We report an ultrafast spectroscopy investigation that addresses the subtle location effect in a prototypical semiconductor-MOF hybrid system with TiO2 nanoparticles being incorporated inside or supported onto Cu3(BTC)2, denoted as TiO2@Cu3(BTC)2 and TiO2/Cu3(BTC)2, respectively. By tracking in real time the interface electron dynamics in the hybrid system, we find that the interface states formed between TiO2 and Cu3(BTC)2 can act as an ef-fective relay for electron transfer, whose effciency rests on the relative location of the two components. It is such a subtle location effect that brings on difference in photocatalytic CO2 reduction using the two semiconductor-MOF hybrids. The mechanistic understanding of the involved interface electron-transfer behavior and effect opens a helpful perspective for rational design of MOF-based hybrid systems for photoelectrochemical applications.
Key words:  Metal-organic framework, Photocatalysis, Ultrafast spectroscopy, Transient absorption
FundProject:
半导体纳米颗粒/金属-有机骨架复合光催化体系中的位置效应
尚启超,房新佐,江海龙,张 群*
摘要:
本文采用超快瞬态吸收光谱技术研究了“半导体/金属-有机骨架(MOF)”复合体系中的位置效应. 半导体TiO2纳米颗粒被嵌入或担载于一种典型的MOF材料Cu3(BTC)2. 通过实时跟踪这两个复合体系中的电子动力学行为,发现半导体与MOF之间形成的界面态可作为高效的电子转移纽带,其效率与二组份的相对位置密切相关,从而导致这两个复合体系光催化CO2还原的性能差异. 本文对“半导体/MOF”复合体系中界面电子转移行为和效应的机理进行了解读,为基于MOF材料的光电化学应用提供了有益的设计思路.
关键词:  金属-有机骨架,光催化,超快光谱,瞬态吸收
DOI:10.1063/1674-0068/31/cjcp1803044
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