Boosting Photocatalytic Hydrogen Production of a Metal–Organic Framework Decorated with Platinum Nanoparticles: The Platinum Location Matters

作者：Juan‐Ding Xiao, Qichao Shang, Yujie Xiong, Qun Zhang, Yi Luo, Shu‐Hong Yu, Hai‐Long Jiang · 发表于：Angewandte Chemie International Edition · 年份：2016 · DOI：10.1002/anie.201603990 · 被引用次数：709 · 研究领域：Metal-Organic Frameworks: Synthesis and Applications、Advanced Photocatalysis Techniques、Catalytic Processes in Materials Science

Improving the efficiency of electron-hole separation and charge-carrier utilization plays a central role in photocatalysis. Herein, Pt nanoparticles of ca. 3 nm are incorporated inside or supported on a representative metal-organic framework (MOF), UiO-66-NH2 , denoted as Pt@UiO-66-NH2 and Pt/UiO-66-NH2 , respectively, for photocatalytic hydrogen production via water splitting. Compared with the pristine MOF, both Pt-decorated MOF nanocomposites exhibit significantly improved yet distinctly different hydrogen-production activities, highlighting that the photocatalytic efficiency strongly correlates with the Pt location relative to the MOF. The Pt@UiO-66-NH2 greatly shortens the electron-transport distance, which favors the electron-hole separation and thereby yields much higher efficiency than Pt/UiO-66-NH2 . The involved mechanism has been further unveiled by means of ultrafast transient absorption and photoluminescence spectroscopy.