文献类型：期刊文献

英文题名：Critical roles of co-catalysts for molecular hydrogen formation in photocatalysis

作者：Li, Yu Hang[1];Peng, Chao[2,3];Yang, Shuang[1];Wang, Hai Feng[2,3];Yang, Hua Gui[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Ctr Computat Chem, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[3]E China Univ Sci & Technol, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China

年份：2015

卷号：330

起止页码：120

外文期刊名：JOURNAL OF CATALYSIS

收录：;EI(收录号：20153101101420);WOS:【SCI-EXPANDED(收录号:WOS:000362603200011)】；

基金：This work was financially supported by the National Natural Science Foundation of China (21373083, 21303052), SRF for ROCS, SEM, SRFDP, the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, Program of Shanghai Subject Chief Scientist (15XD1501300), the Fundamental Research Funds for the Central Universities (WD1313009, 222201314035), and the Commission of Science and Technology of Shanghai Municipality (12ZR1442600). We also thank P. Hu for the calculations, and appreciate the help of W. Yuan and Y. Wang in conducting the (S)TEM measurements at Center for Electron Microscope in Zhejiang University.

语种：英文

外文关键词：Photocatalysis; TiO2 crystal facets; Molecular hydrogen formation; Density functional theory; Active sites; Platinum co-catalyst; Platinum monoxide co-catalyst

摘要：Surface atomic structure can play a critical role in the reactivity of materials, because many physicochemical processes occur at surfaces. As an important semiconductor material, titanium dioxide (TiO2) crystals with tailored facets have opened up intensive research in surface chemistry, such as photocatalytic hydrogen generation. However, the convincing measurement and explanation of the crystal facets effect for molecular hydrogen formation in photocatalysis has remained elusive. One longstanding controversy is between the exposed (001) and (101) facets. Here we demonstrate, through a combination of state-of-the-art electron microscopy and quantum chemical calculations, that the crystal facets of TiO2 do not play the critical role in photoreactivity; the bare TiO2 semiconductors without co-catalysts are catalytically inactive, whereas the location and species of the co-catalysts essentially determine the capacity for the hydrogen evolution reaction. Our results provide a unified explanation for the disparate results in the previous literature and highlight a feasible route to fabricating efficient photocatalysts. (C) 2015 Elsevier Inc. All rights reserved.