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Thermal-, photo- and electron-induced reactivity of hydrogen species on rutile TiO_2(110) surface: Role of oxygen vacancy

查看全文 作　　者：Zongfang [1]Wu;Feng [1]Xiong;Zhengming [1]Wang;Weixin [1]Huang 高影响力作者 机构地区：[1]Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China高影响力机构 出　　处：《Chinese Chemical Letters》索引2018年第29卷第6期,共5页高影响力期刊 基　　金：financially supported by the National Natural Science Foundation of China (Nos. 21525313, 21761132005);Chinese Academy of Sciences (No. KJZD-EW-M03);MOE Fundamental Research Funds for the Central Universities (No. WK2060030017);Collaborative Innovation Center of Suzhou Nano Science and Technology 摘　　要：Interaction of hydrogen with TiO_2 plays a vital role in TiO_2-based photocatalysis and thermal catalysis. In this work, we compared thermal-, photo-, and electron-induced reactivity of various types of hydrogen species on a rutile TiO_2(110) surface formed by atomic H exposure at 320 and 115 K by means of thermal desorption spectroscopy, X-ray photoelectron spectroscopy and low energy electron diffraction. Atomic H interaction with rutile TiO_2(110) at 115 K forms surface TiààH hydride, surface hydroxyl group, and chemisorbed water. Upon heating, surface TiààH hydride reacts to produce H2 while surface hydroxyl groups react to form both water and H2. Atomic H interaction with rutile TiO_2(110) at 320 K strongly reduces TiO_2 due to the continuous formation and desorption of water and forms surface hydroxyl groups and likely subsurface/bulk hydrogen species. Upon heating, hydrogen forms as the only gas-phase product and its desorption activation energy decreases with the subsurface/bulk reduction extent of rutile TiO_2(110). Surface Ti-H hydride exhibits photo-induced reactivity while both surface TiààH hydride and surface hydroxyl group exhibit electro-induced reactivity. These results have important implications for understanding the hydrogen-involved thermal and photo reactions on TiO_2-based catalysts. 关 键 词：TiO2 氢化物 金红石 氢氧根 光电子 表面 反应 相片
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