Mesoporous TiO2 mixed crystals for photocatalytic pure water splitting  

介孔混晶TiO2光催化全分解水研究

作　　者：Lichao Wang Zhaozhong Xiao Ye Liu Shuang Cao Zhi Ma Lingyu Piao 王利超;肖召忠;刘叶;曹爽;马智;朴玲钰(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;CAS Key Laboratory of Standardization and Measurement for Nanotechnology,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology,Beijing 100190,China;School of Metallurgy and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China [2]CAS Key Laboratory of Standardization and Measurement for Nanotechnology,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology,Beijing 100190,China [3]School of Metallurgy and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China

出　　处：《Science China Materials》2020年第5期758-768,共11页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(21703046);the Ministry of Science and Technology of China(2016YFA0200902).

摘　　要：Semiconductor mesoporous single crystals have attracted considerable attention due to the merits of excellent light absorption ability and large surface area for photocatalysis capability.However,most of the materials have a relative large size(~um),which can hardly suppress the recombination of photogenerated electrons and holes.In this work,we synthesized a series of nano mesoporous TiO2 mixed crystals(brookite and rutile)with high carrier transfer efficiency,improved mass transfer and diffusion abilities,which are crucial for the outstanding photocatalytic performance.Meanwhile,the key factors in the growth process and mechanism of the mesoporous TiO2 mixed crystals were addressed.With the assistance of Pt nanoparticles,H2 and H2O2 production can be simultaneously achieved and the efficiencies can reach up to 9.46±0.56 and 3.29±1.28μmol mg^-1 h^-1,respectively.The H2 evolution rate is 2.8-fold higher than that of the reported TiO2 nanoparticle catalyst(3.34μmol mg^-1 h^-1).The excellent photocatalytic efficiency can be attributed to the special mixed crystal structure of the mesoporous TiO2 crystals.This work provides new ideas and guidance for precise synthesis of nano mesoporous TiO2 mixed crystals and enhancing their water splitting performance with high value-added products.半导体介孔单晶具有良好的光吸收能力和较大的比表面积,因而受到广泛关注.但多数材料的尺寸较大(~um),难以抑制光电子与空穴的复合.在本工作中,我们准确地合成了一系列载流子转移效率高、传质和扩散能力强的纳米介孔板钛矿-金红石TiO2混晶.同时,详细研究了介孔TiO2混晶生长的关键因素和机理.以Pt纳米颗粒作为助催化剂,实现了全分解水产氢气和过氧化氢,氢气和过氧化氢的生成速率分别达到9.46±0.56和3.29±1.28μmol mg^-1h^-1.氢气产率是目前报道的TiO2(3.34μmol mg^-1h^-1)的2.8倍.介孔TiO2晶体的纳米尺度和混合晶体结构使其具有优异的光催化效率.本工作为纳米介孔TiO2混合晶体的精准合成,以及光催化全分解水制备高附加值产品提供了新思路.

关 键 词：MESOPOROUS TiO2 mixed CRYSTAL PHOTOCATALYTIC water SPLITTING HYDROGEN HYDROGEN PEROXIDE 

分 类 号：TQ116.2[化学工程—无机化工] O643.36[理学—物理化学] O644.1[理学—化学]