构建高结晶TiO_(2)@无定形TiO_(2)同质核壳结构及光催化析氢性能应用  

Construction of high crystalline TiO_(2)@amorphous TiO_(2) homogeneous core-shell structure and application of photocatalytic hydrogen evolution performance

作　　者：王洪丽 郭昌梁 李富祥 蒋保江[1] WANG Hong-Li;GUO Chang-Liang;LI Fu-Xiang;JIANG Bao-Jiang(School of Chemistry and Material Science,Heilongjiang University,Harbin 150080,China)

机构地区：[1]黑龙江大学化学化工与材料学院,哈尔滨150080

出　　处：《黑龙江大学工程学报》2021年第1期27-30,41,共5页Journal of Engineering of Heilongjiang University

基　　金：国家自然科学基金项目(21771061)。

摘　　要：目前对于TiO_(2)的研究主要集中在锐钛矿和金红石相上,对于非晶相TiO_(2)和不同结晶度的混合TiO_(2)的复合结构研究较少。因此,以NH 2-MIL-125(Ti-MOF)衍生获得的高结晶TiO_(2)为前驱体模板,钛酸四丁酯在其表面原位水解形成一层无定形TiO_(2)纳米片,得到高结晶TiO_(2)@无定形TiO_(2)同质核壳结构(简写为C-TiO_(2)@A-TiO_(2)),将其应用于光催化分解水制氢。合成的C-TiO_(2)@A-TiO_(2)具有较好的析氢效率(11.43 mmol·h^(-1)·g^(-1)),析氢速率的提高可以归因于其较大的比表面积,同时同质核壳界面会促进光生载流子的迁移和分离,抑制电子-空穴对的复合。At present,the research on TiO_(2) is mainly focused on anatase and rutile,but there are few studies on the composite structure of amorphous TiO_(2) and TiO_(2) with different crystallinity.Therefore,use the highly crystalline TiO_(2) derived from NH 2-MIL-125(Ti-MOF)as the precursor template,and tetrabutyl titanate is hydrolyzed on its surface to form a layer of amorphous TiO_(2) nanosheet,resulting in a highly crystalline TiO_(2)/amorphous TiO_(2) core-shell structure(abbreviated as C-TiO_(2)@A-TiO_(2)),which is applied to photocatalytic decomposition of water to produce hydrogen.The synthesized C-TiO_(2)@A-TiO_(2) has good hydrogen evolution efficiency(11.43 mmol·h^(-1)·g^(-1)),and the increase of hydrogen evolution rate can be attributed to its large specific surface area.At the same time,the homogenous core-shell interface can promote the migration and separation of photo-generated carriers and inhibit the recombination of electron-hole pairs.

关 键 词：金属有机框架 无定形TiO_(2) 核壳结构 光催化析氢 

分 类 号：O643.32[理学—物理化学]