Interfacial Chemical-Bond-Modulated Charge Transfer of Heterostructures for Improving Photocatalytic Performance

被引:54
作者
Jiang, Denghui [3 ]
Liu, Ziran [4 ]
Fu, Liangjie [3 ,5 ]
Yang, Huaming [1 ,2 ]
机构
[1] Cent South Univ, Ctr Mineral Mat, Sch Minerals Proc & Bioengn, Hunan Int Joint Lab Mineral Mat, Changsha 410083, Peoples R China
[2] Cent South Univ, Key Lab Clay Mineral Funct Mat China Bldg Mat Ind, Changsha 410083, Peoples R China
[3] Cent South Univ, Ctr Mineral Mat, Sch Minerals Proc & Bioengn, Changsha 410083, Peoples R China
[4] Hunan Normal Univ, Minist Educ, Dept Phys, Key Lab Low Dimens Struct & Quantum Manipulat, Changsha 410081, Peoples R China
[5] Cent South Univ, Hunan Int Joint Lab Mineral Mat, Changsha 410083, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
nanoclay; P25; photocatalytic ability; energy band bending; charge transfer channel; HYDROGEN-PRODUCTION; CRYSTAL-STRUCTURE; DYE POLLUTANTS; CU2O CUBES; TIO2; SURFACE; COMPOSITE; DEGRADATION; NANOCOMPOSITES; OXIDATION;
D O I
10.1021/acsami.9b17183
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Interface engineering of heterostructured photocatalysts plays a very important role in the transfer and separation process of interfacial charge carriers, but how to regulate the transfer and separation of photogenerated charge carriers still is a huge challenge at the nanometric interface of heterostructures (HCs). Herein, we demonstrate that interfacial chemical bonds can effectively modulate photogenerated charge transfer in nanoclay-based HCs constructed by natural Kaolinite (Kaol) nanosheets and P25-TiO2. Experimental results and density functional theory (DFT) calculations confirm that stable Al-O-Ti bonds form at the interfaces by interactions of the Al-OH groups of Kaol and (101) surfaces of anatase TiO2. The Al-O-Ti bond strengthens the energy band bending of the space charge region near the interfacial bond and thus provides a fast transfer channel for interfacial photogenerated charge, resulting in the boosted charge transfer and separation ability of Kaol/P25 HCs. The findings reported here provide a deeper insight into modulating interfacial charge transfer by chemical bonds and shed new light on interface engineering of efficient heterostructured photocatalysts for environmental applications.
引用
收藏
页码:9872 / 9880
页数:9
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