Spatial Heterojunction in Nanostructured TiO2 and Its Cascade Effect for Efficient Photocatalysis

被引：85

作者：

Lu, Yi ^{[1
,2
,3
,4
,5
]}

Liu, Xiao-Long ^{[4
,5
]}

He, Li ^{[1
,2
,3
]}

Zhang, Yue-Xing ^{[8
]}

Hu, Zhi-Yi ^{[9
,10
]}

Tian, Ge ^{[1
,2
,3
]}

Cheng, Xiu ^{[1
,2
,3
]}

Wu, Si-Ming ^{[1
,2
,3
,4
,5
]}

Li, Yuan-Zhou ^{[1
,2
,3
]}

Yang, Xiao-Hang ^{[11
]}

Wang, Li-Ying ^{[12
]}

Liu, Jia-Wen ^{[1
,2
,3
]}

Janiak, Christoph ^{[13
]}

Chang, Gang-Gang ^{[1
,2
,3
]}

Li, Wei-Hua ^{[4
,5
]}

Van Tendeloo, Gustaaf ^{[9
,10
]}

Yang, Xiao-Yu ^{[1
,2
,3
,4
,5
,6
]}

Su, Bao-Lian ^{[1
,2
,3
,7
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China

[2] Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Peoples R China

[3] Wuhan Univ Technol, Sch Chem Chem Engn & Life Sci, Wuhan 430070, Peoples R China

[4] Sun Yat Sen Univ, Southern Marine Sci & Engn Guangdong Lab Zhuhai, Sch Mat, Zhuhai 519000, Peoples R China

[5] Sun Yat Sen Univ, Sch Chem Engn & Technol, Sch Mat, Zhuhai 519000, Peoples R China

[6] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA

[7] Univ Namur, Lab Inorgan Mat Chem, B-5000 Namur, Belgium

[8] Hubei Univ, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Key Lab Synth & Applicat Organ Funct Mol, Coll Chem & Chem Engn,Minist Educ, Wuhan 430062, Peoples R China

[9] Wuhan Univ Technol, Nanostruct Res Ctr, Wuhan 430070, Peoples R China

[10] Univ Antwerp, Electron Microscopy Mat Sci, B-2020 Antwerp, Belgium

[11] Jilin Univ, Coll Chem, Changchun 130023, Peoples R China

[12] Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China

[13] Heinrich Heine Univ Dusseldorf, Inst Anorgan Chem & Strukturchem, D-40204 Dusseldorf, Germany

来源：

NANO LETTERS | 2020年 / 20卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Ti-vacancy; spatial heterojunction; cascade effect; seawater splitting; carbon dioxide reduction; GRAPHENE QUANTUM DOTS; INTERFACIAL CHARGE-TRANSFER; IN-SITU; HYDROGEN-PRODUCTION; NANOPARTICLES; CONDUCTIVITY; NANOCRYSTALS; COMPOSITES; MIMICKING; TITANIA;

D O I：

10.1021/acs.nanolett.9b05121

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A highly efficient photoenergy conversion is strongly dependent on the cumulative cascade efficiency of the photogenerated carriers. Spatial heterojunctions are critical to directed charge transfer and, thus, attractive but still a challenge. Here, a spatially ternary titanium-defected TiO2@carbon quantum dots@reduced graphene oxide (denoted as V-Ti@CQDs@rGO) in one system is shown to demonstrate a cascade effect of charges and significant performances regarding the photocurrent, the apparent quantum yield, and photocatalysis such as H-2 production from water splitting and CO2 reduction. A key aspect in the construction is the technologically irrational junction of Ti-vacancies and nanocarbons for the spatially inside-out heterojunction. The new "spatial heterojunctions" concept, characteristics, mechanism, and extension are proposed at an atomic- nanoscale to clarify the generation of rational heterojunctions as well as the cascade electron transfer.

引用

页码：3122 / 3129

页数：8

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