Oxygen vacancies and interfaces enhancing photocatalytic hydrogen production in mesoporous CNT/TiO2 hybrids

被引：118

作者：

Moya, Alicia ^{[1
]}

Cherevan, Alexey ^{[2
]}

Marchesan, Silvia ^{[3
]}

Gebhardt, Paul ^{[2
]}

Prato, Maurizio ^{[3
]}

Eder, Dominik ^{[2
]}

Vilatela, Juan J. ^{[1
]}

机构：

[1] IMDEA Mat Inst, Madrid 28906, Spain

[2] Univ Munster, Inst Phys Chem, D-48148 Munster, Germany

[3] Univ Trieste, Dipartimento Sci Chim & Farmaceut, Unit Trieste, Ctr Excellence Nanostruct Mat INSTM, I-34127 Trieste, Italy

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2015年 / 179卷

关键词：

Hybrid; CNT/TiO2; Interface; Oxygen vacancies; Hydrogen production; TIO2; NANOFIBERS; ANATASE; RUTILE; GRAPHENE; NANOCOMPOSITES; TRANSFORMATION; NANOPARTICLES; PERFORMANCE; DEPENDENCE; NANOWIRE;

D O I：

10.1016/j.apcatb.2015.05.052

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We demonstrate a unique route towards hierarchical assemblies of mesoporous TiO2 and CNT/TiO2 photocatalysts by a combination of electrospinning and sol-gel methods. The resulting materials exhibit a mesoporous network of highly crystalline, well-connected inorganic nanocrystals with an order of magnitude higher photocatalytic activity than individualised TiO2 nanoparticles. The in-situ combination of small amounts of MWCNTs with TiO2 to form an electrospun CNT/TiO2 hybrid further enhanced the oxide photoactivity considerably, reaching hydrogen evolution rates of 1218 mu mol/h in water splitting in the presence of sacrificial reagents under UV irradiation. We also discuss the effect of oxygen vacancies on the oxide crystallisation and phase transformation. These vacancies lead to inter-bandgap states and a lower flat band potential that facilitates the photocatalytic process. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：574 / 582

页数：9

共 49 条

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