Journal ArticleDOI
Insights into the Effects of Surface/Bulk Defects on Photocatalytic Hydrogen Evolution over TiO2 with Exposed {001} Facets
Hao Zhang,Jinmeng Cai,Yating Wang,Moqing Wu,Ming Meng,Ye Tian,Xingang Li,Jing Zhang,Lirong Zheng,Zheng Jiang,Jinlong Gong,Jinlong Gong +11 more
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In this paper, the authors describe the effects of defect distribution on energy band structure and subsequent photocatalytic activity over TiO2 with exposed {001} facets as the model catalyst.Abstract:
This paper describes the effects of defect distribution on energy band structure and the subsequent photocatalytic activity over TiO2 with exposed {001} facets as the model catalyst. Our results show that only surface oxygen vacancies (Vo’s) and Ti3+ centers in TiO2 can be induced by hydrogenation treatment, whereas the generation of bulk Vo’s and Ti3+ species depends on the thermal treatment in nitrogen. Both the surface and bulk defects in TiO2 can promote the separation of electron-hole pairs, enhance the light absorption, and increase the donor density. The presence of surface and bulk defects in TiO2 can not change the valence band maximum, but determine the conduction band minimum. Surface defects in TiO2 induce a tail of conduction band located above the H+/H2 redox potential, which benefits the photocatalytic performance. However, bulk defects in TiO2 generate a band tail below the H+/H2 potential, which inhibits hydrogen production. Thus, the change of band gap structure by defects is the major factor to determine the photocatalytic activity of TiO2 for hydrogen evolution. It is a new insight into the rational design and controllable synthesis of defect-engineered materials for various catalytic processes.read more
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Journal ArticleDOI
Defect engineering in photocatalytic materials
TL;DR: In this paper, the state-of-the-art progress on defect-engineered photocatalytic materials is reviewed and the future opportunities and challenges regarding defect engineering in photocatalysis are highlighted.
Journal ArticleDOI
Engineering the Atomic Interface with Single Platinum Atoms for Enhanced Photocatalytic Hydrogen Production.
Yuanjun Chen,Shufang Ji,Wenming Sun,Yongpeng Lei,Qichen Wang,Ang Li,Wenxing Chen,Gang Zhou,Zedong Zhang,Yu Wang,Lirong Zheng,Qinghua Zhang,Lin Gu,Xiaodong Han,Dingsheng Wang,Yadong Li +15 more
TL;DR: Experimental results and density functional theory calculations demonstrate that Pt-O-Ti 3+ atomic interface effectively facilitates photogenerated electrons to transfer from Ti 3+ defective sites to single Pt atoms, thereby enhancing the separation of electron-hole pairs.
Journal ArticleDOI
Hydrogenated Blue Titania for Efficient Solar to Chemical Conversions: Preparation, Characterization, and Reaction Mechanism of CO2 Reduction
Guoheng Yin,Xieyi Huang,Tian-yuan Chen,Wei Zhao,Qingyuan Bi,Jing Xu,Yi-Fan Han,Fuqiang Huang,Fuqiang Huang +8 more
TL;DR: In this article, a facile low-temperature solvothermal method by using Li-dissolved ethanediamine to prepare uniform hydrogenated blue H-TiO2-x with wide spectrum response was reported.
Journal ArticleDOI
Co3O4 quantum dots/TiO2 nanobelt hybrids for highly efficient photocatalytic overall water splitting
TL;DR: In this article, the Co3O4 quantum dots (QDs)/TiO2 nanobelts (NBs) hybrid was constructed via a facile hydrothermal method for simultaneous H2 and O2 productions from pure water, with high evolution rates of 41.8 and 22.0
Journal ArticleDOI
Structure-Activity Relationship of Defective Metal-Based Photocatalysts for Water Splitting: Experimental and Theoretical Perspectives.
TL;DR: This work comprehensively reviews point defective metal‐based photocatalysts for water splitting, focusing on understanding the defects' disorder effect on optical adsorption, charge separation and migration, and surface reaction.
References
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Journal ArticleDOI
Hydrogenation of TiO2 nanosheets with exposed {001} facets for enhanced photocatalytc activity
TL;DR: In this article, a high reactive anatase TiO2 nanosheets were maintained by the formation of Ti-H bonds, and a large number of Ti3+ ions and oxygen vacancies were produced by hydrogenation, resulting in improved light absorption and enhanced photocatalytic activity.
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Understanding the fast lithium storage performance of hydrogenated TiO2 nanoparticles
TL;DR: In this paper, the authors reported on the fast lithium storage performance of hydrogenated anatase TiO2 nanoparticles (H-TiO2) prepared by a H2 plasma treatment.
Journal ArticleDOI
H2 spillover enhanced hydrogenation capability of TiO2 used for photocatalytic splitting of water: a traditional phenomenon for new applications
TL;DR: The as-synthesized Pt/TiO2 exhibits remarkably improved photocatalytic activity for water splitting and the hydrogen spillover from Pt to TiO2 accounts well for the greatly enhanced hydrogenation capability.
Journal ArticleDOI
Pd-catalyzed instant hydrogenation of TiO2 with enhanced photocatalytic performance
TL;DR: In this paper, the authors proposed a Pd-catalyzed hydrogenation strategy based on the discovered fact that H2 could spontaneously dissociate on the Pd surface to generate highly active atomic hydrogen species [H], which would diffuse into and interact with the TiO2 lattice to generate durable point defects (Ti3+, oxygen vacancies) and even surface disorder.
Journal ArticleDOI
Reduced TiO2 rutile nanorods with well-defined facets and their visible-light photocatalytic activity
TL;DR: Stable reduced TiO2 rutile nanorods with well-defined facets were prepared by a solvothermal route in the presence of Zn powder and results in a narrow band gap and visible-light photocatalytic activity.
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