Favorable Energy Band Alignment of TiO2 Anatase/Rutile Heterophase Homojunctions Yields Photocatalytic Hydrogen Evolution with Quantum Efficiency Exceeding 45.6%

被引：241

作者：

Ruan, Xiaowen ^{[1
]}

Cui, Xiaoqiang ^{[1
]}

Cui, Yi ^{[2
]}

Fan, Xiaofeng ^{[1
]}

Li, Zhiyun ^{[2
]}

Xie, Tengfeng ^{[3
]}

Ba, Kaikai ^{[3
]}

Jia, Guangri ^{[1
]}

Zhang, Haiyan ^{[1
]}

Zhang, Lei ^{[3
]}

Zhang, Wei ^{[1
]}

Zhao, Xiao ^{[1
]}

Leng, Jing ^{[4
]}

Jin, Shengye ^{[4
]}

Singh, David J. ^{[1
,5
,6
]}

Zheng, Weitao ^{[1
]}

机构：

[1] Jilin Univ, Electron Microscopy Ctr, Sch Mat Sci & Engn, State Key Lab Automot Simulat & Control,Key Lab A, Changchun 130012, Peoples R China

[2] Chinese Acad Sci, Suzhou Inst Nanotech & Nanobion, Vacuum Interconnected Nanotech Workstn, Suzhou 215123, Peoples R China

[3] Jilin Univ, Coll Chem, 2699 Qianjin St, Changchun 130012, Peoples R China

[4] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China

[5] Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA

[6] Univ Missouri, Dept Chem, Columbia, MO 65211 USA

来源：

ADVANCED ENERGY MATERIALS | 2022年 / 12卷 / 16期

基金：

中国国家自然科学基金;

关键词：

apparent quantum efficiency; energy bands; heterophase homojunction; hydrogen evolution; photocatalysts; HOLLOW SPHERES; DOPED TIO2; WATER; HETEROJUNCTION; SEPARATION; CONVERSION; NANOSHEETS;

D O I：

10.1002/aenm.202200298

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：

Developing the technology for high yielding photocatalytic hydrogen evolution reactions is an important challenge. Development and optimization of photocatalytic junctions is a likely route for achieving this if heterojunctions with suitable band alignments can be achieved in sufficiently high-density form. Here, a novel anatase-TiO2/H-rutile-TiO2 heterophase homojunction system with near optimum energy band alignment is reported. The resulting as-prepared catalyst exhibits an excellent photocatalytic hydrogen evolution rate of 29.63 mmol g(-1) h(-1) under UV-vis light irradiation and an outstanding apparent quantum efficiency of 45.6% at 365 nm. The significant improvement is ascribed to near perfect lattice matching in combination with the rapid separation and transfer of photogenerated carriers in anatase-TiO2/H-rutile-TiO2 heterophase homojunctions. In situ X-ray photoelectron spectroscopy, electron spin resonance spin-trapping tests, femtosecond transient absorption spectroscopy, steady-state surface photovoltage spectroscopy, and transient-state surface photovoltage with additional ex situ characterizations and theoretical calculations show that the mechanism is enhanced transfer of photogenerated carriers in the anatase-TiO2/H-rutile-TiO2 catalyst. This work provides a pathway for enhancing photocatalytic performance through optimization of heterojunctions.

引用

页数：9

共 79 条

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