Favorable Energy Band Alignment of TiO_2 Anatase/Rutile Heterophase Homojunctions Yields Photocatalytic Hydrogen Evolution with Quantum Efficiency Exceeding 45.6

Ruan Xiaowen; Cui Xiaoqiang; Cui YiFan XiaofengLi ZhiyunXie TengfengBa KaikaiJia GuangriZhang HaiyanZhang LeiZhang WeiZhao XiaoLeng JingJin ShengyeSingh David J.Zheng Weitao

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Favorable Energy Band Alignment of TiO_2 Anatase/Rutile Heterophase Homojunctions Yields Photocatalytic Hydrogen Evolution with Quantum Efficiency Exceeding 45.6

机译：Favorable Energy Band Alignment of TiO_2 Anatase/Rutile Heterophase Homojunctions Yields Photocatalytic Hydrogen Evolution with Quantum Efficiency Exceeding 45.6

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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.

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《Advanced energy materials》 |2022年第16期|2200298.1-2200298.9|共9页
作者
Ruan Xiaowen; Cui Xiaoqiang; Cui YiFan XiaofengLi ZhiyunXie TengfengBa KaikaiJia GuangriZhang HaiyanZhang LeiZhang WeiZhao XiaoLeng JingJin ShengyeSingh David J.Zheng Weitao;
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Jilin Univ, Electron Microscopy Ctr, Sch Mat Sci & Engn, State Key Lab Automot Simulat & Control,Key Lab A, Changchun 130012, Peoples R China;

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

Jilin Univ, Coll Chem, 2699 Qianjin St, Changchun 130012, Peoples R ChinaChinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R ChinaJilin Univ, Electron Microscopy Ctr, Sch Mat Sci & Engn, State Key Lab Automot Simulat & Control,Key Lab A, Changchun 130012, Peoples R China|Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA|Univ Missouri, Dept Chem, Columbia, MO 65211 USA;

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apparent quantum efficiency; energy bands; heterophase homojunction; hydrogen evolution; photocatalysts;

Favorable Energy Band Alignment of TiO_2 Anatase/Rutile Heterophase Homojunctions Yields Photocatalytic Hydrogen Evolution with Quantum Efficiency Exceeding 45.6

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