Tuning Stark effect by defect engineering on black titanium dioxide mesoporous spheres for enhanced hydrogen evolution

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外文摘要：Defects can strongly affect the lattice,strain,and electronic structures of nanomaterials photocatalysts,like a double-edged sword of both positive significance and negative influence on photocatalytic per-formances.To date,most studies into defects only partially elucidated their beneficial or detrimental roles in photocatalysis.However,a quantitative understanding of the photocatalytic performances modu-lated by defect concentration still needs to be discovered.Here,a series of TiO2-X mesoporous spheres(MS)with different oxygen vacancy concentrations for photocatalytic applications were prepared by high-temperature chemical reduction.The link between oxygen vacancy concentration and photocatalytic per-formance was successfully established.The localization of carriers dominated by the Stark effect is first enhanced and then weakened with increasing oxygen vacancy concentration,which is a crucial factor in explaining the double-edged sword role of defect concentration in photocatalysis.As the reduction tem-perature rises to 300 ℃,carrier localization dominated by the quantum-confined Stark effect maximizes the separation ability of photo generated electron hole pairs,thus exhibiting the best catalytic perfor-mance for photocatalytic hydrogen production and the degradation of organic pollutants,as demonstrated by a hydrogen evolution rate of 523.7 μmol g-1 h-1 and a ninefold higher RhB photodegradation rate compared to TiO2 MS.The work offers excellent flexibility for precisely constructing high-performance photocatalysts by understanding vacancy engineering.

外文关键词：

PhotocatalysisDefectCarrier localizationTiO2-XStark effect

作者：

Bingke Zhang、Dongbo Wang、Jiamu Cao、Wen He、Gang Liu、Donghao Liu、Chenchen Zhao、Jingwen Pan、Sihang Liu、Weifeng Zhang、Xuan Fang、Liancheng Zhao、Jinzhong Wang

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作者单位：

School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China

School of Astronautics,Harbin Institute of Technology,Harbin 150001,China

Center for High Pressure Science and Technology Advanced Research,Shanghai 201203,China

Qingdao University of Science and Technology,Qingdao 266061,China

State Key Laboratory of High Power Semiconductor Lasers,School of Physics,Changchun University of Science and Technology,Changchun 130022,China

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出版年：

2024

DOI：

10.1016/j.cclet.2024.110254