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TiO2 Photocatalysts
Wu Wenbo Tong BingQi CCME2019
Outline Overview Binary metal oxide
Mixed metal oxides Dye sensitization QD sensitization Doping
Ternary or more
Ternary or more Synergistic effect Co-sensitization
range of the TiO2 photoresponse from ultraviolet (UV) to visible region
Summary References
• In the absence of the Fe2O3, most of these
Binary metal oxide
Outline
Overview Binary metal oxide
Mixed metal oxides
Mixed metal oxides
Dye sensitization QD sensitization Doping
• the modified Fe2O3 increases the probability of charge–carrier separation and extends the
Synergistic effect Co-sensitization
Summary References Acknowledgment
Outline
• Overview • Binary metal oxide • Mixed metal oxides • Dye sensitization • QD sensitization • Doping • Ternary or more • Synergistic effect • Co-sensitization • Summary • References • Acknowledgment
Acknowledgment
charges quickly recombine without any
valuable utilization
• Fe2O3 :-4.7 eV, 2.2eV TiO2:-4.21 eV,3.2eV
Shuyun Kuang, Lixia Yang et al, Applied Surfபைடு நூலகம்ce Science, 2009, vol.255: 7385
Outline Overview Binary metal oxide
Mixed metal oxides Dye sensitization QD sensitization Doping
Ternary or more
Synergistic effect Co-sensitization
Summary References Acknowledgment
Overview’ Single component metal oxide
• 0D nanostructures: spherical NPs
• 1D nanostructures: nanorods, nanowires and nanotubes
• Different MO systems: TiO2, ZnO, WO3, Fe2O3……
Jin Zhong Zhang, Materials Research Society, 2019,Vol.36: 48;
Outline
Overview Binary metal oxide
Overview
Mixed metal oxides
Dye sensitization
QD sensitization Weak absorption in the visible spectrum
Doping Ternary or more
smaller bandgaps => size-tunable
Synergistic effect Co-sensitization
absorption
Summary
References
Acknowledgment Very short-lived charge carrier lifetimes
Ternary or more
Synergistic effect
Co-sensitization
Summary
References
Acknowledgment
Fe2O3/TiO2 nanotubes with increasing Fe content : 100mWcm-2; 1 M KOH)
Shuyun Kuang, Lixia Yang et al, Applied Surface Science, 2009, vol.255: 7385
Outline Overview
Dye sensitization
Binary metal oxide Mixed metal oxides
(not mentioned)
Dye sensitization
QD sensitization Doping Ternary or more Synergistic effect
reducing electron–hole recombination
Outline Overview Binary metal oxide Mixed metal oxides Dye sensitization QD sensitization Doping Ternary or more Synergistic effect Co-sensitization Summary References Acknowledgment
Outline
Overview Binary metal oxide
Mixed metal oxides
Mixed metal oxides
Dye sensitization QD sensitization
There is an optimum content of the
Doping
modifying materials.
Wu Wenbo Tong BingQi CCME2019
Outline Overview Binary metal oxide
Mixed metal oxides Dye sensitization QD sensitization Doping
Ternary or more
Ternary or more Synergistic effect Co-sensitization
range of the TiO2 photoresponse from ultraviolet (UV) to visible region
Summary References
• In the absence of the Fe2O3, most of these
Binary metal oxide
Outline
Overview Binary metal oxide
Mixed metal oxides
Mixed metal oxides
Dye sensitization QD sensitization Doping
• the modified Fe2O3 increases the probability of charge–carrier separation and extends the
Synergistic effect Co-sensitization
Summary References Acknowledgment
Outline
• Overview • Binary metal oxide • Mixed metal oxides • Dye sensitization • QD sensitization • Doping • Ternary or more • Synergistic effect • Co-sensitization • Summary • References • Acknowledgment
Acknowledgment
charges quickly recombine without any
valuable utilization
• Fe2O3 :-4.7 eV, 2.2eV TiO2:-4.21 eV,3.2eV
Shuyun Kuang, Lixia Yang et al, Applied Surfபைடு நூலகம்ce Science, 2009, vol.255: 7385
Outline Overview Binary metal oxide
Mixed metal oxides Dye sensitization QD sensitization Doping
Ternary or more
Synergistic effect Co-sensitization
Summary References Acknowledgment
Overview’ Single component metal oxide
• 0D nanostructures: spherical NPs
• 1D nanostructures: nanorods, nanowires and nanotubes
• Different MO systems: TiO2, ZnO, WO3, Fe2O3……
Jin Zhong Zhang, Materials Research Society, 2019,Vol.36: 48;
Outline
Overview Binary metal oxide
Overview
Mixed metal oxides
Dye sensitization
QD sensitization Weak absorption in the visible spectrum
Doping Ternary or more
smaller bandgaps => size-tunable
Synergistic effect Co-sensitization
absorption
Summary
References
Acknowledgment Very short-lived charge carrier lifetimes
Ternary or more
Synergistic effect
Co-sensitization
Summary
References
Acknowledgment
Fe2O3/TiO2 nanotubes with increasing Fe content : 100mWcm-2; 1 M KOH)
Shuyun Kuang, Lixia Yang et al, Applied Surface Science, 2009, vol.255: 7385
Outline Overview
Dye sensitization
Binary metal oxide Mixed metal oxides
(not mentioned)
Dye sensitization
QD sensitization Doping Ternary or more Synergistic effect
reducing electron–hole recombination
Outline Overview Binary metal oxide Mixed metal oxides Dye sensitization QD sensitization Doping Ternary or more Synergistic effect Co-sensitization Summary References Acknowledgment
Outline
Overview Binary metal oxide
Mixed metal oxides
Mixed metal oxides
Dye sensitization QD sensitization
There is an optimum content of the
Doping
modifying materials.