Lattice distortion induced internal electric field in TiO2 photoelectrode for efficient charge separation and transfer

Hu, Yuxiang; Pan, Yuanyuan; Wang, Zhiliang; Lin, Tongen; Gao, Yulong; Luo, Bin; Hu, Han; Fan, Fengtao; Liu, Gang; Wang, Luyao

doi:10.1038/s41467-020-15993-4

Cited by 119 publications

(95 citation statements)

References 48 publications

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“…One example is the Li‐inserted TiO 2 photoelectrode, which has been affected by lithium doping, lattice distortion and V O . Yet, the V O was found to have inferior contribution to the performance compared to the lattice distortion 81 . In addition, the long‐term effectiveness of oxygen vacancy should also be paid attention to.…”

Section: How To Justify the Influence Of Oxygen Vacancy On Pecmentioning

confidence: 98%

Role of oxygen vacancy in metal oxide based photoelectrochemical water splitting

Wang

2021

EcoMat

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Photoelectrochemial (PEC) water splitting relies on the optoelectric property of the photoelectrodes. Oxygen vacancy (VO) has attracted increasing attention in tailoring photoelectrodes in the following three aspects: light harvest, charge separation and transfer, and surface reaction kinetics. Even though the VO may increase the recombination as a kind of defects in metal oxide based photoelectrode, a number of recent researches have revealed the beneficial feature of VO in PEC, which is controversial to the former understanding. Thus, a comprehensive analysis about the oxygen vacancy in the metal oxide photoelectrodes will be important for applying VO in achieving high PEC performance. Herein, we contribute a critical review on the role of oxygen vacancy including its formation mechanism, characterization methods, and the influence on the semiconductor and surface catalytic properties. The knowledge will help to clarify the effect of VO in terms of the structure‐performance relationship in the PEC process.

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Section: How To Justify the Influence Of Oxygen Vacancy On Pecmentioning

confidence: 98%

Role of oxygen vacancy in metal oxide based photoelectrochemical water splitting

Wang

2021

EcoMat

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“…There have been numerous studies on the introduction of various metals, including transition metals (Fe, Co, Mn, and Cr), [43][44][45][46][47] main group metals (Sn and Bi), [48][49][50] and rare earth metals (Er and Yb), [51,52] as dopants into the TiO 2 lattice. In general, the doped metals can build donor states below the CB of TiO 2 , leading to the narrowing of bandgap and the absorption of visible light.…”

Section: Metal Dopingmentioning

confidence: 99%

Visible‐Light Responsive TiO₂‐Based Materials for Efficient Solar Energy Utilization

Zhang

et al. 2020

Advanced Energy Materials

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129

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currents, geothermal, biomass, and solar, have been developed as alternatives. Among them, solar energy is the most abundant, inexpensive, nonpolluting, and sustainable. [5][6][7][8] Some semiconductors, so called photocatalysts, which possess the capacity to harvest solar energy to drive catalytic reactions for valuable chemical production, have been designed and fabricated to achieve efficient solar energy utilization. [9][10][11][12][13][14][15][16][17][18][19] Typically, TiO 2 is recognized as one of the most promising candidates due to its chemical stability, nontoxicity, and high resistance to photocorrosion. [20][21][22][23][24][25] In general, TiO 2 possesses three major phases, including anatase, rutile and brookite, and many other minor phases, such as monoclinic TiO 2 (B). All of them have wide bandgaps of 3.0-3.2 eV. Hence, TiO 2 can only absorb ultraviolet light (UV), while the visible light accounting for ≈43% of solar energy cannot be utilized. Furthermore, the rapid recombination of photogenerated electrons and holes severely limits its quantum efficiency. Thus, overall photocatalytic activity of TiO 2 is very limited, especially under visiblelight irradiation. [26][27][28] A complete photocatalytic reaction using TiO 2 -based photocatalysts involves three major steps: i) light absorption and The photocatalytic properties of TiO 2 have aroused a broad range of research interest since 1972 due to its abundance, chemical stability, and easily available nature. To increase its overall activity, in the past few decades, much effort has been devoted to the fabrication of advanced TiO 2 -based photocatalysts with visible-light response and these photocatalysts have shown great potential in the field of solar energy utilization. Here, recent progress in the investigation of visible-light responsive TiO 2 -based materials are reviewed. Notably, the fabrication strategies and corresponding chemical/ physical properties of visible-light responsive TiO 2 -based materials are described in detail, with a focus on bandgap engineering and junction engineering from the perspective of light absorption, charge transfer and separation, and surface reactions. Their applications in solar-fuel production, organic synthesis, bacterial disinfection, pollutant degradation and nitrogen fixation are also discussed. Moreover, the new trends and ongoing challenges in this field are proposed and highlighted.

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“…is an efficacious atomic‐level strategy to strengthen the macroscopic polarization across the photocatalysts, which thus induced enhanced internal electric field (or depolarization field) to promote the bulk charge separation and photocatalytic activity. [ 128–131 ]…”

Section: Atomic‐level Bulk Charge Separation Strategiesmentioning

confidence: 99%

Atomic‐Level Charge Separation Strategies in Semiconductor‐Based Photocatalysts

et al. 2021

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Semiconductor‐based photocatalysis as a productive technology furnishes a prospective solution to environmental and renewable energy issues, but its efficiency greatly relies on the effective bulk and surface separation of photoexcited charge carriers. Exploitation of atomic‐level strategies allows in‐depth understanding on the related mechanisms and enables bottom‐up precise design of photocatalysts, significantly enhancing photocatalytic activity. Herein, the advances on atomic‐level charge separation strategies toward developing robust photocatalysts are highlighted, elucidating the fundamentals of charge separation and transfer processes and advanced probing techniques. The atomic‐level bulk charge separation strategies, embodied by regulation of charge movement pathway and migration dynamic, boil down to shortening the charge diffusion distance to the atomic‐scale, establishing atomic‐level charge transfer channels, and enhancing the charge separation driving force. Meanwhile, regulating the in‐plane surface structure and spatial surface structure are summarized as atomic‐level surface charge separation strategies. Moreover, collaborative strategies for simultaneous manipulation of bulk and surface photocharges are also introduced. Finally, the existing challenges and future prospects for fabrication of state‐of‐the‐art photocatalysts are discussed on the basis of a thorough comprehension of atomic‐level charge separation strategies.

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Lattice distortion induced internal electric field in TiO2 photoelectrode for efficient charge separation and transfer

Cited by 119 publications

References 48 publications

Role of oxygen vacancy in metal oxide based photoelectrochemical water splitting

Role of oxygen vacancy in metal oxide based photoelectrochemical water splitting

Visible‐Light Responsive TiO₂‐Based Materials for Efficient Solar Energy Utilization

Atomic‐Level Charge Separation Strategies in Semiconductor‐Based Photocatalysts

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Lattice distortion induced internal electric field in TiO2 photoelectrode for efficient charge separation and transfer

Cited by 119 publications

References 48 publications

Role of oxygen vacancy in metal oxide based photoelectrochemical water splitting

Role of oxygen vacancy in metal oxide based photoelectrochemical water splitting

Visible‐Light Responsive TiO2‐Based Materials for Efficient Solar Energy Utilization

Atomic‐Level Charge Separation Strategies in Semiconductor‐Based Photocatalysts

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Visible‐Light Responsive TiO₂‐Based Materials for Efficient Solar Energy Utilization