Giant Enhancement of Internal Electric Field Boosting Bulk Charge Separation for Photocatalysis

Li, Jie; Cai, Lejuan; Shang, Jian Ku; Yu, Ying; Zhang, Lizhi

doi:10.1002/adma.201600301

Cited by 626 publications

(308 citation statements)

References 32 publications

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“…[2] In particular, COH is the most powerful and nonselective oxidant, and it can damage all types of organic/ biomolecules. [4] Recently,pyroelectrically driven COH generation was achieved by synergism of ferroelectric BaTiO 3 and superficial Pd nanoparticles,b ut its efficiency is still low. [4] Recently,pyroelectrically driven COH generation was achieved by synergism of ferroelectric BaTiO 3 and superficial Pd nanoparticles,b ut its efficiency is still low.…”

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confidence: 99%

Macroscopic Polarization Enhancement Promoting Photo‐ and Piezoelectric‐Induced Charge Separation and Molecular Oxygen Activation

et al. 2017

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Efficient photo- and piezoelectric-induced molecular oxygen activation are both achieved by macroscopic polarization enhancement on a noncentrosymmetric piezoelectric semiconductor BiOIO . The replacement of V ions for I in IO polyhedra gives rise to strengthened macroscopic polarization of BiOIO , which facilitates the charge separation in the photocatalytic and piezoelectric catalytic process, and renders largely promoted photo- and piezoelectric induced reactive oxygen species (ROS) evolution, such as superoxide radicals ( O ) and hydroxyl radicals ( OH). This work advances piezoelectricity as a new route to efficient ROS generation, and also discloses macroscopic polarization engineering on improvement of multi-responsive catalysis.

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confidence: 99%

Macroscopic Polarization Enhancement Promoting Photo‐ and Piezoelectric‐Induced Charge Separation and Molecular Oxygen Activation

et al. 2017

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“…[27][28][29][30] To date, various experiments have been reported, some metal ions (e.g., Zn and Fe) or nonmetal (e.g., B and C) doped BiOBr photocatalysts were successfully prepared [31][32][33][34][35] and exhibited good photocatalytic performance, which mainly attributed to several aspects, e.g. impurity energy level introduced into the energy band, internal electric eld tuning and capture traps generated for electrons and holes.…”

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confidence: 99%

Efficient photocatalytic dye degradation over Er-doped BiOBr hollow microspheres wrapped with graphene nanosheets: enhanced solar energy harvesting and charge separation

et al. 2017

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In this work, Er-doped BiOBr hollow microspheres wrapped with graphene nanosheets, which acted as a photocatalyst with excellent photocatalytic activity and stability, have been successfully synthesized through a simple two-step hydrothermal method. The related properties of the as-prepared photocatalyst were analyzed and a possible reaction mechanism was proposed. Incorporating the rareearth element Er into the BiOBr crystal lattice can greatly expand the optical window, maybe owing to the reduced energy band gap by the impurity energy level introduced below the conduction band and indirect utilization of long-wavelength visible light caused by the up-conversion performance. The wrapping with surface graphene nanosheets can efficiently promote charge separation and transmission over the hybrid photocatalyst. The synergistic effect between efficient solar energy harvesting and charge separation gives rise to a remarkable improvement of photocatalytic activity for RhB degradation under simulated sunlight irradiation. In addition, the as-prepared photocatalyst possesses excellent photocatalytic stability, mainly due to the robust coordination interaction between the graphene and the (001) facets of the BiOBr subunits. The rational design of this highly active and stable photocatalyst provides a promising approach for future applications.

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“…[8] Therefore,p olarization of the electric field as an effective strategy is urgently needed to promote bulk charge separation, which would enhance photocatalytic performance (Figure 2. Then, these charge carriers travel from the bulk to the catalytically active sites on the surface of the catalyst to participate in redox reactions.T he charge migration process requires hundreds of picoseconds.However,the charge recombination in bulk only takes several picoseconds,m uch faster than charge transportation.…”

Section: Polarization-promoted Bulk Charge Separationmentioning

confidence: 99%

The Role of Polarization in Photocatalysis

et al. 2019

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Semiconductor photocatalysis as a desirable technology shows great potential in environmental remediation and renewable energy generation, but its efficiency is severely restricted by the rapid recombination of charge carriers in the bulk phase and on the surface of photocatalysts. Polarization has emerged as one of the most effective strategies for addressing the above‐mentioned issues, thus effectively promoting photocatalysis. This review summarizes the recent advances on improvements of photocatalytic activity by polarization‐promoted bulk and surface charge separation. Highlighted is the recent progress in charge separation advanced by different types of polarization, such as macroscopic polarization, piezoelectric polarization, ferroelectric polarization, and surface polarization, and the related mechanisms. Finally, the strategies and challenges for polarization enhancement to further enhance charge separation and photocatalysis are discussed.

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Giant Enhancement of Internal Electric Field Boosting Bulk Charge Separation for Photocatalysis

Cited by 626 publications

References 32 publications

Macroscopic Polarization Enhancement Promoting Photo‐ and Piezoelectric‐Induced Charge Separation and Molecular Oxygen Activation

Macroscopic Polarization Enhancement Promoting Photo‐ and Piezoelectric‐Induced Charge Separation and Molecular Oxygen Activation

Efficient photocatalytic dye degradation over Er-doped BiOBr hollow microspheres wrapped with graphene nanosheets: enhanced solar energy harvesting and charge separation

The Role of Polarization in Photocatalysis

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