Self‐Templated Synthesis of Single‐Crystal and Single‐Domain Ferroelectric Nanoplates

Chao, Chunying; Ren, Zhaohui; Zhu, Yihan; Xiao, Zhen; Liu, Zhenya; Xu, Gang; Mai, Jiangquan; Li, Xiang; Shen, Ge; Han, Gaorong

doi:10.1002/anie.201204792

Cited by 82 publications

(48 citation statements)

References 41 publications

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“…Preparation of PbTiO 3 Single Crystals : Single‐domain PbTiO 3 nanoplates were prepared according to the reported synthesis method . 0.2396 g anatase TiO 2 , 1.2421 g Pb(NO 3 ) 2 , and 10.08 g potassium hydroxide (KOH) were mixed together with 30 mL distilled water.…”

Section: Methodsmentioning

confidence: 99%

“…This property implies that photogenerated electrons can drift to positive polarized surfaces and photogenerated holes can drift to negative polarized surfaces . Recently, PbTiO 3 (PTO) nanoparticles with naturally formed single ferroelectric domain were synthesized chemically . Without polarization by an external electric field, PTO particles are stable in single‐domain form either under atmosphere or in liquid .…”

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confidence: 99%

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Internal‐Field‐Enhanced Charge Separation in a Single‐Domain Ferroelectric PbTiO₃ Photocatalyst

et al. 2020

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Ferroelectric materials with spontaneous polarization‐induced internal electric fields have drawn increasing attention in solar fuel production due to the intrinsic polarized structure. However, the origination of charge separation in these materials at the nano/microlevel is ambiguous owing to the complexity of the multielectric fields. Besides, the observed charge separation ability is far from theoretical expectation. Herein, by spatially resolved surface photovoltage spectroscopy, it is clearly demonstrated that the depolarization field in single‐domain ferroelectric PbTiO3 (PTO) nanoplates is the main driving force for charge separation and it can effectively drive photogenerated electrons and holes to the positive and negative polarization facets, respectively. Moreover, the charge separation ability of PTO nanoplates increases with increasing particle size along the polarization direction, due to the increasing potential difference between the opposite polarization facets. Furthermore, this driving force for charge separation directly contributes to the enhancement of the photocatalytic hydrogen evolution reaction activity in ferroelectrics. Finally, it is proved that the screening field compensates part of the depolarization field and can be diminished by adding a dielectric layer on the ferroelectric surface. These findings demonstrate the importance of increasing the depolarization field and decreasing the screening field for efficient charge separation in ferroelectric semiconductor photocatalysts.

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Section: Methodsmentioning

confidence: 99%

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confidence: 99%

Internal‐Field‐Enhanced Charge Separation in a Single‐Domain Ferroelectric PbTiO₃ Photocatalyst

et al. 2020

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“…Here,wereport the application of spatially resolved surface photovoltage spectroscopy (SRSPS) to obtain direct evidence of highly anisotropic photogenerated charge separation on different facets of as ingle BiVO 4 photocatalyst. [5,[17][18][19][20] Figure 2a,b show the topology and KPFM images of as ingle BV01 crystal. Figure 1a,b show SEM images of the single BiVO 4 crystal growth on fluorine-doped tin oxide (FTO) substrates synthesized with different preferential ramp rates of 2.25 and 1.50 Kmin À1 as described in Figure S1 in the Supporting Information).…”

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Direct Imaging of Highly Anisotropic Photogenerated Charge Separations on Different Facets of a Single BiVO₄ Photocatalyst

et al. 2015

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Spatially resolved surface photovoltage spectroscopy (SRSPS) was employed to obtain direct evidence for highly anisotropic photogenerated charge separation on different facets of a single BiVO4 photocatalyst. Through the controlled synthesis of a single crystal with preferentially exposed {010} facets, highly anisotropic photogenerated hole transfer to the {011} facet of single BiVO4 crystals was observed. The surface photovoltage signal intensity on the {011} facet was 70 times stronger than that on the {010} facets. The influence of the built-in electric field in the space charge region of different facets on the anisotropic photoinduced charge transfer in a single semiconductor crystal is revealed.

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“…Among them, PbTiO 3 nanoplates, which are called PTO nanoplates throughout this article, were determinedt oh ave as ingle-domains tructure. [11] Based on this particularf eature, here, we employed the nanoplates as substrates to photochemically deposit silver oxide nanoparticles, which selectively exist on the positive polar surfaceo ft he ferroelectric nanoplate. The mechanism of the selectived eposition of silver oxide nanoparticles is discussed.…”

Section: Introductionmentioning

confidence: 99%

Selective Deposition of Silver Oxide on Single‐Domain Ferroelectric Nanoplates and Their Efficient Visible‐Light Photoactivity

Chen

Ren

Gong

et al. 2016

Chemistry A European J

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In this work, single-crystal and single-domain PbTiO3 nanoplates are employed as substrates to prepare Ag2 O/PbTiO3 composite materials through a photodeposition method. It is revealed that silver oxide nanocrystals with an average size of 63 nm are selectively deposited on the positive polar surface of the ferroelectric substrate. The possible mechanism leading to the formation of silver oxide is that silver ions are first reduced to silver and then oxidized by oxygen generation. The composite shows an efficient photodegradation performance towards rhodamine B (RhB) and methyl orange (MO) under visible-light irradiation. Such highly efficient photoactivity can be attributed to the ferroelectric polarization effect of the substrate, which promotes the separation of photogenerated electrons and holes at the interface.

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Self‐Templated Synthesis of Single‐Crystal and Single‐Domain Ferroelectric Nanoplates

Cited by 82 publications

References 41 publications

Internal‐Field‐Enhanced Charge Separation in a Single‐Domain Ferroelectric PbTiO₃ Photocatalyst

Internal‐Field‐Enhanced Charge Separation in a Single‐Domain Ferroelectric PbTiO₃ Photocatalyst

Direct Imaging of Highly Anisotropic Photogenerated Charge Separations on Different Facets of a Single BiVO₄ Photocatalyst

Selective Deposition of Silver Oxide on Single‐Domain Ferroelectric Nanoplates and Their Efficient Visible‐Light Photoactivity

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Self‐Templated Synthesis of Single‐Crystal and Single‐Domain Ferroelectric Nanoplates

Cited by 82 publications

References 41 publications

Internal‐Field‐Enhanced Charge Separation in a Single‐Domain Ferroelectric PbTiO3 Photocatalyst

Internal‐Field‐Enhanced Charge Separation in a Single‐Domain Ferroelectric PbTiO3 Photocatalyst

Direct Imaging of Highly Anisotropic Photogenerated Charge Separations on Different Facets of a Single BiVO4 Photocatalyst

Selective Deposition of Silver Oxide on Single‐Domain Ferroelectric Nanoplates and Their Efficient Visible‐Light Photoactivity

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Internal‐Field‐Enhanced Charge Separation in a Single‐Domain Ferroelectric PbTiO₃ Photocatalyst

Internal‐Field‐Enhanced Charge Separation in a Single‐Domain Ferroelectric PbTiO₃ Photocatalyst

Direct Imaging of Highly Anisotropic Photogenerated Charge Separations on Different Facets of a Single BiVO₄ Photocatalyst