Hydrothermal Synthesis of Single-Crystalline Perovskite PbTiO<sub>3</sub> Nanosheets with Dominant (001) Facets

Deng, Shiqi; Xu, Gang; Bai, Huiwen; Jiang, Shan; Shen, Ge; Han, Gaorong

doi:10.1021/ic501180g

Cited by 26 publications

(11 citation statements)

References 40 publications

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“…The result conforms with the literature. 44,45 The peak around 650 nm-800 nm for Co-doped samples was originated from The agreement between the experimental and theory predicted spectra further confirms the double perovskite structure.…”

Section: Electronic Structuresupporting

confidence: 64%

Double Perovskite Structure Induced by Co Addition to PbTiO₃: Insights from DFT and Experimental Solid-State NMR Spectroscopy

et al. 2019

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The effects of Co addition on the chemical and electronic structure of PbTiO 3 were explored both by theory and through experiment. Cobalt was incorporated to PbTiO 3 during sol gel process. The XRD data of the compounds confirmed the perovskite structure for the pure samples. The XRD lines broadened and showed emerging cubiclike features as the Co incorporation increased. The changes in the XRD pattern were interpreted as double perovskite structure formation. 207 Pb NMR measurements revealed a growing isotropic component in the presence of Co. In line with the experiments, DFT calculated chemical-shift values corroborate isotropic coordination of Pb suggesting the formation of cubic Pb 2 CoTiO 6 domains in the prepared samples. The state-of-the-art hybrid functional first-principles calculations indicate formation of Pb 2 CoTiO 6 with cubic structure and confirms that Co addition can decrease oxygen binding energy significantly. Experimental UV-Vis spectroscopy results indicate that upon addition of Co, the band gap is shifted towards visible wavelengths which was confirmed by the energy bands and absorption spectra calculations. The oxygen binding energies were determined by temperature programmed reduction (TPR) measurements. Upon addition of Co, TPR lines shifted to lower temperatures and new features appeared in the TPR patterns. This shift was interpreted as weakening of oxygen cobalt bond strength. The change in the electronic structure by the alterations of oxygen vacancy formation energy and bond lengths upon Co insertion are determined by DFT calculations.

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Section: Electronic Structuresupporting

confidence: 64%

Double Perovskite Structure Induced by Co Addition to PbTiO₃: Insights from DFT and Experimental Solid-State NMR Spectroscopy

et al. 2019

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“…The PL emission around 450–500 nm can be attributed to the radiative recombination of defective in‐gap states. [ 27 ] Compared to that of pristine PTO sample, PL peak of CN 0.10 /PTO sample was weaker, revealing a type II junction (Figure S3b, Supporting Information) between PTO and CN in which the photogenerated electrons on the conduction band (CB) of PTO was transferred to that of CN, photogenerated holes on the valance band (VB) of CN was transferred to that of PTO. [ 28 ] This type II junction increases the separation efficiency of photogenerated charge carriers, leading to the better PEC performance.…”

Section: Figurementioning

confidence: 99%

Enhanced Photoelectrochemical Performance by Interface Engineering in Ternary g‐C₃N₄/TiO₂/PbTiO₃ Films

Wang

Zheng

Weng

et al. 2020

Adv Materials Inter

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Ferroelectric materials recently rise as promising candidates in solar energy harvesting owing to their unconventional photophysics, such as above-bandgap photovoltage, [6] tunable photovoltaic outputs, and birefractive behaviors. [7] These unique properties stem from the centrosymmetry breaking and spontaneous polarization of ferroelectrics, which produces an internal field that drives the efficient separation of photocarriers. [8] PbTiO 3 (PTO), as a prototypical ferroelectric perovskite oxide, stands out as a potential material for PEC applications due to its robust room temperature ferroelectricity and huge polarization. [9] Also, noble-metal decoration or other semiconductors compositing were used to further improve the PEC performance of PTO. For example, Chao et al. utilized a hydrothermal method to synthesize Au island decorated single-domain PTO nanoplates, and the composite demonstrated an efficient photocatalytic degradation of RhB performance. [10] Lekha et al. engineered a series of PTO/LaCrO3 p-n junction through a two-step combustion process, and found that the optimal photocurrent density was 4.5 times larger than that of pure PTO photoelectrode. [11] Recently, metal-free polymeric semiconductor, graphitelike carbon nitride (g-C 3 N 4 ) has attracted much attention due to its moderate band gap of 2.7 eV and inherent chemical and thermal stability compared to transitional metal oxides and sulfide. [12] However, the high photocarrier recombination rate and poor quantum efficiency has driven the effort to construct various composite structures to alleviate these deficiencies of pure g-C 3 N 4 . [13] Xiao et al. fabricated a Z-scheme 0D g-C 3 N 4 particles/1D TO nanotube arrays heterostructure to promote charge carriers separation and transfer processes, thus improve the PEC water splitting ability. [14] Wang et al. prepared a nanostructured g-C 3 N 4 /BiVO 4 composite films, and the photocurrent density was approximately 15 times as that of BiVO 4 photoelectrode, which was ascribed to the formation of a type II heterostructure between g-C 3 N 4 and BiVO 4 . [15] In this study, we fabricated the polycrystalline PTO film by a sol-gel method, and the g-C 3 N 4 were than decorated on the surface of the PTO film through chemical vapor deposition method to improve the PEC performance. To further improve the PEC performance, a TO buffer layer was inserted between PTO and g-C 3 N 4 , which was widely used as electrons transport layer in solar cells. [16] The optimal photocurrent density of CN/TO/PTO photoelectrode was 4.5 times higher than that Polycrystalline ferroelectric PbTiO 3 (PTO) films deposited on transparent fluorine-doped tin oxide (FTO) glass have been proved to be a photocathode for photoelectrochemical (PEC) water splitting. However, the hitherto reported PEC performances remain inferior to meet the requirements for practical applications. Herein, it is reported that a compact TiO 2 (TO) buffer layer, inserted between PTO and g-C 3 N 4 (CN), improves significantly its PEC performance. The o...

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“…Among those methods, hydrothermal route is an aqueous-based precipitation technique allowing to control over the nucleation and growth of crystals 16 . 18 The substitution of Pb 2+ ions for K + ions induces the exfoliation of TiO 6 octahedral lamellas from the layered K 2 Ti 6 O 13 nanofibers, which finally leads to the lamellar PbTiO 3 species and further crystallization of the PbTiO 3 nanosheets. In our previous works 17 , tetragonal perovskite lead titanate (PZT) nanorods and nanowires were successfully synthesized via hydrothermal route by using polyvinyl alcohol (PVA) as modifiers.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of flower-like LiMnPO₄nanostructures self-assembled with (010) nanosheets and their application in Li-ion batteries

Bao

Wang

et al. 2015

CrystEngComm

Self Cite

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Flower-like LiMnPO4 nanostructures self-assembled with (010) nanosheets were successfully synthesized via a simple hydrothermal method by employing MnSO4 and Li2SO4 as raw materials and EG-H2O mixture as reaction medium solvent. The flower-like LiMnPO4 were characterized by X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM, respectively. The primary LiMnPO4 nanosheets are about 30 nm in thickness and dominated with (010) facets. In order to understand the formation mechanism of the flower-like LiMnPO4 nanostructures, a series of time-dependent experiments were adopted. Based on the experimental results, a possible mechanism was proposed for the formation of LiMnPO4 nanosheets and the assembly of the flower-like nanostructures. Additionally, the electrochemical performances of the flower-like LiMnPO4 nanostructures as cathode materials in Li-ion battery were also investigated by charge-discharge measurements.

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Hydrothermal Synthesis of Single-Crystalline Perovskite PbTiO₃ Nanosheets with Dominant (001) Facets

Cited by 26 publications

References 40 publications

Double Perovskite Structure Induced by Co Addition to PbTiO₃: Insights from DFT and Experimental Solid-State NMR Spectroscopy

Double Perovskite Structure Induced by Co Addition to PbTiO₃: Insights from DFT and Experimental Solid-State NMR Spectroscopy

Enhanced Photoelectrochemical Performance by Interface Engineering in Ternary g‐C₃N₄/TiO₂/PbTiO₃ Films

Hydrothermal synthesis of flower-like LiMnPO₄nanostructures self-assembled with (010) nanosheets and their application in Li-ion batteries

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Hydrothermal Synthesis of Single-Crystalline Perovskite PbTiO3 Nanosheets with Dominant (001) Facets

Cited by 26 publications

References 40 publications

Double Perovskite Structure Induced by Co Addition to PbTiO3: Insights from DFT and Experimental Solid-State NMR Spectroscopy

Double Perovskite Structure Induced by Co Addition to PbTiO3: Insights from DFT and Experimental Solid-State NMR Spectroscopy

Enhanced Photoelectrochemical Performance by Interface Engineering in Ternary g‐C3N4/TiO2/PbTiO3 Films

Hydrothermal synthesis of flower-like LiMnPO4nanostructures self-assembled with (010) nanosheets and their application in Li-ion batteries

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Hydrothermal Synthesis of Single-Crystalline Perovskite PbTiO₃ Nanosheets with Dominant (001) Facets

Double Perovskite Structure Induced by Co Addition to PbTiO₃: Insights from DFT and Experimental Solid-State NMR Spectroscopy

Double Perovskite Structure Induced by Co Addition to PbTiO₃: Insights from DFT and Experimental Solid-State NMR Spectroscopy

Enhanced Photoelectrochemical Performance by Interface Engineering in Ternary g‐C₃N₄/TiO₂/PbTiO₃ Films

Hydrothermal synthesis of flower-like LiMnPO₄nanostructures self-assembled with (010) nanosheets and their application in Li-ion batteries