JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zhao Wang,Wenyue Zhao,Ze Li,Yazhou Peng,Chang Gao,Lei Shi,Wenjing Hua,Weidong Fei,Yu Zhao
The search for multiferroic materials with ferroelectric and ferromagnetic properties at room temperature continues to be driven by the prospect of new devices. In this paper, Ba 2+ -Ti 4+ co-doped Y 1- x (Ba 0.5 Ti 0.5 ) x FeO 3 were prepared by a traditional solid-state reaction method. The ferroelectricity and ferromagnetism of the co-doped ceramics have been enhanced simultaneously with the maximum polarization of 0.48 μC/cm 2 and the maximum magnetization of 3.25 emu/g, the switched charge density (0.26 μC/cm 2 ) measured by PUND tests indicating the intrinsic and switchable remanent polarization. The increase of Fe 2+ content (increased to 28 % with the increase of doping content) caused by Ba 2+ -Ti 4+ co-doping destroys the antiferromagnetic ground state, and the doping strategy enlarges the tilt angle of oxygen octahedron from 144.93° to 148.63°. The magnetic domain switches caused by the external electric field were directly observed by magnetic force microscopy, indicating the modulation of magnetic domain by polarization at room temperature. This work may provide useful information for the structural design and performance improvement of multiferroic materials.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Shuangjun Li,Xiangping Xiao,Luyang Zuo,Rui Li,Lijun Liu,Huitao Fan,Bo Li,Liya Wang
Designing semiconductor photocatalysts with unique structures can improve the transfer efficiency of solar energy to hydrogen (H 2 ). In this study, a dual modification method of element doping and morphological control was used. The Mn-doped hollow octahedron ZnIn 2 S 4 (ZHO-Mn) was synthesized by a simple one-pot solvothermal method using the octahedral Mn-based metal–organic framework (Mn-MOF) as a template. Experiments and theoretical calculations show that the ZHO-Mn has additional active sites, strong light absorption ability and good photoelectric performance. The H 2 production performance of optimized ZHO-Mn10 was the best (11.9 mmol h −1 g −1 ), which was 7.4 times that of monomer ZnIn 2 S 4 (1.6 mmol h −1 g −1 ). This study provides a new one-step method for the dual control of doping and morphology of ZnIn 2 S 4 photocatalyst
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Qian Liu,Changdi Wang,Hao Wang,Lu Li,Xingrong Zhang,Ruiyang Zhao,Jishu Han,Lei Wang
Hydrogen energy produced through photocatalytic water splitting is widely recognized as a viable solution to the depletion of non-renewable energy resources and ecological contamination concerns. This work designed and synthesized the MOF-derived hollow octahedral Co x P/MOF-801 p-n heterojunction photocatalyst . According to the result of hydrogen production test, the hydrogen production amount of Co x P/MOF-801-2 could reach 25.31 mmol g −1 under light irradiation for 5 h. The hollow octahedral structure and p-n heterojunction of the photocatalyst helped to enhance the light trapping ability and promote carrier transfer, resulting in improved performance of photocatalytic hydrogen production. To sum up, the design of hollow octahedral Co x P/MOF-801 photocatalyst effectively improved the photocatalytic hydrogen production performance.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2024
·
IF 6.8
Liu Haibing,Qiu Yanbin,Gan Wenxiu,Zhuang Guoxin,Chen Fei-Fei,Yang Chengkai,Yu Yan
Regulating charge transfer and reaction pathways are effective strategies for boosting photocatalytic CO 2 reduction. Herein, Co 3 O 4 /ZrO 2 mesoporous octahedrons are synthesized through facile pyrolysis of UIO-66@ZIF-67 core/shell octahedrons. The as-obtained Co 3 O 4 /ZrO 2 mesoporous octahedrons are assembled by highly dispersive and small-sized nanoparticles, with 13 nm average particle size and 5.8 nm pore width, leading to a high specific surface area of 43.11 m 2 g −1 . Benefiting from active-site engineering, the charge-transfer kinetics and CO 2 adsorption are successfully enhanced. In addition, density functional theory calculations reveal that ZrO 2 tailors the reaction pathway of CO 2 reduction by promoting CO 2 activation to *CO 2 and intermediate formation (*COOH and *CO), as well as decreasing the energy barrier of the rate-limiting step (*CO→CO). Thus, the Co 3 O 4 /ZrO 2 mesoporous octahedrons afford a turnover frequency of 28.82 h −1 , 16.95-fold larger than pure Co 3 O 4 .
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 16
·9702-9711
·
IF 4.22
Yang Yongmei,Gao Xinna,Yang Sijun,Shen Yuhua,Xie Anjian
Abstract Fabricate surface-enhanced Raman scattering (SERS) substrate with low cost and high performance through simple method is a challenge and worthy of work. Herein, an excellent Cu 2 O SERS substrate with porous octahedron structure was synthesized by brief calcining Cu-MOFs in Ar, air and H 2 /Ar gas environment at 350 °C successively. The as-obtained octahedral Cu 2 O was utilized as SERS substrate to measure dye molecules and organic pollutants, which exhibited splendid sensitivity for the detection of methylene blue and 4-mercaptopyridine (4-MPY) with the ultralow limit of 5 × 10 –9 M and 5 × 10 –10 M, respectively. The maximum relative standard deviation for detection of 4-MPY is as low as 12.3%, which is less than limiting step in quantitative SERS (15.0%). The above excellent results are due to outstanding synergistic effect of electromagnetic enhancement of oxygen vacancy on the Cu 2 O surface and chemical enhancement of the Cu–S bonds formation. The fabricated Cu 2 O possesses superior sensitivity, selectivity and reproducibility for SERS detection of probe molecules with sulfhydryl groups and may be a prospect candidate in the practical application. Graphical Abstract
An excellent Cu 2 O SERS substrate with porous octahedron structure was synthesized by simple calcining Cu-MOFs in Ar, air and H 2 /Ar gas environment at 350 °C successively. The as-prepared Cu 2 O play significant roles in the enhancement of SERS signals for rich-thiol detection due to outstanding synergistic effect of electromagnetic enhancement of oxygen vacancy on the Cu 2 O surface and chemical enhancement of the Cu-S bonds formation. The detection limit of 4-Mercaptopyridine (4-MPY) can be as low as 5×10 –10 M. The porous octahedral Cu 2 O will have potential applications in SERS detection as the substrate.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 10
·期 2
·638-650
·
IF 7.779
Siyuan Li,Chenyu Zhang,Qi Zhu,Ji-Guang Li
Zero-phonon line (ZPL) emission of Mn4+, without the participation of phonons, is tightly related to the host crystal structure. However, the intensity of the intrinsic ZPL is much weaker than that of Stokes and anti-Stokes vibrational bands, and it always leads to a discontinuous emission peak. Regulating the ZPL of Mn4+ for a strong emission is very important but remains a challenge for perovskite-type oxides. Here, novel La1−xBaxAl1−xTixO3:0.001Mn4+ (LBAT:0.001Mn4+, x = 0–0.2) and La1−yYyAl1−yGayO3:0.001Mn4+ (LYAG:0.001Mn4+, y = 0–0.2) samples were successfully synthesized through a high-temperature solid-state reaction, and a tunable ZPL of Mn4+ was found by cationic pair substitution of Ba2+–Ti4+ and Y3+–Ga3+ for La3+–Al3+ in LaAlO3:Mn4+. The ZPL intensity is related to the local symmetry around Mn4+ and the ZPL energy corresponds to the Mn–O bond distance and the O–Mn–O bond distortion. Through co-doping Ba2+–Ti4+, the ZPL at 710 nm is enhanced and the intensity increases continuously with increasing the x value, due to the local symmetric degree of Mn4+ decreasing slowly. However, Y3+–Ga3+ co-doping induces a linear and quick increase in the intensity of ZPL at 704 nm with increasing y value, due to the local symmetric degree of Mn4+ decreasing quickly. The octahedral tilting distortion is very important for the local symmetry. Ba2+–Ti4+ co-doping reduces octahedral tilting distortion, but Y3+–Ga3+ co-doping induces a serious octahedral tilting distortion. Consequently, the ZPL emission exhibits an octahedral-tilting dependent behavior. Mainly due to the larger distortion of the O–Mn–O bond, the energy of ZPL for LYAG:0.001Mn4+ is higher than that for LBAT:0.001Mn4+. The outcomes of this work provide a promising way to regulate the ZPL intensity and energy by tuning the local structure around Mn4+, and may have wide implications for Mn4+-doped phosphors and solid-state lighting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 17
·6010
·
IF 3.4
Longfei Yuan,Taixin Zhou,Fengmin Jin,Guohong Liang,Yuxiang Liao,Aijuan Zhao,Wenbo Yan
Transmission electron microscopy (TEM) is an excellent characterization method to analyze the size, morphology, crystalline state, and microstructure of perovskite quantum dots (PeQDs). Nevertheless, the electron beam of TEM as an illumination source provides high energy, which causes morphological variation (fusion and melting) and recession of the crystalline structure in low radiolysis tolerance specimens. Hence, a novel and facile strategy is proposed: electron beam peel [PbBr6]4−octahedron defects from the surface of QDs to optimize the crystal structure. TEM and high-angle annular dark-field scanning TEM (HAADF) tests indicate that the [PbBr6]4−octahedron would be peeled from the surface of QDs when QDs samples were irradiated under high-power irradiation, and then a clear image would be obtained. To avoid interference from a protective film of “carbon deposits” on the surface of the sample when using high resolution TEM, amorphous carbon film (15–20 nm) was deposited on the surface of QDs film and then characterized by TEM and HAADF. The detection consequences showed that the defection of PbBr2on the surface of QDs will gradually disappear with the extension of radiation time, which further verifies the conjecture.Keywords:transmission electron microscopy;perovskite quantum dots;[PbBr6]4−octahedron;defect
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 24
·245709
·
IF 3.953
Ping Rong,Yi Liu,Shiyong Gao,Huiqing Lu,Shuai Ren,Lin Li,Xinzhi Ma,Qicheng Zhou,Junpei Chen,Jinzhong Wang
A novel CaIn2S4 with three-dimensional octahedral nano-blocks (ONBs) are successfully synthesized on fluorine-doped tin oxide (FTO) substrate by a simple hydrothermal method. The CaIn2S4 ONBs are uniform grown and scattered on the whole FTO substrate with high regular and symmetric morphology as well as average diagonal length of about 600 nm. Based on the as-synthesized CaIn2S4 ONBs, a photodetector (PD) is fabricated. Satisfyingly, it is found that the CaIn2S4 ONBs PD achieves a broad-band response ranging from ultraviolet (UV) to visible ( vis) light at zero bias voltage. It is also significant that the CaIn2S4 ONBs PD enables a fast response, in which the rise time and decay time are less than 0.15 and 0.2 s, respectively. Furthermore, the morphological evolution of the CaIn2S4 ONBs and plausible UV/vis detection mechanism of the CaIn2S4 ONBs PD are discussed.
研究领域:
材料科学
·
光电材料
·
纳米技术
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Shanshan Yin,Jie Wang,Qiangqiang Tong,Xizhuo Jiang,Peng Lu,Qianqian Zhu,Qiaohong Zhang,Zhenxin Zhang,Wataru Ueda
Ciprofloxacin, a widely used fluoroquinolone antibiotic, is found in drinking water as a pseudo-persistent pollutant. Zeolitic octahedral metal oxide based on ε -Keggin ironmolybdate (MoFeO) is synthesized as an efficient catalyst for ciprofloxacin degradation with H 2 O 2 . Higher than 80% of ciprofloxacin is degraded in the pH range from 5 to 8, and the highest degradation percent is achieved at pH 8. The catalyst shows high stability as a heterogeneous catalyst and can be reused up for 3 times in continues ciprofloxacin degradation. Presence of humic acid has no effect on the ciprofloxacin degradation catalyzed by MoFeO, and ciprofloxacin is efficiently degraded in the water from city tap, river, pond, lake, and sea with various dissolved organic matter concentrations and conductivities.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2013
·Vol. 143
·期 10
·1030-1034
·
IF 2.244
Zhang Jing,Yao Weifeng,Liu Mingshuang,Xu Qunjie,Wu Qiang,Zeng Tao
Abstract Synthesis of monodisperse Pt nanocrystals with cubic and cuboctahedral shapes were successfully done by using a chemical reduction method. The catalytic performance of Pt nanoparticles toward methanol electrooxidation was measured. The results indicate that Pt cuboctahedra with external Pt{100} and Pt{111} crystallographic facets showed a higher catalytic activity for methanol electrooxidation than the commercial Pt/C catalyst. Graphical Abstract
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 4
·2367-2374
·
IF 11.301
Lu Wang,Shengdong Sun,Huajie Luo,Yang Ren,Hui Liu,Xianran Xing,Jun Chen
The realization of high piezoelectric performance and excellent temperature stability simultaneously in Pb-free ceramics is the key for replacing Pb-containing perovskites in the industry. In this study, large piezoelectric performance (d33 = 354 pC N−1) was achieved in a wide temperature sinterable potassium-free NaNbO3–BaTiO3–BaSnO3 system, which is twice more than the piezoelectricity found in NaNbO3–BaTiO3 binary ceramics. Structural refinement of high-energy synchrotron powder diffraction data suggests a single tetragonal structure with P4bm symmetry for the studied NaNbO3-based Pb-free ceramic. The results indicate that the small axial ratio favoring polarization reorientation benefits strong piezoelectricity, while the large oxygen octahedron tilt enhances the stability of the P4bm structure during the changing temperature according to the in situ high-energy synchrotron X-ray diffraction measurements and provides the foundation for the excellent thermal stability (20–100 °C) of the piezoelectric properties. A single tetragonal phase with a tiny axial ratio and large oxygen octahedron tilt effectively balances the piezoelectricity and thermal stability in Pb-free systems.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Chemistry-An Asian Journal
·
2024
·Vol. 19
·期 15
·e202400447
·
IF 3.5
Bingqi Wang,Pan Liu,Alberto J. Fernández-Carrión,Hui Fu,XiuHui Zhu,Xing Ming,Weixiong You,Zongliang Xiao,Mingxue Tang,Xiuyun Lei,Congling Yin,Xiaojun Kuang
The In-based double perovskite halides have been widely studied for promising optical-electric applications. The halide hexagonal perovskite Cs 2 LiInCl 6 was isolated using solid-state reactions and investigated using X-ray diffraction and solid-state NMR spectra. The material adopts a 12-layered hexagonal structure (12 R ) consisting of layered cationic orders driven by the cationic charge difference and has Li + cations in the terminal site and In 3+ in the central site of face-shared octahedron trimers. Such a cationic ordering pattern is stabilized by electrostatic repulsions between the next-nearest neighboring cations in the trimers. The LiCl 6 octahedron displays large distortion and is confirmed by 7 Li SS NMR in the Cs 2 LiInCl 6 . The Cs 2 LiInCl 6 material has a direct bandgap of ~4.98 eV. The Cs 2 LiInCl 6 : Mn 2+ displays redshift luminescence (centered at ~610–622 nm) from the substituted Mn 2+ emission in octahedron with larger PLQY (17.8 %–48 %) compared with that of Cs 2 NaInCl 6 : Mn 2+ . The Mn-doped materials show luminescent concentration quenching and thermal quenching. The composition Cs 2 Li 0.99 In 0.99 Mn 0.02 Cl 6 exhibits the highest PL intensity, a maximum PLQY of 48 %, and high luminescent retention rate of ~86 % below 400 K and is suitable for application for pc-LED. These findings contribute to our understanding of the chloride perovskites and hold potential for widespread optical applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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