JOURNAL OF MATERIALS RESEARCH
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2013
·Vol. 28
·期 11
·1498-1504
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IF 1.713
Zhi Wang,Wenfei Xu,Hui Peng,Xiaodong Tang
In this work, the morphology of BiFeO3 was successfully modulated from microsphere to microcube by using a polyanion, poly (methyl vinyl ether-alt-maleic acid) (PMVEMA), in a microwave assisted hydrothermal route. A simple ultrasonic purification method has been developed to obtain pure phase BiFeO3 from the crude products without using any chemicals. X-ray diffraction results confirmed the capability of this purification method. When increasing the amount of PMVEMA, the morphology of BiFeO3 gradually changed from microsphere to microcube as illustrated by scanning electron microscopy. A mechanism was suggested for the morphology evolution of BiFeO3. After the formation of the small BiFeO3 single crystal, PMVEMA preferentially absorbed on one side of the crystals through specific and/or noncovalent interactions, resulting in the preferential integration of these crystals to form microcubes. The magnetic properties of these microcrystals were also investigated and the magnetization of the microcubes increased with the decrease of temperature.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2023
·
IF 3.8
Jiahao Pan,Wei Wang,Min Ji,Xing Xing,Zhenda Lu
Although various methods have been developed to synthesize Ag nanocubes, their synthesis in oil phase has received little attention. We report a robust method to synthesize single-crystalline Ag nanocubes with high purity (>95%) and uniform size in oil phase. The evolution of Ag nanoparticles from different reaction times indicates that multiply twinned seeds (MTDs) and single-crystalline seeds were formed together at the early stage of the reaction. With the reaction process, the MTDs were gradually etched by chloride ions and air, and the remaining single-crystalline seeds grew into nanocubes. The effect of synthetic parameters such as temperature, air flow, and the concentration of cupric chloride and AgNO3 precursors on the morphology and size of Ag nanocubes has been systematically investigated, among which temperature plays an important role in controlling the balance between the etching rate and growth rate. Due to the slow ion diffusion rate compared to that in the water or polyol system, oil-phase synthesis provides a wide regulatory window for completely etching the MTDs, ensuring the high purity of single-crystalline Ag nanocubes.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Lei Zheng,Haili Yu,Yaling Yue,Fengjuan Wu,Yi He
We report a visual chronometric assay for Cr3+ based on the Cu2O nanocube-mediated clock reaction of methylene blue (MB) and N2H4. MB with a blue color can be easily reduced by excess N2H4 to form colorless leuco-MB in the presence of Cu2O nanocubes as a catalyst in a short time. However, the addition of Cr3+ decreases the catalytic activity of Cu2O nanocubes owing to the coordination interactions between them, leading to an increase in the reaction time. The reaction time change was employed for selective detection of Cr3+. This assay has a wide dynamic range from 0.03 to 600 μM with a limit of detection of 2.7 nM. Remarkably, different concentrations of Cr3+ can be directly detected with the naked eye by observing the color-fading speed. Additionally, this assay was successfully used to determine Cr3+ in real water samples.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Qingqing Lang,Yaohan Chen,Tianlong Huang,Lining Yang,Shuxian Zhong,Lanju Wu,Jianrong Chen,Song Bai
The integration of plasmonic metal with wide-bandgap semiconductor is a promising approach to utilize the visible light without compromise of the redox ability of photogenerated charge carriers. However, a larger work function of metal than that of semiconductor is indispensable to enable the injection of hot electrons from plasmonic metal to semiconductor. In this paper, we demonstrated that reduced graphene oxide (rGO) nanosheets as conductive “bridge” can breakthrough the restriction and transfer hot electrons from Ag of smaller work function to TiO 2 of larger work function. In the design, both of the Ag nanocubes and TiO 2 nanosheets are co-deposited on the surface of rGO nanosheets to form Ag-rGO-TiO 2 structure, which was characterized by XRD, TEM, Raman and XPS spectra. On one hand, the Ag-rGO interface facilitates the transfer of hot electrons from Ag to rGO through conductor–conductor contact. On the other hand, the new formed Schottky junction on the rGO-TiO 2 interface further pumps the transferred electrons to the surface of TiO 2 for photocatalytic reduction reaction resulted from the larger work function of rGO than that of TiO 2 . Enabled by this unique design, the hydrogen production activity achieved under visible light irradiation is dramatically enhanced in comparison with that of Ag-TiO 2 counterpart with the direct contact between the same Ag nanocubes and TiO 2 nanosheets. This work represents a step toward the rational interfacial design of plasmonic metal-semiconductor hybrid structures for broad-spectrum photocatalysis.
研究领域:
材料科学
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光化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Weiping Liu,Zhimin Dong,Jiayu Liu,Zifan Li,Youqun Wang,Xiaohong Cao,Zhibin Zhang,Yunhai Liu
Under xenon lamps, ZnFe2O4 (ZFO) has been shown to be effective in removing uranium through photocatalysis. However, its performance is still inadequate in low-light environments due to low photon utilization and high electron–hole complexation. Herein, S-doped hollow ZnFe2O4 microcubes (Sx-H-ZFO, x = 1, 3, 6, 9) were synthesized using the MOF precursor template method. The hollow morphology improves the utilization of visible light by refracting and reflecting the incident light multiple times within the confined domain. S doping narrows the band gap and shifts the conduction band position negatively, which enhances the separation, migration, and accumulation of photogenerated charges. Additionally, S doping increases the number of adsorption sites, ultimately promoting efficient surface reactions. Consequently, Sx-H-ZFO is capable of removing U(VI) in low-light environments. Under cloudy and rainy weather conditions, the photocatalytic rate of S3-H-ZFO was 100.31 μmol/(g·h), while under LED lamps (5000 Lux) it was 72.70 μmol/(g·h). More interestingly, a systematic mechanistic investigation has revealed that S doping replaces some of the oxygen atoms to enhance electron transfers and adsorption of O2. This process initiates the formation of hydrogen peroxide, which reacts directly with UO22+ to form solid studtite (UO2)O2·2H2O. Additionally, the promising magnetic separation capability of Sx-H-ZFO facilitates the recycling and reusability of the material. This work demonstrates the potential of ZnFe2O4 extraction uranium from nuclear wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Enhui Jiang,Lili Yang,Ning Song,Xiaoxu Zhang,Chunbo Liu,Hongjun Dong
It is highly desirable to combine the microstructure management and heterostructure construction technique to remold inherent wide band gap semiconductor CaTiO 3 with the purpose of enhancing its visible light absorption capacity and photocatalytic performance. Herein, a novel multi-shelled hollow cube Bi 12 O 17 Cl 2 /CaTiO 3 heterostructure has been successfully synthesized by a facile template-free method for photocatalytic hydrogen production and degradation pollutants in water under the visible light . The investigations of microstructure, physicochemical property and photoelectric behaviors indicate that the multi-shelled hollow cube architecture and synergetic effect of 2D-3D structural coupling are dominant reasons to enhance phototcatalytic performance, which can significantly improve the absorption and utilization of visible light, multiply abundant active radical generation and boost the separation and migration efficiency of photoproduced electron-hole pairs. Moreover, the probable photocatalytic reaction mechanisms, the feasible migration behaviors of photo-produced charges, the influence factors of enhancing photocatalytic activities are proposed in depth. It is intended that further innovative works on the multi-shelled hollow cube architecture design of high-performance photocatalyst by facile template-free hydrothermal method can be inspired.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jiawei Long,Tianli Han,Mengfei Zhu,Xiaoyong Xu,Jinjin Li,Junjie Niu,Jinyun Liu
Lithium-sulfur battery cathodes still remain a challenge on capacity decay due to the shuttle effect even though a series of strategies have been tried. Here we report a novel matryoshka-like CuS@void@Co 3 O 4 architecture of double micro-cubes ( μ -cubes) that locks sulfur between the CuS core and the Co 3 O 4 shell. Plenty of existing spaces between the μ -cubes suffice a high loading of sulfur and volumetric accommodation. The robust, double closed cubes configuration greatly enhances the confinement of polysulfides . In parallel, the CuS core increases the electronic conductivity and contributes to additional capacity, while the Co 3 O 4 shell ensures a better interface activity. A high Li + ion diffusion coefficient is obtained during the sulfur and lithium sulfide transformation. The constructed battery displays an initial capacity up to 1480 mAh g −1 , and a Coulombic efficiency (CE) exceeding 99%. A capacity retention higher than 500 mAh g −1 with a CE larger than 99.8% after cycling 400 times at 0.2 C are achieved. In addition, under a temperature of −5 °C, a high capacity of 700 mAh g −1 at 0.2 C after 200 cycles is achieved, indicating a good low-temperature tolerance.
研究领域:
材料科学
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电化学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 41
·6580-6588
·
IF 3.304
Pengwei Li,Dingding Li,Lina Liu,Anli Li,Cuixian Luo,Yue Xiao,Jie Hu,Huabei Jiang,Wendong Zhang
In this work, a concave structure of Cu2O truncated microcubes with {100} facet erosion has been successfully synthesized by a facile top-down etching method. Air and PVP were employed as an etchant and a shape controller agent, respectively. For the facet-selective capping of PVP on Cu2O {111} planes, the traditional relatively low energy {100} facets of Cu2O truncated microcubes would be selectively etched along their [100] zone axis in a top-down manner. The {100} facet etched Cu2O concave truncated microcubes exhibited highly improved photocatalytic activities (2.15 and 1.21 times, respectively) compared to that of the basic structure and the {111} facet etched samples on the degradation of Congo red (CR), displaying distinct facet-dependent photocatalytic characteristics, excellent stability and reusability. This work not only builds an efficient photocatalyst, but also provides a novel method to fabricate a variety of architectures with low energy facets etched and highly active crystal planes exposed, which is extremely important for the improvement of catalytic activities.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2021
·
IF 4.821
Hongxia Zhang,Xiaoli Liu,Mengmeng Xu,Jianbin Zheng
The Au-modified hollow ZnSnO 3 cubes were fabricated through a facile and effective two-step approach, and then developed an electrochemical sensor for hydrazine (N 2 H 4 ) detection. Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction spectroscopy (XRD), Energy-dispersive X-ray spectrum (EDS) and Fourier transform infrared spectroscopy (FTIR) were employed to characterize the morphology, structure and crystalline nature of the Au-modified hollow ZnSnO 3 cubes, and the results showed that Au NPs were deposited on ZnSnO 3 surface and internal cavity. Meanwhile, electrochemical investigations indicated that the proposed sensor exhibited a high current intensity at 0.66 V toward N 2 H 4 . Under optimized conditions, the sensor displayed the outstanding analytical performance to N 2 H 4 in terms of sensitivity (787.0 μA·mM −1 ·cm −2 ), linear range (0.02 μM–0.36 mM) and detection limit (0.01 μM). Compared with GNF/GCE, the sensitivity of the proposed was 2 times of improvement, the linear range was three orders of magnitude wider and the detection limit was one order of decrease. Additionally, the sensitivity of the proposed also was 4 times of TiO 2 NTs-Au@Pd/GCE. The present work may broaden the idea for constructing novel sensor and provide insights of the Au-modified hollow ZnSnO 3 cubes synthesized.
研究领域:
材料科学
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分析化学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
·
IF 3.232
Jie Zhao,Xiao Guo,Qiang He,Qiang Song,Fei Wu,Chenhui Zhang
A novel solvothermal process for synthesizing InNbO 4 nanomaterials was developed. In this manner, a series of InNbO 4 samples was synthesized. It was shown that reaction temperature and precursor pH had strong influence on the attributes of InNbO 4 samples. The X-ray diffraction patterns revealed that all the samples possessed monoclinic structure and the optimal reaction condition was found at 250 °C with a pH of 5. Scanning electron microscopy images of different InNbO 4 samples showed various morphologies. Transmission electron microscopy verified the synthesized InNbO 4 -pH 5 was single-crystal cubes . X-ray photoelectron spectra verified the existence of In, Nb, and O in InNbO 4 -pH 5 sample. The band gap of InNbO 4 -pH 5 was calculated to be 2.51 eV. The photocurrent intensity of InNbO 4 -pH 5 was the highest among the prepared samples. The photocatalytic degradation of pefloxacin was investigated using these samples. The InNbO 4 -pH 5 exhibited best degradation efficiency among these samples. The removal efficiency of pefloxacin with InNbO 4 -pH 5 could reach 80.2% in 60 min. Based on free radical capture results, superoxide radicals and holes showed to be the dominant active species. In addition, UHPLC/MS/MS was used to identify the degradation intermediates. Five new pefloxacin degradation products were found and possible degradation pathways were suggested.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Yang Li,Jingjing Yu,Jianshan Zeng,Yinyue Ye,Qiao Yin,Yingshan Zeng,Zhi Liu
The utilization of CO 2 photoreduction into valuable hydrocarbon fuels presents a promising avenue for mitigating climate change and providing a sustainable energy source. However, photogenerated carriers are highly prone to recombination, which adversely affects photocatalytic activity. In our study, we introduce a novel photocatalyst synthesis method, featuring an Ohmic contact (OC) structure that incorporates biomass-derived hollow carbon microspheres (HCM), Pd nanocubes (NC), and Indium Oxide (In 2 O 3 ) through a simple yet effective thermal reduction method. This modification significantly enhances the photocatalytic efficiency of the Pd NC/In 2 O 3 /HCM (donated as PIC) system, achieving an optimal value of 496.89 μmol∙g −1 over 5 h without the need for additional additives, 8.7-fold higher than that of the pristine In 2 O 3 . Experimental and theoretical results reveal that the substantial enhancement in CO 2 photoreduction performance can be attributed to the ultra-low resistance (122 Ω) interfaces within the PIC system, facilitating accelerated transfer of photogenerated electrons. This work provides a strategy for boosting CO 2 photoreduction efficiency by the reduction of interface resistance to promote rapid photogenerated electron migration.
研究领域:
材料科学
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环境科学
·
能源科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 9
·6735-6741
·
IF 3.201
Xiaodong Sun,Xin Yuan,Xiaopeng Li,Ling Li,Qingfeng Song,Xuliang Lv,Guangxin Gu,Mingxu Sui
In this study, hollow cube-like CuS composites derived from Cu2O crystals were synthesized via a simple one-step reaction. The formation of hollow cavities can be explained through the Kirkendall-based process. The morphologies and electromagnetic absorption (EA) properties of the CuS were measured and investigated. A sample with 35 wt% hollow CuS loading paraffin-composite achieves an optimal reflection loss (RL) of −63.99 dB at 12.09 GHz under the thickness of 2.25 mm. Simultaneously, the effective EA bandwidth (RL ≤ −10 dB) can be tuned between 4.63 and 18.00 GHz by changing the thickness of the absorber from 1.5 mm to 4.0 mm. The excellent EA performance is attributed to the high dielectric loss, appropriate impedance matching and multiple reflections induced by the unique hollow cube-like structure. Thus the hollow cube-like CuS is expected to be a promising material in approaching for microwave absorption against the electromagnetic pollution.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
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