JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Dandan Ju,Feng Song,Yingdong Han,Jun Zhang,Feifei Song,Aihua Zhou,Wei Huang,Victor Zadkov
Intense white-light color emission of lanthanide-doped core-shell structured particles at microscale level was presented under 980 nm excitation. The prepared NaYF 4 :Yb/Er@ NaYF 4 :Yb/Tm microcrystals not only can effectively prevent the deleterious cross-relaxation that occurs between the Er 3+ and Tm 3+ due to the location of the activator ions within different layers, but also possess a high luminescence efficiency due to dimensions of the micro-scale structure. The core-shell structured microcrystals presented satisfactory capacity for color control in the white region. The results show great potential in attaining white light-emitting diodes within the field emission display on specific device applications. Furthermore, the core-shell microcrystals emit white-light that presents obvious and distinct lifetimes of green, red, and blue emissions, which could achieve multicolor emissions by setting a suitable delay time. This feature demonstrates that the core-shell structured microrods offer practical use as security ink to prevent forgery, such as in identifying currency.
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Nanoscale
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2019
·Vol. 11
·期 35
·16592-16598
·
IF 6.97
Jiajia Wang,Renfeng Dong,Qianxian Yang,Huiying Wu,Zijun Bi,Qiying Liang,Qinglong Wang,Chun Wang,Yongfeng Mei,Yuepeng Cai
The threat of water pollution represents a serious global concern and requires rapid and efficient neutralization methods. Herein, we report novel two-in-one light-driven micromotors, i.e., light-driven TiO2-Fe Janus micromotors with both photocatalysis and photo-Fenton processes, for efficiently degrading organic pollutants in contaminated water. The TiO2-Fe micromotors moved rapidly by utilizing the photocatalytic H2O2 decomposition over TiO2 under UV irradiation, as well as generating highly reactive oxygen species responsible for the in situ degradation of the organic pollutants into non-harmful products. Notably, such coupling of photocatalysis generated on the TiO2 sides and the photo-Fenton process generated on the Fe sides, along with the rapid movement of these catalytic Janus micromotors, results in a synergetic effect that can greatly enhance the degradation of organic pollutants. The degradation efficiency of the TiO2-Fe micromotors is 52-fold that of only Fenton effects, and it is further improved by 40% compared to photocatalytic degradation alone. Considering the excellent advantages of the high efficiency, simple structure, reusability and the bubble-driven property, the new “on-the-fly” TiO2-Fe micromotor-based method has a promising potential for future water cleaning and waste-water treatments.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 54
·期 20
·13118-13134
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IF 3.442
Zhang Xiaorong,Shakeel Muhammad,Li Baoshan,Zhang Jinxi,Wang Lei
Proficient visible light-driven photocatalyst for waste water remediation has gained immense attention in decades. Herein, novel foamed zinc oxide–silica spheres and carbon nitride nanocomposite (FZSS@CN) were fabricated by hydrothermal and calcination treatments. The resulting nanocomposite was passed through complete characterization profiling for structural, optical and kinetics properties. The photocatalytic performance was investigated by the degradation of textile dyes such as methylene blue (MB) and Rhodamine B (RhB) under visible light. The optimized nanocomposite (FZSS@CN-10) exhibited the superior photocatalytic degradation performance up to 95% for MB and 90% for RhB with rate constant ( k ) = 0.0516 min −1 and 0.0464 min −1 , respectively. This excellent performance was attributed to the hierarchical morphology, high surface area and mesoporous channels with open cavities. This uniqueness is responsible to enhance the optical and kinetic capabilities of the material for effective photocatalysis. More interestingly, the crystalline structure of the recycled sample has more sharp peaks than fresh sample. This phenomenal behavior leads to a new method for the fabrication of effective materials in this field.
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Catalysts
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2019
·Vol. 9
·期 7
·616
·
IF 3.444
Ruizhou Gan,Xiaohua Ma,Guorong Wang,Zhiliang Jin
CoSe2,as a kind of co-catalyst, would replace noble metals element to dope pure CdS. The CoSe2/CdS photocatalyst could be synthesized by simple physical mixing. With the introduction of CoSe2, especially 30% CoSe2/CdS, hydrogen production would be about 500 μmol within 5 h, five times that of pure CdS under the same conditions. The CoSe2/CdS photocatalyst could bear four cycles of hydrogen evolution and sustain the hydrogen production, with a minor decrease. In other words, the electron transition velocity would surge along with the introduction of CoSe2particles. The CoSe2could be deemed as the predator and exit of electrons to inspire the detachment of the hole-electron pairs and relieve the recombination of the hole-electron pairs.Keywords:CoSe2clusters;CdS nanorod;hydrogen evolution;photocatalysis
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Ruiyang Zhang,Penghui Li,Fang Wang,Liqun Ye,Abhijeet Gaur,Zeai Huang,Ziyan Zhao,Yang Bai,Ying Zhou
Atomically dispersed atom catalysts with atomically distributed active metal centers have attracted great attention owing to the maximum atom efficiency and excellent selectivity. Herein, for the first time, we found atomically dispersed Mo atoms can be formed on g-C 3 N 4 , and induce its amorphous transformation. This amorphous transformation leads to the formation of strong band tails with remarkably enhancing the absorbance edge of Mo-C 3 N 4 up to 750 nm, resulting in almost whole visible-light range absorption. The formation of new Mo-C and Mo-N bonds due to strong interfacial interaction between atomically dispersed Mo atoms and g-C 3 N 4 provide new electron and hole transport pathways to accelerate the separation of charge carriers. As a result, amorphous Mo/C 3 N 4 (a-Mo/C 3 N 4 ) reveals excellent photoreduction of CO 2 , yielding CO and H 2 productions of 18 and 37 μmol g −1 h −1 under visible-light illumination (λ > 420 nm), which manifest a remarkable 10.6- and 4-folds enhancement of that over crystalline g-C 3 N 4 . This finding provides a conceptually different approach to fabricate high-efficient photocatalyst through the strong interfacial interaction between atomically dispersed metal atoms and host.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Yuan Yao,Mingxuan Sun,Zihan Zhang,Xiaojing Lin,Bowen Gao,Sambandam Anandan,Wei Liu
A ternary composites of MoO 3 /Ag/TiO 2 nanotube arrays were synthesized by in-situ annealing of TiO 2 nanotube arrays impregnated with AgNO 3 over MoO 3 powders. During the annealing process , the crystallization of the TiO 2 nanotubes, the thermo-decomposition of AgNO 3 to Ag nanoparticles , and the sublimation of MoO 3 occur jointly. The photoelectrochemical measurements of the resultants indicate that MoO 3 /Ag/TiO 2 nanotube arrays present better photoelectrochemical properties compared with Ag/TiO 2 nanotube arrays and pristine TiO 2 nanotube arrays. Especially, the highest photocurrent and open circuit voltage are up to 21.29 μA/cm 2 and 0.058 V under visible light irradiation , whereas 1.77 and 3.87 times larger than those of TiO 2 nanotube arrays, respectively. Superior photoelectrochemical stability and larger photo-conversion efficiency of the ternary composites are also demonstrated. The improved photoelectrochemical properties are related to the close interfacial contact among MoO 3 , Ag, and TiO 2 as well as the surface plasma resonance of Ag in the ternary composites, which broaden the range of light response and enhance the efficiency of charge separation. This study provides a skillful solution to construct TiO 2 -based composite materials and demonstrates it is an unique architecture to promote the visible light driven photocatalytic application of TiO 2 .
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APPLIED SURFACE SCIENCE
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2019
·
IF 5.155
Hui Li,Yanlin Zhang,Qian Zhang,Yifei Wang,Yanping Fan,Xin Gao,Jing Niu
In our work, Z -scheme Ag 3 PO 4 /NG/WO 3 composites were fabricated via a facile deposition approach, which was used in the photocatalytic degradation of indomethacin (IDM) under visible light irradiation. The as-prepared Ag 3 PO 4 -based photocatalysts were characterized by X-ray diffraction analysis, scanning electron microscopy, transmission electron microscope , Fourier transform infrared, X-ray photoelectron spectroscopy and UV–visible diffuse reflectance spectroscopy in order to determine the chemical structure , morphological feature and optical performance. From the degradation experiments of IDM, the Ag 3 PO 4 /NG/WO 3 composite exhibited the highest photocatalytic activity and stability, and its kinetics constant was ~8 times of pure Ag 3 PO 4 . Furthermore, reactive species trapping experiment, electron spin resonance , liquid chromatography-mass spectrometry, total organic carbon , photoelectrochemical measurement and photoluminescence spectra were applied to analyze the possible degradation pathways and photocatalytic mechanism of IDM. The results indicated that the visible-light photocatalytic degradation of IDM using Ag 3 PO 4 /NG/WO 3 conformed to a Z -scheme photocatalysis mechanism, further facilitating the photoinduced charge carriers separation, and inhibiting the recombination of photoinduced electron-hole pairs. It also confirmed that the holes, OH and O 2 – radicals generated in Z -scheme system played the significant roles during the photocatalytic degradation of IDM.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Tan Li,Yanxi Ding,Shefiu Kareem,Fen Qiao,Ghafar Ali,Changyan Ji,Xiujian Zhao,Yi Xie
A novel facile room-temperature, hexamethyldisilazane (HMDS)-mediated strategy is demonstrated for the synthesis of all-inorganic perovskite colloidal nanocrystals (NCs). As a unique reaction-triggering and morphology-directing agent, HMDS is introduced for the first time to trigger the room-temperature reaction for generating perovskite NCs with controlled morphology and optical properties. Particularly, the stability of the resulting NCs is greatly enhanced due to the surface modification by hydrophobic -CH 3 groups from HMDS. The typical CsPbBr 3 perovskite NCs films are highly stable without significant decrease in photoluminesence (PL) intensity after being exposed to 60% relative humidity for 720 h. Moreover, no noticeable change of phase and morphology occurs even after 100 days of exposure. The representative CsPbBr 3 NCs are employed in a prototype white-light-emitting diodes (WLEDs) on 365 nm commercial GaN chip. The present strategy provides a facile and versatile route not only to control the morphology and optical properties of perovskites nanomaterials at room temperature but also enhance their stability, which will bring promising potential application for optoelectronics.
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高影响因子
Advanced Energy Materials
·
2019
·Vol. 9
·期 24
·1901016
·
IF 24.884
Fei Zheng,Weijian Chen,Tongle Bu,Kenneth P. Ghiggino,Fuzhi Huang,Yibing Cheng,Patrick Tapping,Tak W. Kee,Baohua Jia,Xiaoming Wen
Potassium (K + ) doping has been recently discovered as an effective route to suppress hysteresis and improve the performance stability of perovskite solar cells. However, the mechanism of these K + doping effects is still under debate, and rationalization of the improved performance in these perovskites is needed. Herein, the photoluminescence (PL) properties and device performance of mixed-cation mixed-halide perovskite are dynamically monitored with and without K + doping under bias light illumination via a confocal fluorescence microscope, together with ultrafast transient absorption as well as time-dependent and time-resolved PL measurements. It is demonstrated that illumination is essential to trigger the passivation effect of K + by forming KBr-like compounds, leading to the elimination of interface trapping defects and suppression of mobile ion migration, thus resulting in improved power conversion efficiency and negligible current–voltage hysteresis of solar cells. This work provides novel insight into the hysteresis suppression upon K + doping and highlights the significance of light illumination when using this protocol.
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JOURNAL OF NANOPARTICLE RESEARCH
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2019
·Vol. 21
·期 5
·1-15
·
IF 2.009
Wang Chao,Lv Bowen,Hou Jun,Wang Peifang,Miao Lingzhan,Ci Hanlin
The cerium dioxide nanoparticle (CeO 2 NP) (122 nm) aggregation process was investigated by nanoparticle tracking analysis (NTA), and the results were compared with those of dynamic light scattering (DLS). Unlike descriptions based on classical aggregation kinetics theory, the size distributions obtained by NTA and DLS show that aggregation of NPs in an aquatic environment is a complicated process and highly dependent on the particle number concentration, which is information that has been rarely presented in the literature. In particular, not all the particles were aggregated and there still remained some small CeO 2 NPs (< 400 nm), which has potential adverse environmental risks to the ecosystem and public health. Furthermore, the aggregate sizes are far smaller than previously shown in aggregation kinetics experiments. In addition, our findings also indicate that NTA can measure samples with mass concentrations ranging from 0.1 to 100 mg/L without dilution. In contrast, DLS cannot provide accurate information about aggregation kinetics when the mass concentration of CeO 2 NPs is lower than 1 mg/L (2.02 × 10 8 ± 1.66 × 10 7 by NTA data). Consequently, the classical aggregation kinetics experiment using DLS cannot accurately reflect the fate of NPs in aquatic environment, especially the heteroaggregation of NPs in complex water phase, and these results further demonstrate that the toxicity evaluation of NPs concerning different sizes measured by DLS need more rigorously experimental design. Therefore, our findings provide the first quantitative attempt to explore the experimental conditions and analytical methods for further study of aggregation kinetics.
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Smart Materials and Structures
·
2019
·Vol. 28
·期 5
·055031
·
IF 3.543
Xinzuo Huang,Fenghua Zhang,Yanju Liu,Jinsong Leng
Colorless shape memory polyimide (CSMPI) has potential applications in broad fields, especially in advanced optoelectronics due to the excellent optical transparency, shape memory effect and high temperature resistance. In this work, high flexible dianhydrides and fluorine-containing diamines were used to synthesize CSMPI, which simultaneously combined great shape memory performance with high optical transparency. The effects of monomer ratios and imidization temperatures on the molecular structure and properties were investigated. Moreover, the CSMPI film possesses a higher glass transition temperature (Tg) of 234 °C, compared with the reported transparent shape memory polymers. Most importantly, the transmittance of CSMPI film is 87%–90% at 450–800 nm, meeting the requirements of heat resistance and transmittance of the substrate. Both shape recovery and shape fixity are over 97%. Flexible and colorless CSMPI films severed as substrates provide more potential in optoelectronic devices such as OLED and OPV, etc.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2019
·
IF 5.107
Changlin Yu,Hongbo He,Wanqin Zhou,Zhen Liu,Longfu Wei
An interesting rugby-ball-like Zn 3 (PO 4 ) 2 @C 3 N 4 photocatalyst with well- controlled structures as high-efficient visible-light photocatalysts was synthesized via two steps of solvothermal-grinding calcination method. The composition, structure, morphology, and optical absorption properties of as-synthesized Zn 3 (PO 4 ) 2 @C 3 N 4 samples were intensively characterized by XRD, N 2 physical adsorption, SEM, TEM, FT-IR, UV–vis DRS, XPS, PL and photoelectrochemical measurements, respectively. The formation of C 3 N 4 shell obviously increased the surface area and induced the rich pore structures. The intimate interface between Zn 3 (PO 4 ) 2 and C 3 N 4 phase obviously enhanced the transport rate of photogenerated carriers and restrained the recombination of photogenerated electrons and holes. The optimal Zn 3 (PO 4 ) 2 @C 3 N 4 (35 wt%) exhibited the highest adsorption and photocatalytic activity in the degradation of methylene blue (MB), which was 150 and 7.5 times as high as C 3 N 4 , respectively. Moreover, the robust Zn 3 (PO 4 ) 2 @C 3 N 4 nanoheterojunctions fabricated by this grinding-calcination route have high stability in recycling reactions.
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