Nanoscale
·
2020
·Vol. 12
·期 11
·6522-6528
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IF 6.895
Xuefeng Zhang,Long Gao,Min Zhao,Yanqin Miao,Zhiyuan Wang,Chengqiang Wang,Peizhi Liu,Bingshe Xu,Junjie Guo
Cesium lead halide perovskite nanocrystals (PNCs) have aroused tremendous research attention because of their excellent optoelectronic properties. Herein, we developed a facile and green low-temperature strategy free of organic solvents, in which only pure water was adopted as the solvent, to synthesize CsPbBr3 NCs. Intriguingly, although formed with the assistance of water, the obtained CsPbBr3 NCs present a cubic crystal structure, photoluminescence quantum yield (PLQY) of 75%, and narrow emission line width for bright green emission. Furthermore, both electroluminescence (EL) and photoluminescence (PL)-based light-emitting diodes (LEDs) present intrinsic green emission originating from the as-prepared CsPbBr3 NCs. Hence, this work offered a novel eco-friendly avenue for the preparation of perovskite NCs for their practical applications in LEDs.
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Nature Communications
·
2020
·Vol. 11
·期 1
·1-11
·
IF 12.121
Liu Wei,Li Jinxing,Li Wenting,Xu Hanying,Zhang Chao,Qiu Xinping
The low Coulombic efficiency during cycling hinders the application of Cobalt-free lithium-rich materials in lithium-ion batteries. Here we demonstrated that the dissolution of iron, rather than traditionally acknowledged manganese, is mainly responsible for the low Coulombic efficiency of the iron-substituted cobalt-free lithium-rich material. Besides, we presented an approach to inhibit the dissolution of transition metal ions by using concentrated electrolytes. We found that the cathode electrolyte interphase (CEI) layer formed in the concentrated electrolyte is a uniform and robust LiF-rich CEI, which is a sharp contrast with the uneven and fragile organic-rich CEI formed in the dilute electrolyte. The LiF-rich CEI not only effectively inhibits the dissolution of TMs but also stabilizes the cathode structure. The Coulombic efficiency, cycling stability, rate performance, and safety of the Fe-substituted cobalt-free lithium-rich cathode material in the concentrated electrolyte have been improved tremendously.
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CRYSTAL RESEARCH AND TECHNOLOGY
·
2022
·Vol. 57
·期 10
·2200054
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IF 1.599
Xinjun Wang,Bian Li,Fang Xu,Dapeng Wu,Yuqin Jiang,Wei Li,Kai Jiang
The composite photocatalyst composed of WO 3 and Bi 2 WO 6 can play the synergistic effect between the two individual components. Herein, a WO 3 /Bi 2 WO 6 heterogeneous material with high quality interface has been synthesized via situ growing Bi 2 WO 6 directly on the surface of WO 3 nanoplates. The photocatalytic degradation efficiency of tetracycline (TC) for BWO-3 reaches ≈92%, which is much higher than that of WO 3 (≈27%) due to the coupling effect of WO 3 and Bi 2 WO 6 . Electrochemical impedance and photocurrent measurements prove that WO 3 /Bi 2 WO 6 heterogeneous material has decreased carriers’ transfer resistance and higher photocurrent density, which endows its improved photocatalytic performance. Also, the radical trapping experiment proves that superoxide radical has great impacts on the degradation of TC. This work provides an efficient method for developing photocatalysts with excellent performance.
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CARBOHYDRATE POLYMERS
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2018
·
IF 5.158
Jie Chen,Meizhen Huang,Lili Kong,Mengshi Lin
This study aimed to develop a jellylike flexible substrate based on nanocellulose decorated with Ag nanoparticles (Ag/NC substrate) and explore its applications for rapid in-situ pesticide detections in fruits and vegetables by surface-enhanced Raman spectroscopy (SERS). The performances of Ag/NC substrate were characterized by rhodamine 6G (R6G). The limit of detection recorded by a portable Raman spectrometer is 10 −8 M. The substrate still exhibited satisfactory sensitivity after 60-day preservation. Jellylike and slightly sticky Ag/NC substrate demonstrated good adaptabilities in attaching to sample surfaces and is suitable for in-situ SERS detection. Two types of pesticides on apple peels and cabbages were detected by rapid in-situ and non-invasive SERS method coupled with Ag/NC substrate. The lowest detectable level was 0.5 ng/cm 2 for thiram and 5 ng/cm 2 for thiabendazole, which were well below the maximum residue levels. These results demonstrate that Ag/NC substrate is sensitive for rapid in-situ multi-pesticide detection in food.
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Sustainable Energy & Fuels
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2020
·Vol. 4
·期 9
·4694-4703
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IF 5.503
Zhewen Ma,Qiuyu Zhang,Subrata Panda,Wen Zhu,Fengzhan Sun,Darvaish Khan,Jinjian Dong,Wenjiang Ding,Jianxin Zou
Nano-confinement (NC) of Mg/MgH2 in suitable host materials is a promising strategy for simultaneously tuning the thermodynamics and kinetics of Mg-based hydride materials. In the present study, the fabrication of multifunctional host materials for NC of MgH2 was firstly attempted with the aim of improving the hydrogen sorption properties of MgH2. The NC of MgH2 in the mesoporous structure of a Ni-based metal–organic-framework (denoted as MgH2@Ni-MOF) was successfully conducted via a combination of solvothermal method and wet impregnation method followed by hydrogenation at relatively lower temperatures. Structural inspections through X-ray diffraction and high resolution transmission electron microscopy demonstrate the in situ formation of Mg2NiH4 around the MgH2 nanocrystals (∼3 nm), due to the reaction between Ni ions from the Ni-MOF and Mg ions from the dibutyl-magnesium (MgBu2) precursor in a hydrogen atmosphere. Hydrogen sorption tests reveal that the thermodynamics (−65.7 ± 2.1 and 69.7 ± 2.7 kJ mol−1 H2 for ab-/desorption, respectively) and kinetics (41.5 ± 3.7 and 144.7 ± 7.8 kJ mol−1 H2 for ab-/desorption, respectively) of Mg/MgH2 in the MgH2@Ni-MOF composite have been significantly improved. Meanwhile, the Ni-MOF scaffold acts as an “aggregation blocker” to impede the growth and agglomeration of Mg/MgH2 nanocrystals during hydriding/dehydriding cycles, leading to outstanding hydrogen cycling stability. The improvement in thermodynamics and kinetics of MgH2@Ni-MOF has been attributed to the synergistic “nanosize effect” of nanoconfined Mg/MgH2 and catalytic effects from in situ formed Mg2Ni/Mg2NiH4.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lei Gao,Yuanyuan Zhao,Yijie Chang,Kuidong Gao,Qiurui Wang,Qiang Zhang,Qunwei Tang
The presence of defects and residual tensile strain in perovskites has a significant and deleterious impact on the efficiency and stability of all-inorganic perovskite solar cells (PSCs). Here, dimethyl sulfoxide (DMSO) with strong polarity and high boiling point is introduced into the PbBr 2 precursor to delay the crystallization of PbBr 2 , leading to the formation of high-quality PbBr 2 films by delaying the solution reaching supersaturation. The formation of PbBr 2 (DMSO) adduct facilitates the complete reaction of PbBr 2 with CsBr via intramolecular exchange, thus preventing the formation of impurity phases such as CsPb 2 Br 5 . As a result, the defect density of CsPbBr 3 films decreased by 33% due to the improved phase purity, thicker films, larger grain sizes, and reduced grain boundaries. The small porosity of PbBr 2 film combined with a more complete phase-conversion process results in an expanded perovskite film that experiences compressive strain, effectively compensating for the tensile strain generated during annealing and thereby achieving the goal of strain relaxation. The optimized DMSO-based device, which exhibits compressive strain and minimal defects, achieves a remarkable efficiency of 10.11% with an open-circuit voltage of up to 1.611 V. Additionally, the unencapsulated PSC demonstrates excellent stability under 80% relative humidity and 80 °C over 30 days.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Yaru Wang,Jianjun Zhao,Xianqiang Xiong,Shengwei Liu,Yiming Xu
Anatase TiO 2 is the most studied environmental photocatalyst, but its efficiency is still not high enough to enable application. Herein we report a positive effect of Ni 2+ ions on the photocatalytic reaction in neutral aqueous solution. On addition of 1 mM Ni(ClO 4 ) 2 , the rates of phenol oxidation on TiO 2 and 0.5 wt.% Pt/TiO 2 increased by factors of 2.1 and 8.0, respectively. Meanwhile, the formation of organic intermediate was reduced, and the removal of total organic content was enhanced. Interestingly, Ni 2+ concentration did not change with irradiation time. Moreover, a maximum rate of phenol degradation was observed with Ni 2+ ions, occupying half the surface of TiO 2 or Pt/TiO 2 , where Ni(OH) + was more active than Ni(OH) 2 . X-ray photoelectron spectroscopy identified a Ni 3+ species produced in absence of phenol. A (photo)electrochemical study revealed that Ni 2+ oxidation was favored over H 2 O oxidation, whereas Ni 2+ and Pt inhibited and facilitated O 2 reduction, respectively. It is proposed that the adsorbed Ni(OH) + on TiO 2 is oxidized to Ni 3+ by the photogenerated holes of TiO 2 , followed by regeneration through phenol oxidation. The Ni 2+ -catalyzed organic oxidation then promotes the Pt-catalyzed O 2 reduction, and vice visa, resulting into the greatly improved efficiency of charge separation. This work highlights the possibility of Ni 2+ ions as the hole mediator of organic oxidation over a semiconductor.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 40
·23055-23063
·
IF 10.733
Fangxin Mao,Yan-Huan Jin,Peng Fei Liu,Pengfei Yang,Le Zhang,Luyang Chen,Xiao-Ming Cao,Jinlou Gu,Hua Gui Yang
Metal–organic frameworks (MOFs) have exhibited huge potential in the field of CO2 electroreduction but highly stable and active ones are still scarce. This study reports a (5,10,15,20-tetrakis(4-carboxyphenyl)porphyrinato)-Fe(III) chloride (FeTCPPCl) co-building UiO-66 electrocatalyst for CO2 reduction in an aqueous solution. In situ X-ray absorption spectroscopy (XAS) measurements characterized its robust structure under catalysis. The unique framework of UiO-66 provides the available proton facilitator for improving CO2 reduction activity on iron porphyrin, and a concerted proton–electron transfer (CPET) mechanism might be considered for the catalytic pathway, achieving the highest faradaic efficiency of nearly 100% at an overpotential of 450 mV for turning CO2 to CO in the reported MOFs.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2021
·
IF 7.963
Yin-Zhi Lv,Xiao-Jun Luo,Jian-Liang Zhao,Shan-Quan Wang,Bi-Xian Mai
Antibiotic levels in black-odor water could reflect the usage amount of antibiotics in population. On the other hand, these antibiotics are the source of antibiotics in the environmental water. Currently, researches on antibiotics in black-odor sediments are still lacking. In this study, 174 black and odor sediment samples from 74 cities in 28 provinces in China were collected for analysis. Among 44 targeted antibiotics, 13 antibiotics were detected in more than 30% of sediment samples. Fluoroquinolones and tetracyclines were the predominant antibiotics in these field samples, with average concentrations of up to 2074 and 1902 ng/g dry weight (dw), respectively, followed by macrolides (87.9 ng/g dw), lincosamides (8.06 ng/g dw) and sulfonamides (8.38 ng/g dw). High antibiotic contamination levels were almost always detected in black-odor sludges from economically less developed small cities; however, the difference in antibiotic concentrations between well-developed and small cities in China was not statistically significant. In addition, among the seven regions within China, no significant difference in concentrations was observed for the most antibiotics. Variances in antibiotic composition patterns in the 28 provinces of China may be due to differences in bacterial resistance, prescription habits, efficacy, and sediment carbon concentrations among various regions. There were significant positive correlations among some antibiotics in the same or different classes.
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WATER RESEARCH
·
2021
·
IF 11.236
Liang Luo,Qiang He,Zixin Ma,Duo Yi,Yi Chen,Jinxing Ma
Flow electrode capacitive deionization (FCDI) is a promising electrochemical technique for brackish water desalination; however, there are challenges in estimating the distribution of resistance and energy consumption inside a FCDI system, which hinders the optimization of the rate-limiting compartment. In this study, energy consumption of each FCDI component (e.g., flow electrodes, membranes and desalination chamber) was firstly described by using in situ potential measurement (ISPM). Results of this study showed that the energy consumption (EC) of the flow electrodes dominated under most conditions. While an increase in the carbon black content in the flow electrodes could improve the energy efficiency of the electrode component, consideration should be given to the contribution of ion exchange membranes (IEMs) and the desalination chamber to the EC. Based on the above analysis, system optimization was carried out by introducing IEMs with relatively low resistance and/or packing the desalination chamber with titanium meshes. Results showed that the voltage-driven desalination capability was increased by 39.3% with the EC reduced by 17.5% compared to the control, which overcame the tradeoff between the kinetic and energetic efficiencies. Overall, the present work facilitates our understanding of the potential drops across an FCDI system and provides insight to the optimization of system design and operation.
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Journal of CO2 Utilization
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2022
·
IF 8.321
Zi-Dan Wang,Hu-Hong Peng,Yi-Xin Guan,Shan-Jing Yao
Bioavailability of oral administration is quite limited due to hydrophobicity of most of cancer drugs. Emphasis has been placed on the development of oral drug delivery systems to enhance solubility and stability of chemotherapeutics. In this work, a novel oral drug delivery system based on emulsion was implemented to encapsulate curcumin , in which ethylcellulose was employed as oil phase polymer while gum arabic was selected as emulsifier and wall material. After processed by ultrasonic emulsification , oil-in-water emulsion loaded with curcumin was transformed from liquid state to solid particles by an improved supercritical CO 2 assisted atomization technique (SAA-HCM) to achieve its long-term stability. Effects of SAA-HCM operating conditions on sizes and distributions of microparticles were investigated in detail and particle formation mechanism was discussed. The chemical stability and amorphous form of microparticles were identified by solid characterization. In vitro drug release behavior of curcumin-loaded microparticles exhibited controlled release and enzyme triggered properties, which implies the potential in the application of colon targeted delivery. This work expands the application of SAA-HCM technique to emulsion, which will be of great importance in the design of water-insoluble drug loaded microparticles with elaborate structures.
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Natural Product Communications
·
2024
·
IF 1.5
Zhang-lin Pu,Chi Zhang,Qian Yan,Zhou Liang,Zhi-Wei Xu,Ji-hu Wei,Hua Liu,Feng Chen
Objective: We explore the pharmacodynamic targets of kaempferol in treating osteoporosis using transcriptomics and animal experiment. Methods: Firstly, we constructed an ovariectomized rat model (OVX). The anti-osteoporosis effect of kaempferol was evaluated by bone mineral density (BMD) and hematoxylin-eosin staining comprehensively. Moreover, differential genes between groups were screened by RNA sequencing technology (RNA-seq) for transcriptomics and Gene Ontology and Kyoto Encyclopedia of Genes and Genomes pathways enrichment analysis were performed. Finally, partial results of transcriptomics were verified to detect the expression of the relevant gene expression by immunohistochemistry. Results: The pharmacodynamic findings indicated that the administration of kaempferol resulted in an elevation in BMD (P < .01) and a notable enhancement in tibia microstructural indices in the experimental rats (P < .01). The transcriptomic analysis revealed that NTN1, LTBP4, GSN, and EBF1 were identified as the principal targets for therapeutic intervention in osteoporosis. The results of animal experiments showed that kaempferol promoted osteogenesis and inhibited bone resorption by downregulating the protein expression of NTN1, LTBP4, GSN, and EBF1 (P < .01). Conclusion: Kaempferol enhances BMD levels, retards tibial bone loss with structural deterioration in OVX model rats, and promotes bone formation while curbing bone resorption through NTN1, LTBP4, GSN, and EBF1 protein down-regulation.
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