ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Chun-xian Zhou,Peng-bo Wang,Bao Zhang,Lin-bo Tang,Hui Tong,Zhen-jiang He,Jun-chao Zheng
Li-rich cathode materials are regarded as ideal cathode materials, owing to their excellent electrochemical capacity. However, residual lithium compounds, which are formed on the surface of the materials by reacting with moisture and carbon dioxide in ambient atmosphere, can impair the surface structure, injure the capacity, and impede the electrode fabrication using Li-rich materials. Exposure to air atmosphere causes the formation of residual lithium compounds; the formation of such compounds is believed to be related to humidity, temperature, and time during handling and storage. In this study, we demonstrated for the first time an artificial strategy for controlling time, temperature, and humidity to accelerate exposure. The formation and effect of residual lithium compounds on Li-rich cathode material Li1.35[Ni0.35Mn0.65]O2 were systematically investigated. The residual lithium compounds formed possessed primarily an amorphous structure and were partially coated on the surface. These compounds include LiOH, Li2O, and Li2CO3. Li2CO3 is the major component in residual lithium compounds. The presence of residual lithium compounds on the material surface led to a high discharge capacity loss and large discharge voltage fading. Understanding the formation and suppressing the effect of residual lithium compounds will help prevent their unfavorable effects and improve the electrochemical performance.
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DOI
PubMed
高影响因子
TALANTA
·
2019
·
IF 4.916
Yue Du,Yonghai Song,Juan Hao,Keying Cai,Nan Liu,Li Yang,Li Wang
A novel ratiometric fluorescent sensor for superoxide radical (O 2 •− ) detection was developed based on Schiff base polymer (SBP)/rhodamine-B (SBP/RDB) nanocomposites. The SBP/RDB was investigated by atomic force microscopy , scanning electron microscopy, transmission electron microscopy , X-ray powder diffraction, Fourier transform infrared spectroscopy, N 2 adsorption/desorption isotherms and fluorescence spectroscopy, etc. The results showed the SBP was two-dimensional (2D) crystalline nanosheet with the thickness of 0.5 nm. RDB could be self-assembled on each of 2D SBP surface to form SBP/RDB due to the hydrogen bond between N atoms of SBP and –COOH of RDB as well as π-π interaction. The SBP/RDB exhibited the characteristic fluorescence emission of both SBP at 485 nm and RDB at 585 nm under an excitation of 270 nm. The 2D SBP was not only acted as template to assemble RDB, but also used as reference fluorescence for O 2 •− detection. The SBP/RDB fluorescence probe for O 2 •− detection demonstrated high sensitivity and selectivity with good linear range (11.1 ± 0.76 nM–8.0 ± 0.36 μM) and low detection limit (3.7 ± 0.42 nM). Because of the low cost and simple operation, the work sheds some new light to construct ratiometric fluorescent sensors based on SBP to detect O 2 •− in drinking water and human blood serum for commercial applications.
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 37
·16230-16242
·
IF 2.7
Liang Wei,Sihong Li,Haibo Wang,Zimei Mo,Junji Chen,Meng Li,Hongxi Zhang,Jing Yang,Xiande Yang
Aflatoxin B1 (AFB1), a mycotoxin commonly found in foodstuffs, poses significant health risks when ingested through contaminated food sources. Therefore, it is imperative to devise a safe and efficient method for AFB1 degradation. Graphitic carbon nitride (g-C3N4) stands out as an exceptionally stable, non-toxic, and economical photocatalyst, which is widely used in photocatalysis. In this study, we explored the photocatalytic performance of four g-C3N4 catalysts derived from different precursors (dicyandiamide (D-CN), melamine (M-CN), thiourea (T-CN), and urea (U-CN)) in AFB1 degradation under visible light. Notably, the U-CN catalyst displayed an impressive degradation rate of 93.5% for AFB1 within 30 min, outperforming M-CN (82.5%), T-CN (78.5%), and D-CN (46.2%). This superior performance is attributed to its inherent porous structure, enlarged specific surface area, and reduced electron–hole pairs’ recombination rate. Additionally, our investigation identified ˙O2− as the primary active species in AFB1 degradation. Furthermore, we explored the degradation pathway of AFB1 and its associated inactivation mechanism mediated by the U-CN catalyst. This work provides a theoretical foundation for developing highly efficient photocatalysts in AFB1 degradation.
研究领域:
环境科学
·
化学
·
材料科学
·
毒理学
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 6
·2558-2568
·
IF 2.7
Shiman Zhou,Qianqian Zhu,Denan Li,Lifeng Zhang,Yanshuo Li,Zhenxin Zhang
Tetrabromobisphenol A (TBBPA), a prevalent brominated flame retardant, poses significant environmental and health risks, necessitating its removal. In this study, WO3 with different structures was synthesized for TBBPA photodegradation under visible light using H2O2 and O2 as oxidants. The catalyst exhibited robust stability and reusability, rendering it suitable for practical applications. The crystalline structure and surface structure of WO3 controlled its catalytic activity towards TBBPA photodegradation. Monoclinic WO3 with the (022) plane was found to be the most active for ˙O2− active species generation from H2O2 and thus active for TBBPA degradation. Degradation product analysis showed that the catalyst was active not only for the removal of TBBPA, but also for the debromination of TBBPA. Nearly 100% debromination was achieved.
研究领域:
环境科学
·
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 109
·期 1
·e70407
·
IF 3.8
Yuwei Zhang,Cuiwei Li,Guangjin Chen,Chenran Zhao,Zhikun Song,Kepi Chen,Haoran Sun,Linghao Wu,Junhui Xiang
A series of (Y, Yb, Zr, Hf, Sn, W)O 2−δ high-entropy ceramics with varying mole fraction of main elements were synthesized for the first time through the solid-state reaction synthesis method. The microstructure, phase composition, and properties of the prepared materials were thoroughly analyzed and tested. The results indicate that the phase composition transformed from a single-phase fluorite structure to a single-phase C-type rare earth sesquioxide structure as the mole fraction of +3 cations increases. The thermal conductivity of the prepared high-entropy ceramics with porosity of 49.8%–50.1% is very low ranging from 0.33 to 0.37 W·m −1 ·K −1 . Among them, the single-phase C-type rare earth sesquioxide with a higher oxygen vacancy concentration was employed as a catalyst in the CO 2 hydrogenation reaction, attaining a high CO 2 conversion rate of 82.0%. The obtained results have deepened understanding of the role of oxygen vacancies and have important guiding significance for the study of high-entropy oxides with fluorite derived structures.
研究领域:
材料科学
·
陶瓷
·
催化
·
能源材料
·
固态化学
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Meichao Gao,Jinxiang Yang,Tao Sun,Zizhong Zhang,Dafeng Zhang,Huijuan Huang,Huaxiang Lin,Yi Fang,Xuxu Wang
The photocatalytic overall conversion of CO 2 with H 2 O to chemical fuel and oxygen mimicking natural photosynthesis is a huge challenge in photocatalysis. This work shows the achievement of the solar-driven photocatalytic overall CO 2 reduction with H 2 O to CO and O 2 over a Persian buttercup-like BiOBr x Cl 1-x solid solution. A CO generation rate of 15.86 μmol g −1 h −1 with the approximate stoichiometric O 2 evolution is yielded on BiOBr 0.6 Cl 0.4 solid solution under simulated solar light irradiation, which was about 7.5 and 10.2 times higher than that of pure BiOCl (2.11 μmol g −1 h −1 ) and BiOBr (1.55 μmol g −1 h −1 ), respectively. The enhanced photoactivity is contributed to the mediate band gap and energy level tuned by the formation of BiOBr x Cl 1-x solid solution to facilitate the separation of photogenerated charges. Besides the unique electron structure, the photoinduced oxygen vacancy (O V ) formed on BiOBr x Cl 1-x solid solution also plays an important role in the CO 2 reduction.
研究领域:
化学
·
材料科学
·
环境科学
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DOI
高影响因子
AICHE JOURNAL
·
2026
·
IF 4
Zhiheng Wang,Ningning Wu,Jiali Huang,Tuo Ji,Han Lin,Liwen Mu,Xiaohua Lu,Jiahua Zhu
Direct synthesis of hydrogen peroxide (DSHP) from H 2 and O 2 is indeed a promising sustainable alternative to the conventional anthraquinone oxidation process, yet achieving high H 2 O 2 productivity and selectivity simultaneously remains a significant challenge. Herein, we designed a diode-inspired interfacial microenvironment to address this challenge by synchronizing the kinetic relay of the key transport and reaction steps in DSHP. Specifically, this microenvironment was fabricated by grafting hydrophobic silane molecules onto the carbon surface followed by loading palladium nanoparticles. Results indicate that the interfacial microenvironment enables an efficient relay of H 2 dissociation, H 2 O 2 formation and desorption, shutting down the reverse path of the side reaction. Benefiting from this diode-inspired interfacial design, high H 2 O 2 productivity of 21,647.1 mol kg Pd −1 h −1 and H 2 O 2 selectivity of 93.3% were successfully achieved under ambient conditions. This work demonstrated the critical role of the interfacial microenvironment in regulating the synergy between mass transfer and reaction in heterogeneous reaction.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Yingfei Hou,Lin Jiang,Yaoyao Zhang,Zhiwen Qin,Chi Jiang,Ming Wang
Lithium-air (also known as lithium-oxygen) batteries have attracted considerable global attention in recent years due to their extremely high energy density (11,140 W·h·kg −1 ). The electrolyte is a key element in lithium-air batteries and the traditional organic electrolyte has great safety risk due to leakage. On the contrary, the polymer electrolyte has the advantages of high safety, high stability and easy processing comparing with the organic liquid electrolytes. In this paper, a new idea was proposed to coat the Nafion membrane on a layer of polymer for blocking the oxidation reduction electric (RM) and Li based on the selective permeability on lithium ion of the Nafion membrane. Self-made thickness-controllable Nafion membrane, polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) and 2,2,6,6-tetramethylpiperidinooxy (TEMPO) were used to prepare a quasi solid polymer electrolyte (NSPE). Electrochemical workstation and LAND battery testing system were used to perform a galvanostatic charge/discharge test on Li-O 2 . The ionic conductivity of NSPE was 4.3 × 10 −4 S·cm −1 at room temperature and the discharge platform was 2.6 V and the charging voltage was 3.7 V after 50 cycles with the cut-off capacity of 500 mA·h·g −1 .
研究领域:
材料科学
·
电化学
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DOI
高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Miao Lai,Jie Zhao,Qingcai Chen,Shuaijun Feng,Yujie Bai,Yingxuan Li,Chuanyi Wang
In the photocatalytic volatile organic compounds (VOCs) degradation, the accumulation of intermediate products on the surface of catalysts could cause a decrease in activity through retarding reactant (e.g. O 2 ) supply to surface active sites. Herein, Bi decorated TiO 2 photocatalysts (Bi/TiO 2 ) for photocatalytic toluene degradation were prepared and systematically studied. It is found that metallic Bi modification improves the ability of photocatalysts to capture O 2 . As a result, the activities of the Bi/TiO 2 photocatalysts are obviously higher than that of the TiO 2 for photocatalytic toluene degradation, and the productions of photogenerated reactive oxygen species ( O 2 − and H 2 O 2 ) over the Bi/TiO 2 photocatalysts are almost equal to that over the TiO 2 despite the fact that the separation efficiency of photoinduced charge carriers is decreased after the addition of Bi. Adsorbed benzaldehyde is the main surface intermediate on the surface of the Bi/TiO 2 photocatalysts, whereas plenty of more readily oxidized aliphatic carboxylate species was monitored on the surface of the TiO 2 , which can be attributed to insufficient O 2 supply to the TiO 2 surface. This further indicates the positive role of the promoted O 2 supply by Bi in the photocatalytic toluene degradation. The present work offers a new window for addressing the catalyst deactivation in the photocatalytic VOCs degradation.
研究领域:
环境催化
·
大气污染控制
·
材料化学
·
表面科学
·
光化学
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DOI
高影响因子
ChemSusChem
·
2017
·Vol. 10
·期 7
·1385-1389
·
IF 7.226
Hao Wan,Ya Mao,Zixuan Liu,Qingyou Bai,Zhe Peng,Jingjing Bao,Gang Wu,Yang Liu,Deyu Wang,Jingying Xie
As the first step during discharge, the mass transfer of oxygen should play a crucial role in Li–air batteries to tailor the growth of discharge products, however, not enough attention has been paid to this issue. Herein, we introduce an oxygen-enriching cosolvent, 1,2-(1,1,2,2-tetrafluoroethoxy) ethane (FE1), into the electrolyte, and investigate its influence on the discharge performance. The incorporation of this novel cosolvent consistently enhances the oxygen solubility of the electrolyte, and improves the oxygen diffusivity following a volcano-shape trend peaking at 50 % FE1. It is interesting that the discharge capacities obtained with the investigated electrolytes share the similar volcano trends as the oxygen transport under 50 mA g carbon −1 and higher current densities. The improved oxygen diffusion could benefit the volumetric utilization of the air cathode, especially at the separator side, probably owing to the fast oxygen transport to moderate its concentration gradient. Our results demonstrate the importance of oxygen provision, which easily becomes the capacity-determining factor. Graphical Got Oxygen? The enhancement of oxygen provision is achieved by incorporating 1,2-(1,1,2,2-tetrafluoroethoxy) ethane as the cosolvent in the electrolyte. The oxygen's diffusivity, rather than solubility, exerts the principal effect on discharge performance of the Li–air battery, especially at higher current density, owing to the ameliorated oxygen's accessibility, which improves the utilization ratio of the whole air cathode.
研究领域:
电化学
·
能源材料
·
电池技术
·
纳米材料
·
物理化学
·
先进储能系统
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Tingshuai Yang,Chaozhu Shu,Ruixin Zheng,Minglu Li,Zhiqian Hou,Peng Hei,Qiang Zhang,Dexin Mei,Jianping Long
Gel polymer electrolytes (GPEs) have received extensive attention due to their excellent nonflammability, leak prevention, and low cost. However, low ionic conductivity at room temperature and poor interfacial stability hinder the further application of GPEs. Here, a novel GPE based on PVDF-HFP/PMMA/SiO2 (PPSE-X, X represents the mass percentage of SiO2 in the GPE) is designed and fabricated. The synthesized PPSE-15 demonstrates an organic–inorganic double complexation structure, in which two kinds of polymer cross-link, leading to the increase of lithium-ion migration amount (tli+) in PPSE-15. Moreover, polar functional group (Si–O) in the nanometer SiO2 promotes the lithium salt dissociation, regulates the Li+ deposition and thus inhibits the production of lithium dendrite. The Li/PPSE-15/Li symmetric cell can run steadily for more than 750 h at a current density of 0.5 mA cm–2. Not only that, the Li–O2 battery assembled with PPSE-15 as an electrolyte can operate over 300 cycles at room temperature. After full charge and discharge for 5 cycles, the capacity retention reaches 48.3%. In addition, the existing PPSE-15 demonstrates excellent safety and flexibility and shows great potential in high-performance Li–O2 batteries.
研究领域:
储能
·
材料科学
·
电化学
·
聚合物纳米复合材料
·
电池技术
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Akkammagari Putta Rangappa,Wei Xiong,Wenhua Xue,Xinxin Lu,Yiqi Geng,Yuchao Shao,Guohan Sun,Jun Zhao
Activation of molecular O 2 on catalytic surfaces to form reactive oxygen species (ROS) is a pivotal step in catalytic reactions. In this study, we synthesized a bimetallic Zn 3 In 2 S₆ (ZIS) catalyst enriched with Pd S interfaces via a straightforward cation exchange process between Pd 2+ and Zn 2+ . These interfaces function as electron reservoirs, and Pd incorporation significantly enhances photocatalytic performance by reorganizing the electronic structure of the ZIS matrix, thereby improving charge carrier dynamics and reaction kinetics. Additionally, Pd modification optimizes O 2 adsorption strength, preventing excessive population of the π* antibonding orbital that can lead to O O bond cleavage and reduce ROS generation. Theoretical calculations reveal that monodentate adsorption of O 2 on Pd-ZIS surfaces promotes efficient photo induced electron transfer across all excited states, enabling effective ROS activation. The combination of experimental findings and theoretical analysis identified the mechanisms underlying the improved selectivity of Pd-modified ZIS catalysts. As a result, the optimized Pd-ZIS-5 photocatalyst demonstrates a high photo-oxidation performance for HMF oxidation, achieving 92.4 % conversion, 86.3 % yield, and 93.4 % selectivity–representing a 1.7-fold improvement over prismatic ZIS. Overall, this work demonstrates how Pd doping and tailored O 2 adsorption strength enhance photocatalytic processes, offering valuable insights for advanced biomass conversion and sustainable chemical production.
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高影响因子
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