SOLID STATE IONICS
·
2016
·
IF 2.38
Cheng-Dong Li,Jin Xu,Ji-Sheng Xia,Wei Liu,Xin Xiong,Zhu-An Zheng
The FeF 3 -coated Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 cathode materials were synthesized via a wet chemical process followed by a solid state reaction . The physical properties of the as-prepared samples were conducted using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy . The results indicated that the surface of cathode particles was covered by FeF 3 film (about 5–15 nm thick). Compared with the bare cathode, the FeF 3 -coated Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 one delivered the higher coulombic efficiency, better rate capability, longer cycle life, and better structure stability. A high capacity retention of 95% (190 mAh g − 1 ) after 100 cycles at 0.5 C rate was obtained for the FeF 3 -coated Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 cathode. Besides, the results from cyclic voltammetry and electrochemical impedance spectra revealed that the noteworthy enhanced electrochemical properties of the surface-modified sample were due to the presence of FeF 3 coating layer , which suppressed the side reaction between the Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 particles with electrolyte and further stabilized the Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 structure with cycling.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Yong Cheng,Han-Qing Zhao,Aqiang Ding,Fei Chen,Jun Liu,Dazhi Fang,Chenglong Li,Yongkui Huang,Peili Lu
The widespread application of quaternary ammonium compounds (QAC) has posed a serious hazard to the environment and human being, and high concentration of Cl − in QAC wastewater may further increase the difficulty of pollutants elimination . In this study, such a QAC wastewater under high salinity conditions was chosen as the target, the prepared Ti/(Ru x Ir y )O 2 anode exhibited favorable catalytic performance for the oxidation and mineralization of QAC under high salinity conditions. Increasing the Ru/Ir ratio of Ti-based electrode coating also slightly promoted the inner catalytic capacity. The combination of electron paramagnetic resonance (EPR) and quenching experiments indicates that 1 O 2 served as a main reactive specie in the Ti/(Ru x Ir y )O 2 electrooxidation system. The increase of pH could decrease the removal efficiency of QAC for the reduced 1 O 2 yield, and the rise of Cl − concentration could favor the QAC oxidation, and Cl − was a better electrolyte to promote the oxidation of organic contaminants when compared to Na 2 SO 4 or Na 2 CO 3 . Additionally, the conversion pathway of the model pollutant was tentatively investigated, the results demonstrated that there were almost no halogenated final products residual by electrocatalytic oxidation with Ti/(Ru x Ir y )O 2 anode. This study not only elucidate the reaction mechanism of Ti/(Ru x Ir y )O 2 anode electrocatalytic oxidation of high salinity QAC wastewater, but also may provide an efficacious and eco-friendly method for the treatment of high salinity QAC wastewater.
研究领域:
环境科学
·
污水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Jiangyao Chen,Jiajing Yi,Weikun Zhu,Weina Zhang,Taicheng An
O2 and H2O influence the photocatalytic oxidation mechanism of gaseous monoaromatics, but still in an unclear manner, due to the lack of direct evidence. Tracing an oxygen atom from 16O2 and H218O to intermediates can clarify their roles. The low H218O content suppressed the formation of benzenedicarboxaldehydes during the oxidation of xylenes and 16O2 greatly affected the yield of total intermediates, while neither of them altered the percentage order of the products. Methylbenzaldehydes, methylbenzyl alcohols, and benzenedicarboxaldehydes possessed greater 16O percentage (≥69.49%), while higher 18O distribution was observed in methylbenzoic acids and phthalide (≥59.51%). Together with the interconversion results of the products revealed, 16O2 determined the transformation of xylenes initially to methylbenzaldehydes and then to methylbenzyl alcohols or benzenedicarboxaldehydes, while H218O mainly contributed to conversion of methylbenzaldehydes to methylbenzoic acids or phthalide. Further interaction sites of xylene and its products with H2O and O2 were confirmed by molecular dynamics calculations. The same roles of 16O2 and H218O in the degradation of toluene, ethylbenzene, 1,2,4-trimethylbenzene, and 1,3,5-trimethylbenzene were also verified. This is the first report that provides direct evidence for the roles of O2 and H2O in the photocatalytic oxidation mechanism of gaseous monoaromatics. These findings are helpful to achieve controllable product formation from the oxidation of monoaromatics and predict their migration process in the atmospheric environment.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Haodong Xie,Yuan Xue,Lei Zhang,Li Liu,Xiang Ni,Wenwen Song,Jingyun Qian,Lei Wang,Hongjun Zhu
The small pore aluminosilicate zeolites are always accompanied by the abundant framework aluminum content and the consequential extra-framework counterparts severely restrained its application in the gas separation process. In this work, the high-silica zeolite ERI (Si/Al = 7.3) was successfully fabricated using a OSDA in the potassium cation medium. It is found that the spatial distribution of aluminum sites in the ERI zeolite can be effectively tailored in the synthetic system with varying aluminum content. Furthermore, the ERI frameworks with spatially biased aluminum sites were also clarified. By combining multiple spectroscopy techniques and powder X-ray diffraction crystallography, the framework of aluminum sites related to host-guest interactions confined in high-silica ERI was clarified. In the gas separation of a binary mixture of O 2 /N 2 (21:79 v /v), the Sr 2+ cation-exchanged high-silica zeolite ERI exhibited efficient O 2 adsorption capacity: 0.74 mmol·g −1 and IAST selectivity: 2.89. These findings not only provide a structural foundation but also offer a model for the efficient separation of O 2 from multi-component gas mixtures.
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2025
·
IF 17.1
Dong Wang,Hongmei Cao,Jiao Wang,Junhao Liu,Xuzhong Gong,Tao Qi,Zhi Wang
The preparation of LiNi x Co y Mn z O 2 (NCM) cathode through molten salt (MSs) reaction has great advantage in electrochemical performance due to its uniform and well-controlled reaction environment. However, the critical role of O 2- which acts as the essential reactant has never been considered. Here, homogeneous NCM523 cathode particles with low Li/Ni intermixing were synthesized in LiCl-containing molten salts, benefiting from the excellent O 2- dissolving capability of LiCl. The critical role of LiCl shows that it can either promote the uniform crystallization or leads to the collapse of the layered structure. Furthermore, by considering both O 2- solubility and low melting point, the prepared NCM523 cathode shows high specific capacity (173 mAh g −1 at 0.1 C, 4.3–2.8 V) and excellent capacity retention (96 % after 150 cycles at 1 C cycling). The NCM cathode preparing process in molten LiCl containing MSs shows both advance in thermodynamics and kinetics. This approach can also be successfully extended to other NCM cathode materials.
研究领域:
材料科学
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电化学
·
储能
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Guangjin Chen,Cuiwei Li,Hao Li,Lu Wang,Kepi Chen,Linan An
Single-phase (Ce 0.2 Zr 0.2 Ti 0.2 Sn 0.2 Ca 0.2 )O 2-δ porous high-entropy ceramics have been in-situ fabricated by foam-gelcasting-freeze drying method at different temperatures. The microstructure, phase composition, and properties of the obtained ceramics were investigated. The results indicate that compared with other porous ceramics reported in the literatures, this type of ceramics exhibits excellent performance. The sample prepared at 1350 °C shows high porosity (88.6 %), low thermal conductivity (0.023 W m -1 K -1 ), and high compressive strength (1.48 MPa). The current study suggests that porous (Ce 0.2 Zr 0.2 Ti 0.2 Sn 0.2 Ca 0.2 )O 2-δ high entropy ceramics are promising candidates for thermal insulation applications.
研究领域:
材料科学
·
陶瓷工程
·
热绝缘
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2020
·
IF 6.395
Zhaoning Song,Juncong Yuan,Zhenping Cai,Dong Lin,Xiang Feng,Nan Sheng,Yibin Liu,Xiaobo Chen,Xin Jin,De Chen,Chaohe Yang
The advocacy of green chemical industry has led to the development of highly efficient catalysts for direct gas-phase propene epoxidation with green, sustainable and simple essence. The S-1/TS-1@dendritic-SiO 2 material with three-layer core–shell structure was developed and used as the support for Au catalysts, which showed simultaneously fantastic PO formation rate, PO selectivity and stability (over 100 h) for propene epoxidation with H 2 and O 2 . It is found that silicalite-1 (S-1) core and the middle thin layer of TS-1 offer great mass transfer ability, which could be responsible for the excellent stability. The designed dendritic SiO 2 shell covers part of the acid sites on the external surface of TS-1, inhibiting the side reactions and improving the PO selectivity. Furthermore, three kinds of SiO 2 shell morphologies (i.e., dendritic, net, mesoporous shell) were designed, and relationship between shell morphology and catalytic performance was elucidated. The results in this paper harbour tremendous guiding significance for the design of highly efficient epoxidation catalysts.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2020
·
IF 6.479
Junying Hu,Qi Xiong,Longjun Chen,Chenfeng Zhang,Ziqi Zheng,Shuai Geng,Zhi Yang,Xiankang Zhong
The corrosion inhibition of carbon steel in CO 2 -O 2 -containing environment is one of the biggest challenges in flue gas injection for enhanced oil recovery. Herein we report the possibility to use Bis(2-ehylhexyl) phosphate (BEP) to inhibit the corrosion in CO 2 -O 2 -containing solution and simultaneously the inhibition mechanisms are unmasked. The results show that the corrosion is greatly inhibited with 500 ppm BEP in 1 wt% NaCl solution with 0.02 MPa CO 2 and 3 mg/L O 2 . BEP could interact with Fe and corrosion products via the formation of P-O-Fe bond and P-Fe bond to generate a barrier layer, thus, offering a protective performance.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 40
·e202404259
·
IF 1.9
Jiangwei Tao,Yixiao Qiu,Guangsu Tan,Shaoyu Yang,Wenda Li,Weiwei Wang,Yuzhu Wang,Chao Xu
Graphical This work provides in-depth investigation into the electrochemical and structural properties of O3-Na[Li 1/3 Mn 2/3 ]O 2 , a promising high-capacity anionic redox cathode material for sodium-ion batteries. Our findings also indicate that enhanced cycling stability and suppressed impedance increases can be achieved through optimized upper and lower cutoff voltages. Activating anionic redox is an effective strategy for enhancing the capacity of cathode materials in both lithium-ion and sodium-ion batteries. However, the fundamental mechanisms of O3-type sodium anionic redox cathodes remain poorly understood due to the limited availability of such materials, despite their inherent advantages such as high initial sodium content and high reversible capacity. Herein, we employ multiple characterization methods to elucidate the structural and electrochemical properties of O3-Na[Li 1/3 Mn 2/3 ]O 2 , a promising sodium anionic redox cathode developed recently, with a particular focus on the effect of cutoff voltages during electrochemical aging. Our synchrotron powder X-ray diffraction results indicate that charging the material to voltages above 4.1 V induces substantial structural changes, which compromise the structural and electrochemical reversibility of the material. This is corroborated by more rapid capacity decay and increased impedance, attributed to severe degradation on both the surface and in the bulk, as evidenced by the formation of lower valence manganese compounds. Furthermore, increasing the lower cutoff voltage for the discharge process effectively suppresses surface degradation, thereby improving cycling stability. This work offers a comprehensive understanding of a pivotal sodium anionic redox cathode material, providing valuable insights that can drive the development of advanced materials for sodium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Sharafat Ali,Izaz Ali Shah,Haiou Huang
The need for high-performance and novel technologies for selective treatment of radionuclides in water has recently stimulated broad research. In this study, we examined the ability of carbon nanotube (CNT) membranes in selective removal of strontium (Sr 2+ ) and cesium (Cs + ) from water and wastewater. In single-metal systems that contained only Sr 2+ , Cs + or their competitive metal ions, the distribution coefficients ( K d ) of functionalized CNT membranes for divalent cations, i.e., Sr 2+ , Ca 2+ , and Mg 2+ , were measured as 4.41 mmol g −1 , 2.14 mmol g −1 , and 1.30 mmol g −1 , respectively, and those for monovalent cations, i.e., Cs + , K + and Na + , were 0.81 mmol g −1 , 0.79 mmol g −1 , and 0.81 mmol g −1 , respectively. When Cs + or Sr 2+ co-existed with a competing cation, both pristine and functionalized CNT membranes showed excellent selectivity to Sr 2+ over Mg 2+ and Ca 2+ while their selectivity to Cs + over K + and Na + diminished. Moreover, the CNT membranes remained their selectivity for Sr 2+ in a wastewater effluent despite the complex water composition. Overall, the selectivity sequence of the CNT membranes for divalent cations support the occurrence of inner-sphere complexation on CNT surfaces, while that for the monovalent cations was probably determined by electrostatic interactions. This study demonstrates that Ar/O 2 plasma treatment is a greener technology for the production of CNT functionalized membranes for selective removal of contaminants from water to achieve “fit-for-purpose” treatment.
研究领域:
环境科学
·
材料科学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Shizhu Song,Tian Qin,Qi Li,Yanqing Wang,Yanfeng Tang,Lifang Zhang,Xiaojuan Liu
Facile synthesis of cost-effective carbon-supported Co single atoms (Co-SAs) exhibits huge potential applications in energy storage and conversion devices. We here report the implantation of Co-SAs into hollow carbon spheres (Co-SAs-HCS) via a facile wet-chemistry strategy followed by controlled pyrolysis. Electron-rich histidine acted as a Lewis base effectively immobilizing Co2+ (Lewis acid) via the electrostatic effect and hydrogen bonds, thus achieving the scalable synthesis of Co-SAs-HCS. We constructed a series of histidine-Co2+ structure models to elucidate the formation of histidine-Co2+ complexes by analyzing their binding energy. X-ray absorption fine-structure results verify that central Co atoms with four N coordination atoms possess a non-planar Co-N4 structure. Electrochemical results indicate that the as-prepared Co-SAs-HCS catalyst shows a low potential difference (0.809 V) between the oxygen evolution reaction potential at 10 mA cm–2 and the oxygen reduction reaction half-wave potential, outperforming the commercial Pt/C catalysts (0.996 V). Moreover, an assembled Zn-air battery based on Co-SAs-HCS exhibits an unexpected long-term durability. We have demonstrated that non-planar Co-N4-1-O2 sites are the source for highly efficient adsorption and dissociation of O2 molecules and then reduction of the free energy of desorption of the intermediates by density functional theory. Our findings provide a new design insight into the exploration of advanced electrocatalysts, which will be applied in the design of green energy devices in the future.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2016
·
IF 5.886
Hong Huang,Fangyuan Dong,Yang Tian
Intracellular pH undertakes critical functions in the formation of a proton gradient and electrochemical potential that drives the adenosine triphosphate synthesis. It is also involved in various metabolic processes occurring in mitochondria, such as the generation of reactive oxygen species, calcium regulation, as well as the triggering of cell proliferation and apoptosis. Meanwhile, the aberrant accumulation of O2•– within mitochondria is frequently intertwined with mitochondrial dysfunction and disease development. To disentangle the complicated inter-relationship between pH and O2•– in the signal transduction and homeostasis in mitochondria, herein we developed a mitochondria-targeted single fluorescent probe for simultaneous sensing and imaging of pH and O2•– in mitochondria. CdSe/ZnS quantum dots encapsulated in silica shell was designed as an inner reference element for providing a built-in correction, as well as employed as a carrier to assemble the responsive elements for O2•– and pH, together with mitochondria-targeted molecule. The developed nanosensor demonstrated high accuracy and selectivity for pH and O2•– sensing, against other ROS, metal ions, and amino acids. The remarkable analytical performance of the present nanosensor, as well as good biocompatibility, established an accurate and selective approach for real-time imaging and biosensing of O2•– and pH in mitochondria of live cells.
研究领域:
生物化学
·
分子生物学
·
分析化学
·
细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）