JOURNAL OF POWER SOURCES
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2012
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IF 4.951
Jing Lin,Daobin Mu,Ying Jin,Borong Wu,Yunfeng Ma,Feng Wu
Li-rich layered composite Li[Li 0.2 Ni 0.2 Mn 0.6 ]O 2 is prepared by a novel approach in which carbon felt acts as a carrier for synthesis reaction . The as-prepared material is characterized by SEM, ICP and XRD , its electrochemical performance is also examined with galvanostatic charge/discharge and CV measurements. It is showed that the facile process controls effectively the particle growth (in size around 100–200 nm) of the composite and its chemical composition . The as-prepared material shows a high initial discharge capacity about 288 mAh g −1 when charged to 4.8 V, and a retained value of 246.8 mAh g −1 in the 40th cycle. The crystalline structure of the composite is simulated further by Material Studio. It is revealed that the composite has a compatible layer structure merged by Li 2 MnO 3 and LiNi 0.5 Mn 0.5 O 2 , which makes substantial contribution to the cycleability of the electrode. In addition, the lithiation/delithiaion properties including charge transfer resistance and lithium ion diffusion coefficient are studied with electrochemical impedance spectra.
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高影响因子
SOLID STATE IONICS
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2016
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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.
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JOURNAL OF PHYSICS D-APPLIED PHYSICS
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2024
·Vol. 57
·期 43
·435204
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IF 3.1
Pengyu Zhao,Yikang Jia,Sihong Ma,Rui Zhang,Kaiyu Li,Tianyi Song,Jianbao Zheng,Jingyao Zhang,Li Guo,Dingxin Liu,Xiaohua Wang,Mingzhe Rong
Methicillin-resistant Staphylococcus aureus (MRSA) presents a significant threat due to the multiple resistance to antibiotics, leading to severe and challenging-to-treat infections. Plasma-activated saline (PAS) prepared by plasma gases, could efficiently inactivate various pathogenic bacteria including both sensitive and antibiotic-resistant bacteria. In this study, the PAS was prepared by plasma gases with different ratios of N2 and O2 activated by gliding arc discharge. First, the gaseous reactive species in the plasma gases were compared, revealing that the highest levels of NOx including NO2 and N2O5 were generated in the gases with the N2/O2 ratios of 4:6, 5:5, and 6:4. Subsequently, the PAS prepared by the two plasma-activated gases at the N2/O2 ratios of 5:5 and 6:4 exhibited the strongest inactivation effects on both planktic MRSA and biofilms. Furthermore, the aqueous reactive species in the PAS exhibited varied change trends with the increasing N2/O2 ratios. Additionally, ultraviolet spectroscopy combined with the probe of N, N-diethyl-p-phenylenediamine was applied for the detection of O2NOO− in the PAS, and the levels of O2NOO− in the PAS were positively correlated with the inactivation effects. Moreover, the PAS induced varying levels of nitration modification on the soluble proteins in MRSA cells, which were related to the intensities of O2NOO− in the PAS. This study regulated the reactive species in the PAS through gas composition and explored the inactivation mechanism of the PAS, providing a new strategy to promote the preparation efficiency of plasma-activated solutions for biomedical applications.
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Environmental Technology & Innovation
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2024
·
IF 6.7
Yi Chen,Haolan Zhang,Siyu Hu,Jiaxin Zhang,Shiruo Zhang,Qing He,Qingyue Luo,Jinchuan Gu
Iron is the most suitable candidate for activating peroxymonosulfate (PMS) for organic degradation. To realize the effective separation and recycling of iron catalysts, it is urgent to explore a low-cost and excellent supporter. In this study, a zeolite catalyst (CAN) with both supporter and catalyst functions was synthesized in one step using lithium slag (LS, containing iron), and used to degrade tetracycline (TC) wastewater. The results showed that the electron transfer of iron and sulfur in CAN promotes the decomposition of PMS. The CAN/PMS system exhibited great removal efficiency (89.5 %, 0.083 min −1 ) and relatively lower activation energy (15.31 kJ/mol) toward TC. And • O 2 - plays a crucial role in the degradation. The CAN also represented great catalytic stability and reusability. This study revealed a new approach for the synthesis of high efficiency and low-cost catalysts and the tetracycline degradation.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Zhanshuai Li,Jinsheng Li,Huanyu Zhao,Mengwen Zhang,Pengfei Li,Liang Dong,Lei Wu,Haipeng Ji,Xiwei Qi
A new high-entropy oxide, (Ge 0.2 Mn 0.2 Ti 0.2 Sn 0.2 Mo 0.2 )O 2 with rutile structure, was successfully synthesized using solid-state reaction method. The phase structure of the ceramic samples prepared forming a range of binary to quinary phase with increasing entropy were investigated, and the effects of atmosphere-induction and high-entropy synergistic behavior on the dielectric performance were studied. As the type of the cations increases, the temperature required to form a single rutile structure gradually decreases, while the dielectric properties of the ceramics gradually improved. The dielectric constant of the (Ge 0.2 Mn 0.2 Ti 0.2 Sn 0.2 Mo 0.2 )O 2 high-entropy oxide ceramics sintered in the nitrogen atmosphere at 1350°C is nearly 20 times higher of the ceramics sintered in the air. This significant enhancement can be attributed to the occurrence of two rutile structures and the generation of excessive oxygen vacancies as a result of high-entropy synergistic behavior under the nitrogen sintering atmosphere.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Daming Yang,Yingyue Zhang,Jiaqi Sun,Xinyu Zhang,Ze Gao,Qilong Sun,Tong Wu,Wei Lu,Guiru Sun,Ming Feng
The photo-assisted strategy is viewed as a promising method to improve the ORR and OER performance of Li–O 2 batteries. Nevertheless, designing a photocatalyst that ensures wide light absorption and minimizes the recombination of photoinduced electrons and holes is still a notable challenge. In this study, 2D porous Co 3 O 4 nanosheets are synthesized as photocatalysts for photo-assisted Li–O 2 batteries. Their unique structure improves surface area, facilitates O 2 transport, and stores discharge products. Equally, the Co 3 O 4 nanosheets exhibit strong light responsiveness and photocatalytic activity. Upon optical field, photoinduced electrons and holes are successfully separated on Co 3 O 4 nanosheets, which promotes the formation and decomposition of Li 2 O 2 , respectively. Li–O 2 cells using Co 3 O 4 nanosheets display a low overpotential of 0.15 V and good cycling stability under optical field. These findings highlight the potential of Co 3 O 4 nanosheets as photocatalysts for photo-assisted Li–O 2 batteries, providing a foundation for future energy storage advancements.
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Science Bulletin
·
2018
·
IF 4.136
Zhen-Dong Yang,Zhi-Wen Chang,Qi Zhang,Keke Huang,Xin-Bo Zhang
A facile synthesis of the hierarchically porous cathode with Mo 2 C nanoparticles through the electrospinning technique and heat treatment is proposed. The carbonization temperature of the precursors is the key factor for the formation of Mo 2 C nanoparticles on the carbon nanofibers (MCNFs). Compared with the Mo 2 N nanoparticles embedded into N-doped carbon nanofibers film (MNNFs) and N-doped carbon nanofibers film (NFs), the battery with MCNFs cathode is capable of operation with a high-capacity (10,509 mAh g −1 at 100 mA g −1 ), a much reduced discharge-charge voltage gap , and a long-term life (124 cycles at 200 mA g −1 with a specific capacity limit of 500 mAh g −1 ). These excellent performances are derived from the synergy of the following advantageous factors: (1) the hierarchically self-standing and binder-free structure of MCNFs could ensure the high diffusion flux of Li + and O 2 as well as avoid clogging of the discharge product, bulk Li 2 O 2 ; (2) the well dispersed Mo 2 C nanoparticles not only afford rich active sites, but also facilitate the electronic transfer for catalysis.
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PubMed
高影响因子
Catalysis Science & Technology
·
2024
·
IF 4.4
Pengken Li,Hui Zhao,Rong Ji,Wenwen Chi,Xinyu Sun,Yuming Dong,Yongfa Zhu
A one-step two-electron oxygen reduction pathway is crucial for the stable and efficient photosynthesis of hydrogen peroxide. However, the lower oxygen adsorption and activation capacity significantly restrict the ability of the one-step two-electron oxygen reduction pathway. In this work, a covalent organic framework containing a diacetylene unit (COF-Tfp-BDDA) as an efficient oxygen reduction active site was designed for the photosynthesis of hydrogen peroxide. This work demonstrates that the introduction of the diacetylene unit efficiently improved the oxygen adsorption and activation capacity of the COF. Additionally, the introduction of a diacetylene unit effectively promoted charge separation. COF-Tfp-BDDA exhibited a superior rate of H2O2 preparation (880 μmol g−1 h−1) under visible light irradiation from pure water and oxygen, better than most COF-based photocatalysts. The catalyst exhibited a stable hydrogen peroxide photosynthesis efficiency above 100 hours in cycling experiments. Based on the experimental and DFT calculation results, the introduction of a diacetylene unit not only enhances the adsorption and activation of oxygen but also alters the reduction pathway of oxygen, leading to effective charge separation. These factors contribute to the efficient photosynthesis of hydrogen peroxide in pure water. This work provides a novel idea regarding the application of COFs in the field of solar energy conversion.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Zixian Qin,Yuxiu Sun,Zhengqing Zhang,Chenxu Zhang,Chi Tang,Chenxu Geng,Zhihua Qiao
Oxygen/nitrogen (O 2 /N 2 ) separation is of great importance but faces huge challenges owing to their similar molecular size and close polarity. In this work, we construct a polymer of intrinsic microporosity (PIM-1) based mixed matrix membrane (MMM) for efficient O 2 /N 2 separation by using ZIF-8 as the sieving filler along with surface modification of o-carborane (o-CB) to strengthen selective N 2 adsorption fixation as well as polymer-filler interfaces. Markedly, the o-CB on the outer surface of ZIF-8 not only affords the requisite interfacial compatibility in molecular sieving MMMs, but also increases the diffusion difference between O 2 and N 2 by the preferential adsorption with N 2 molecules. This synergistic effect of molecular sieving and adsorption inhibition achieves efficient O 2 /N 2 diffusion differential separation. As expected, the optimal membrane with o-CB-ZIF-8 loading of 35 wt% exhibits an O 2 permeability of 796.5 Barrer and a mixed O 2 /N 2 selectivity of 8.9 with O 2 /N 2 (20:80, vol.) mixtures, exceeding the latest 2015 upper bound limits. Moreover, the according membrane module with o-CB-ZIF-8 loading of 20 wt% also displays moderate O 2 permeability of 391.7 Barrer and O 2 /N 2 selectivity of 5.5 under pressure of 1 bar. This work may provide a feasible platform for designing high-performance MOF-based membranes in air separations.
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POLYMER
·
2024
·
IF 4.1
Zhe Cheng,Pei Wang,Yunlong Sun,Zhipeng Wang,Guangyuan Zhou
Gas separation membranes have a wide range of applications in industry, and there are two important factors in judging membrane standards permeability and selectivity. How to improve the selectivity of gas separation membranes while improving permeability is a challenge. In this study, poly (aryl ether sulfone) (PES) block copolymers were synthesized from fluorine-terminated polysulfone (PSF–F) and hydroxyl-terminated cardo PES containing phenyl substituted isoindolinone side group (PES-PPI-OH). Large side groups can enlarge the free volume and hinder chain movement to improve gas permeation behavior. Solvent-induced microphase separation of block copolymers by casting membranes with solvent benzyl alcohol (BA) can improve selectivity. The PSF- b -PES-PPI (10:10) BA membrane maintain good mechanical properties and tensile strength up to 93 MPa which compared to random polymer membrane rises to 14 MPa. Gas permeation at 23 °C showed that the O 2 /N 2 selectivity of PSF- b -PES-PPI (5:15)BA membrane was 10.6, which was the 2008 Robeson upper bound. Thus, poly (aryl ether sulfone) materials showed great potential application for O 2 /N 2 separation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Yandong Sun,Weiguang Han,Fangyuan Zhang,Hui Li,Ziqi Zhang,Xue Zhang,Boxiong Shen,Sheng-Qi Guo,Tianyi Ma
The generation of singlet oxygen ( 1 O 2 ) based on photocatalytic activation O 2 is considered to have important application prospects in purifying refractory organic pollutants in water. However, the uncertain dual pathway transformation of activated O 2 severely limits the generation of 1 O 2 . In this work, we show a robust BiOCl with dual defects (adjacent I-substitution defect and Cl vacancy) in halogen layer for the selective activation of O 2 to generate 1 O 2 . Combining experiments and theoretical calculations, we confirm that dual defects are beneficial in optimizing band structures, improving carrier separation efficiency, and promoting O 2 adsorption and activation. More importantly, it is confirmed that dual defects can directionally convert O 2 into 1 O 2 by increasing the thermodynamic conversion energy barrier of non- 1 O 2 conversion pathways and serving as a necessary site for 1 O 2 generation with dual functions of oxidation and reduction. Applying dual defect modified BiOCl to the removal of refractory aromatic pollutants in water, it is found that it has efficient and stable photocatalytic degradation efficiency and broad environmental adaptability. This work not only provides in-depth insights into the mechanism of photocatalytic activation of O 2 to selective produce 1 O 2 , but also lays the foundation for further development of highly active photocatalysts for environmental remediation and energy conversion.
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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.
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危险品化学品经营许可证（带存储）