Aqueous rechargeable zinc-ion batteries(ZIBs)have recently attracted increasing research interest due to their unparalleled safety,fantastic cost competitiveness and promising capacity advantages compared with the com...
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Aqueous rechargeable zinc-ion batteries(ZIBs)have recently attracted increasing research interest due to their unparalleled safety,fantastic cost competitiveness and promising capacity advantages compared with the commercial lithium ion ***,the disputed energy storage mechanism has been a confusing issue restraining the development of *** a lot of efforts have been dedicated to the exploration in battery chemistry,a comprehensive review that focuses on summarizing the energy storage mechanisms of ZIBs is ***,the energy storage mechanisms of aqueous rechargeable ZIBs are systematically reviewed in detail and summarized as four types,which are traditional Zn^(2+)insertion chemistry,dual ions co-insertion,chemical conversion reaction and coordination reaction of Zn^(2+)with organic ***,the promising exploration directions and rational prospects are also proposed in this review.
MXenes have emerged as a new kind of 2D transition metal carbides,nitrides and *** from the unique 2D structure with a luxuriant combination of elements,MXenes drive a series of the investigations related to energy st...
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MXenes have emerged as a new kind of 2D transition metal carbides,nitrides and *** from the unique 2D structure with a luxuriant combination of elements,MXenes drive a series of the investigations related to energy storage and conversion,biometrics and sensing,lighting,purification and *** 2D layered MXene materials,the interspacing confined by the independent MXenes layers affords a distinct confinement space,which is similar to a nanoreactor that can be utilized for the storage of ions,nanoparticles,nanowires,and the materials with 2D or 3D *** fillings confined by MXene layers afford new opptunities for achieving improved properties and performance via complementary natural features,further the synergistic ***,we summarize the recent reports concerning with the confinded MXenes spacing and the *** modification of interlayer distance lead by the intercalants were *** expect that our review may offer the route for a series of ongoing studies to address the MXenes.
Ductile-to-brittle transition(DBT)is a well-known phenomenon in body-centered-cubic(BCC)metals,in-termetallics and semiconductor materials.A quantitative prediction of the DBT temperature,however,has so far remained *...
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Ductile-to-brittle transition(DBT)is a well-known phenomenon in body-centered-cubic(BCC)metals,in-termetallics and semiconductor materials.A quantitative prediction of the DBT temperature,however,has so far remained ***,we propose a unified model based on the efficacy of dislocation multi-plication as the controlling factor for DBT,with the dislocation source efficiency governed by the relative mobility of screw versus edge *** model successfully predicts the DBT temperature of iron,molybdenum and tungsten,and also covers the influence of grain size,initial dislocation density,and the multiplicity of dislocation sources.A comparison with experiments indicates that the model captures the key DBT features,providing new insight into the toughness of BCC metals.
Manganese-based catalysts were widely developed for catalytic removal of ozone,and the low stability and water inactivation are major *** improve removal performance of ozone,three methods were applied to modify amorp...
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Manganese-based catalysts were widely developed for catalytic removal of ozone,and the low stability and water inactivation are major *** improve removal performance of ozone,three methods were applied to modify amorphous manganese oxides,including acidification,calcination and Ce *** physiochemical properties of prepared samples were characterized,and the catalytic activity for ozone removal was *** modification methods can promote the removal of ozone by amorphous manganese oxides,and Ce modification showed the most significant *** was confirmed that the introduction of Ce markedly changed the amount and property of oxygen vacancies in amorphous manganese *** catalytic activity of Ce-MnO_(x) can be ascribed to its more content and enhanced formation ability of oxygen vacancies,larger specific surface area and higher oxygen ***,the durability tests under high relative humidity(80%)determined that Ce-MnO_(x) showed excellent stability and water *** demonstrate the promising potential of amorphously Ce-modified manganese oxides for catalytic removal of ozone.
It is widely recognized that the development of ZABs is impeded by the kinetic bottleneck of oxygen evolution reaction(OER)and oxygen reduction reaction(ORR).The application of conformational entropy strategy to oxide...
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It is widely recognized that the development of ZABs is impeded by the kinetic bottleneck of oxygen evolution reaction(OER)and oxygen reduction reaction(ORR).The application of conformational entropy strategy to oxides often involves introducing multiple elements with different properties,thereby providing outstanding bifunctional catalytic activity for OER/***,the possible underlying catalytic pathways and potential interactions between various components are still poorly *** paper presents an excellent medium-entropy perovskite oxide,Sr(FeCoNiMo)_(1/4)O_(3−δ)(lower overpotential of 301 mV at 10 mA cm^(−2)).Zinc-air batteries employing it as a cathode catalyst demonstrate excellent round-trip efficiency(62%).By combining theoretical calculation with experiments,we aim to establish the link between the electronic structure of perovskite oxides with different elemental compositions and their OER *** reveals that the conformational entropy strategy can simultaneously shift the O 2p-band center and metal d-band center of perovskite oxide towards the vicinity of the Fermi energy level,thereby triggering a more favorable lattice oxygen-participated mechanism(LOM)during the OER *** outcomes of this work provide crucial insights into the role of conformational entropy strategies in oxygen catalysis and offer potential avenues for constructing efficient and stable electrocatalysts.
Three striking and impactful extreme cold weather events successively occurred across East Asia and North America during the mid-winter of 2020/*** events open a new window to detect possible underlying physical *** a...
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Three striking and impactful extreme cold weather events successively occurred across East Asia and North America during the mid-winter of 2020/*** events open a new window to detect possible underlying physical *** analysis here indicates that the occurrences of the three events resulted from integrated effects of a concurrence of anomalous thermal conditions in three oceans and interactive Arctic-lower latitude atmospheric circulation processes,which were linked and influenced by one major sudden stratospheric warming(SSW).The North Atlantic warm blob initiated an increased poleward transient eddy heat flux,reducing the Barents-Kara seas sea ice over a warmed ocean and disrupting the stratospheric polar vortex(SPV)to induce the major *** Rossby wave trains excited by the North Atlantic warm blob and the tropical Pacific La Nina interacted with the Arctic tropospheric circulation anomalies or the tropospheric polar vortex to provide dynamic settings,steering cold polar air *** long memory of the retreated sea ice with the underlying warm ocean and the amplified tropospheric blocking highs from the midlatitudes to the Arctic intermittently fueled the increased transient eddy heat flux to sustain the SSW over a long time *** displaced or split SPV centers associated with the SSW played crucial roles in substantially intensifying the tropospheric circulation anomalies and moving the jet stream to the far south to cause cold air outbreaks to a rarely observed extreme *** results have significant implications for increasing prediction skill and improving policy decision making to enhance resilience in“One Health,One Future”.
The creep behavior and dislocation mechanism of Ni3Al-based single crystal alloys IC6 SX with crystal orientation[001] which was prepared by seed crystal method under the testing conditions of 760℃/500 MPa,760℃/540 ...
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The creep behavior and dislocation mechanism of Ni3Al-based single crystal alloys IC6 SX with crystal orientation[001] which was prepared by seed crystal method under the testing conditions of 760℃/500 MPa,760℃/540 MPa and 760℃/580 MPa were investigated. The experimental results showed that the creep properties,dislocation morphology and mechanism of this alloy were different under different stress conditions. With the stress increasing from 500 MPa to 580 MPa, the creep life decreased from more than 1000 h to 32.64 h. The cubic degree of γ’phase in single crystal alloy decreased obviously and the size of γ’phase increased. The mechanism of dislocation movement also changed with the increasing stress. It was found that after the specimen was tested under the condition of 760℃/500 MPa the dislocation network prevented the movement of dislocations and it was difficult for dislocations to enter the γ’phase from the γ/γ’interface. When the stress was 540 MPa, the dislocations cut into the γ’phase by stacking fault. Furthermore, with the stress increasing to 580 MPa, the dislocation entered the γ’phase in the form of extended dislocation and Lomer-Cottrell dislocation.
目的探究锌转运蛋白6(solute carrier family 30 member 6,SLC30A6)对人肝癌细胞系Huh7增殖、迁移和侵袭能力的影响,并利用虚拟筛选技术从中国天然产物数据库(CNPD)中筛选HCC中针对SLC30A6的潜在中药小分子抑制剂。方法通过TCGA和ICGC...
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目的探究锌转运蛋白6(solute carrier family 30 member 6,SLC30A6)对人肝癌细胞系Huh7增殖、迁移和侵袭能力的影响,并利用虚拟筛选技术从中国天然产物数据库(CNPD)中筛选HCC中针对SLC30A6的潜在中药小分子抑制剂。方法通过TCGA和ICGC数据集,分析SLC30A6在肝细胞癌(HCC)中的表达水平、临床特征及预后价值。采用慢病毒转染Huh7细胞敲低SLC30A6,通过CCK-8、EdU实验、细胞划痕实验和Transwell实验评估其对Huh7细胞的增殖、迁移和侵袭能力的影响。同时,检测其对HCC肿瘤干细胞标记物(CD44、CD133、CD90)的调控作用。基于CNPD数据库,以SLC30A6为药物靶点,运用基于对接的虚拟筛选技术进行多轮筛选,包括高通量虚拟筛选、标准精度虚拟筛选、高精度虚拟筛选,筛选出具有良好靶向性和类药性的潜在药物。 结果 SLC30A6在HCC组织中表达上调。SLC30A6的高表达与HCC患者较高的病理分期、组织学分级和甲胎蛋白水平、血管侵犯状态以及不良预后相关。敲低SLC30A6可明显抑制肝癌细胞Huh7的增殖、迁移及侵袭能力,并降低肿瘤干细胞标记物水平。通过虚拟筛选,共筛选出了6个潜在的小分子抑制剂。 结论 本研究证实SLC30A6在HCC的增殖、迁移及侵袭中的作用。SLC30A6可作为潜在的HCC预后生物标志物和治疗靶点。
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