Mg/Al laminate with ZK60Mg and TiB2/6061Al as constitute layers was fabricated through the porthole die co-extrusion and hot rolling.The effects of rolling and roll temperatures on the microstructure,interfacial struc...Mg/Al laminate with ZK60Mg and TiB2/6061Al as constitute layers was fabricated through the porthole die co-extrusion and hot rolling.The effects of rolling and roll temperatures on the microstructure,interfacial structure,mechanical properties,and crack propagation paths were studied.The results show that the intermetallic compounds layer shows an intermittent form.The strong strain/dislocation hardening ability of Mg/Al laminate is attributed to the coupled effects of interlocking Al/βinterface,strain gradient,andβlayer with nanotwins and stacking faults.The complex dislocation structures such as network,loop,and array are found in the Al layer.Dislocation slip is the main deformation mode of the Al layer,while dislocation slip and dynamic recrystallization are the main deformation modes of the Mg layer.As roll temperature increases,prismatic〈a〉slip replaces the basal〈a〉slip as the most important slip mode.At a rolling temperature of 400℃ and a roll temperature of 150℃,an optimal synergy of mechanical properties is achieved,with ultimate tensile strength,shear strength,and elongation of 262.1 MPa,36.4 MPa,and 18.1%,respectively.As the rolling temperature increases,the fracture mode of Mg/Al laminate changes from discontinuous plastic shrinkage to transverse and longitudinal cracks.With increasing the roll temperature,the through cracks tend to form,indicating the plasticity and bonding quality of Mg/Al laminate are effectively enhanced.展开更多
Achieving high activity and stability oxygen evolution reaction(OER) catalysts to optimize the efficiency of metal-air battery, water splitting and other energy conversion devices, remains a formidable challenge.Herei...Achieving high activity and stability oxygen evolution reaction(OER) catalysts to optimize the efficiency of metal-air battery, water splitting and other energy conversion devices, remains a formidable challenge.Herein, we demonstrate the metallic porous nanowires arrays with abundant defects via nitrogen and copper codoped CoS1.97 nanowires(N-CuCoS1.97 NWs). The N-CuCoS1.97 NWs can serve as an excellent OER self-supported electrode with an overpotential of 280 mV(j = 10 m A cm-2) and remarkable long-term stability. The X-ray absorption near-edge structure(XANES) and X-ray photoelectron spectrum(XPS) measurements confirmed the surface lattice oxygen created on the N-CuCoS1.97 NWs during OER. Then, the density function theory(DFT) results evident that lattice oxygen constructed surface of N-CuCoS1.97 NWs has more favorable OER energetic profiles and absorption for reaction intermediate. More importantly,the flexible and wearable Zn-air battery fabricated by the N-CuCoS1.97 NWs shows excellent rechargeable and mechanical stability, which can be used in portable mobile device.展开更多
On November 27^(th),2024,the Center for Excellence in Brain Science and Intelligence Technology(Institute of Neuroscience,ION)at the Chinese Academy of Sciences(CAS)will commemorate its 25th Anniversary by reviewing i...On November 27^(th),2024,the Center for Excellence in Brain Science and Intelligence Technology(Institute of Neuroscience,ION)at the Chinese Academy of Sciences(CAS)will commemorate its 25th Anniversary by reviewing its development and highlighting its research achievements.Aligned with the anniversary celebrations,Neuroscience Bulletin organized this special academic issue as part of these festivities.This issue features curated and invited submissions from neuroscientists who are currently affiliated with or have previously studied or worked at the ION.The selected papers showcase the institute’s scientific achievements and academic impact,honoring its legacy while inspiring future advancements in the field of neuroscience.Eight Original Articles,four Letters,one Insight,and three Reviews are included.These contributions span multiple dimensions of neuroscience,from molecular mechanisms to cognitive and behavioral insights,each offering a unique perspective on the complexities of the brain.展开更多
Stable oxygen evolution reaction(OER)catalyst alternatives to the precious IrO_(2) catalysts are of great importance to the next-generation proton-exchange membrane(PEM)electrolyzers.RuO_(2)-based materials are promis...Stable oxygen evolution reaction(OER)catalyst alternatives to the precious IrO_(2) catalysts are of great importance to the next-generation proton-exchange membrane(PEM)electrolyzers.RuO_(2)-based materials are promising candidates but suffer from low stability under highly anodic potentials.Here,we reported a facet-selective etching strategy to improve the stability of polycrystalline RuO_(2) without significantly affecting the activity.The selective etching was enabled by the specific chemisorption of pyridazine(pyd)with contingent N atoms onto the RuO_(2) surface.The pyd-RuO_(2) catalyst,after etching,exhibited a low overpotential 247 mV at 100 mA·cm^(-2) and obvious stability improvement of over 200 h at 100 mA·cm^(-2) with only 0.63% Ru loss in acidic conditions.Combining various characterization techniques and theoretical calculations,we revealed that the crystalline RuO_(2)(110)facet is favorably etched by the coordination of pyridazine while protecting other surfaces,which significantly enriches the RuO_(2)(110)facets toward higher OER stability via the dynamic dissolution and repair mechanism in the ordered manner.This study offers alternative perspectives on the dissolution and stability mechanism of RuO_(2) and the facet-selective modulation of nanocrystals by ligand-driven etching.展开更多
基金supported by the National Natural Science Foundation of China(Nos.52175338 and 52222510)Science Fund for Distinguished Young Scholars of Shandong Province(No.ZR2021JQ21)+1 种基金Key Research and Development Program of Shandong Province(No.2021ZLGX01)The Excellent Young Team Project of Central Universities(No.2023QNTD002).
文摘Mg/Al laminate with ZK60Mg and TiB2/6061Al as constitute layers was fabricated through the porthole die co-extrusion and hot rolling.The effects of rolling and roll temperatures on the microstructure,interfacial structure,mechanical properties,and crack propagation paths were studied.The results show that the intermetallic compounds layer shows an intermittent form.The strong strain/dislocation hardening ability of Mg/Al laminate is attributed to the coupled effects of interlocking Al/βinterface,strain gradient,andβlayer with nanotwins and stacking faults.The complex dislocation structures such as network,loop,and array are found in the Al layer.Dislocation slip is the main deformation mode of the Al layer,while dislocation slip and dynamic recrystallization are the main deformation modes of the Mg layer.As roll temperature increases,prismatic〈a〉slip replaces the basal〈a〉slip as the most important slip mode.At a rolling temperature of 400℃ and a roll temperature of 150℃,an optimal synergy of mechanical properties is achieved,with ultimate tensile strength,shear strength,and elongation of 262.1 MPa,36.4 MPa,and 18.1%,respectively.As the rolling temperature increases,the fracture mode of Mg/Al laminate changes from discontinuous plastic shrinkage to transverse and longitudinal cracks.With increasing the roll temperature,the through cracks tend to form,indicating the plasticity and bonding quality of Mg/Al laminate are effectively enhanced.
基金support from the NSFC (Nos. 21571089, 21503102, 51571125)the Fundamental Research Funds for the Central Universities (lzujbky-2016-k02, lzujbky-2018-k08 and lzujbky-2017-it42)+1 种基金Shanghai Pujiang Program (15PJ1400500)Shanghai “Chen Guang” project (14CG02)
文摘Achieving high activity and stability oxygen evolution reaction(OER) catalysts to optimize the efficiency of metal-air battery, water splitting and other energy conversion devices, remains a formidable challenge.Herein, we demonstrate the metallic porous nanowires arrays with abundant defects via nitrogen and copper codoped CoS1.97 nanowires(N-CuCoS1.97 NWs). The N-CuCoS1.97 NWs can serve as an excellent OER self-supported electrode with an overpotential of 280 mV(j = 10 m A cm-2) and remarkable long-term stability. The X-ray absorption near-edge structure(XANES) and X-ray photoelectron spectrum(XPS) measurements confirmed the surface lattice oxygen created on the N-CuCoS1.97 NWs during OER. Then, the density function theory(DFT) results evident that lattice oxygen constructed surface of N-CuCoS1.97 NWs has more favorable OER energetic profiles and absorption for reaction intermediate. More importantly,the flexible and wearable Zn-air battery fabricated by the N-CuCoS1.97 NWs shows excellent rechargeable and mechanical stability, which can be used in portable mobile device.
文摘On November 27^(th),2024,the Center for Excellence in Brain Science and Intelligence Technology(Institute of Neuroscience,ION)at the Chinese Academy of Sciences(CAS)will commemorate its 25th Anniversary by reviewing its development and highlighting its research achievements.Aligned with the anniversary celebrations,Neuroscience Bulletin organized this special academic issue as part of these festivities.This issue features curated and invited submissions from neuroscientists who are currently affiliated with or have previously studied or worked at the ION.The selected papers showcase the institute’s scientific achievements and academic impact,honoring its legacy while inspiring future advancements in the field of neuroscience.Eight Original Articles,four Letters,one Insight,and three Reviews are included.These contributions span multiple dimensions of neuroscience,from molecular mechanisms to cognitive and behavioral insights,each offering a unique perspective on the complexities of the brain.
基金supported by the National Natural Science Foundation of China(No.22172036)the Fundamental Research Funds for the Central Universities(No.20720220011).
文摘Stable oxygen evolution reaction(OER)catalyst alternatives to the precious IrO_(2) catalysts are of great importance to the next-generation proton-exchange membrane(PEM)electrolyzers.RuO_(2)-based materials are promising candidates but suffer from low stability under highly anodic potentials.Here,we reported a facet-selective etching strategy to improve the stability of polycrystalline RuO_(2) without significantly affecting the activity.The selective etching was enabled by the specific chemisorption of pyridazine(pyd)with contingent N atoms onto the RuO_(2) surface.The pyd-RuO_(2) catalyst,after etching,exhibited a low overpotential 247 mV at 100 mA·cm^(-2) and obvious stability improvement of over 200 h at 100 mA·cm^(-2) with only 0.63% Ru loss in acidic conditions.Combining various characterization techniques and theoretical calculations,we revealed that the crystalline RuO_(2)(110)facet is favorably etched by the coordination of pyridazine while protecting other surfaces,which significantly enriches the RuO_(2)(110)facets toward higher OER stability via the dynamic dissolution and repair mechanism in the ordered manner.This study offers alternative perspectives on the dissolution and stability mechanism of RuO_(2) and the facet-selective modulation of nanocrystals by ligand-driven etching.
基金supported by Shanghai Pujiang Program(21PJ1400400)Shanghai Municipal Science and Technology Commission(22511103900)+1 种基金the Fundamental Research Funds for the Central Universities(2232023A-02)the National Natural Science Foundation of China(22173017).
