An atomic-oxygen beam source with compact ECR plasma was successfully investigated. The microwave was produced and transmitted in a coaxial mode, and coupled with the loop. The plasma was produced at a higher asymmetr...An atomic-oxygen beam source with compact ECR plasma was successfully investigated. The microwave was produced and transmitted in a coaxial mode, and coupled with the loop. The plasma was produced at a higher asymmetry magnetic mirror field, and neutralized with the molybdenum target at a lower asymmetry magnetic mirror field. The magnetic field was constituted with permanent magnets. This source has a higher flux density of atom beam, a lower operating pressure, a smaller power consumption and low-cost. When it was installed at the equipment to study the interaction of the beam with the surface, the operation was carried out very easily and with a good stability.展开更多
Hard carbons(HCs)are commercial anode materials for sodium-ion batteries(SIBs),yet their electrochemical performance remains limited by intrinsic structural deficiencies and insufficient Na+storage kinetics.Herein,we ...Hard carbons(HCs)are commercial anode materials for sodium-ion batteries(SIBs),yet their electrochemical performance remains limited by intrinsic structural deficiencies and insufficient Na+storage kinetics.Herein,we report oxygen manipulation in hard carbon,enabled by plasma and laser beam,for improved Na^(+)storage.Starting with commercial HC electrodes,oxygen atoms were first implanted into carbon layers via atmospheric plasma treatment under controlled oxygen partial pressure.Subsequent laser irradiation induced localized thermal shocks that selectively remove oxygen atoms from edge sites,triggering transient carbon lattice rearrangement to simultaneously generate intrinsic defects and optimally sized closed nanopores(1.2-2.0 nm).This dual-stage regulation yielded HC anodes with exceptional Na^(+)storage properties,achieving a high reversible capacity of 335 mAh·g^(-1)at 30 mA·g^(-1)(with 36% enhancement compared with pristine HC)and enhanced Na+diffusion.Through in situ Raman and correlated ex situ spectroscopy analyses(electron paramagnetic resonance(EPR)and X-ray photoelectron spectroscopy(XPS)),we systematically decode the multiscale Na^(+)storage mechanism involving defect adsorption,interlayer intercalation,and nanopore filling.The proposed methodology bridges atomic-scale structural engineering with macroscopic electrode performance optimization,offering a scalable green manufacturing pathway for next-generation SIBs.展开更多
基金This work was supported by the National Natural Science Foundation of China No.19835030.
文摘An atomic-oxygen beam source with compact ECR plasma was successfully investigated. The microwave was produced and transmitted in a coaxial mode, and coupled with the loop. The plasma was produced at a higher asymmetry magnetic mirror field, and neutralized with the molybdenum target at a lower asymmetry magnetic mirror field. The magnetic field was constituted with permanent magnets. This source has a higher flux density of atom beam, a lower operating pressure, a smaller power consumption and low-cost. When it was installed at the equipment to study the interaction of the beam with the surface, the operation was carried out very easily and with a good stability.
基金financially supported by the National Key Research and Development Program of China(No.2023YFB4203702)the National Natural Science Foundation of China(Nos.22179145,22005341,and 22309206)+4 种基金Shandong Provincial Natural Science Foundation(No.ZR2020QB128)Taishan Scholars Program of Shandong Province(No.tsqn20221117)Shandong Provincial Excellent Young Scientists Fund Program(Overseas)(No.2024HWYQ-047)Qingdao Natural Science Foundation(Nos.24-8-4-zrjj-jch and 23-2-1-24-zyyd-jch)Science and Technology Park Incubation Program Project of Qingdao City(No.25-1-1-yqpy-33-qy).
文摘Hard carbons(HCs)are commercial anode materials for sodium-ion batteries(SIBs),yet their electrochemical performance remains limited by intrinsic structural deficiencies and insufficient Na+storage kinetics.Herein,we report oxygen manipulation in hard carbon,enabled by plasma and laser beam,for improved Na^(+)storage.Starting with commercial HC electrodes,oxygen atoms were first implanted into carbon layers via atmospheric plasma treatment under controlled oxygen partial pressure.Subsequent laser irradiation induced localized thermal shocks that selectively remove oxygen atoms from edge sites,triggering transient carbon lattice rearrangement to simultaneously generate intrinsic defects and optimally sized closed nanopores(1.2-2.0 nm).This dual-stage regulation yielded HC anodes with exceptional Na^(+)storage properties,achieving a high reversible capacity of 335 mAh·g^(-1)at 30 mA·g^(-1)(with 36% enhancement compared with pristine HC)and enhanced Na+diffusion.Through in situ Raman and correlated ex situ spectroscopy analyses(electron paramagnetic resonance(EPR)and X-ray photoelectron spectroscopy(XPS)),we systematically decode the multiscale Na^(+)storage mechanism involving defect adsorption,interlayer intercalation,and nanopore filling.The proposed methodology bridges atomic-scale structural engineering with macroscopic electrode performance optimization,offering a scalable green manufacturing pathway for next-generation SIBs.
