The hydrogen storage behavior of the TiCr2 and ZrCr2 alloys substituted with the third components (Zr, V, Fe, Ni) have been studied using first-principles calculations. The change of the hydrogen absorption energies...The hydrogen storage behavior of the TiCr2 and ZrCr2 alloys substituted with the third components (Zr, V, Fe, Ni) have been studied using first-principles calculations. The change of the hydrogen absorption energies caused by metal doping is arising from the charge transfer among the doped alloys interior. Zr and V atoms devoted abundant electrons, leading to a great enhancement of the H absorption energy, while Fe and Ni atoms always accepted electrons, yielding a remarkable decrease of the H absorption energy. The hydrogen diffusion energy barrier is closely correlated with the geometry effect rather than the electronic structure.展开更多
Vanadium alloys are the promising first wall and blanket materials for fusion reactors.Large amounts of helium(He)and hydrogen(H)impurities are produced inside the materials along with irradiation defects under neutro...Vanadium alloys are the promising first wall and blanket materials for fusion reactors.Large amounts of helium(He)and hydrogen(H)impurities are produced inside the materials along with irradiation defects under neutron irradiation,leading to bubble formation and microstructure changes,which will degrade the thermal and mechanical properties of vanadium alloys.The microstructure changes of materials are influenced by the interactions of point defects with solute atoms.Nowadays,first-principles calculations are intensively performed to elucidate these interactions,clustering,and dissolution,which can provide valuable information for the design of high-performance anti-irradiation materials.This paper reviews the recent findings of the interactions of point defects(vacancies,self-interstitial atoms)with substitutional solutes and interstitial solutes(C,O,N,H,and He)as well as their clusters in vanadium and its alloys from first-principles calculations.展开更多
Graphene oxide(GO),the functionalized graphene with oxygenated groups(mainly epoxy and hydroxyl),has attracted resurgent interests in the past decade owing to its large surface area,superior physical and chemical prop...Graphene oxide(GO),the functionalized graphene with oxygenated groups(mainly epoxy and hydroxyl),has attracted resurgent interests in the past decade owing to its large surface area,superior physical and chemical properties,and easy composition with other materials via surface functional groups.Usually,GO is used as an important raw material for mass production of graphene via reduction.However,under different conditions,the coverage,types,and arrangements of oxygen-containing groups in GO can be varied,which give rise to excellent and controllable physical properties,such as tunable electronic and mechanical properties depending closely on oxidation degree,suppressed thermal conductivity,optical transparency and fluorescence,and nonlinear optical properties.Based on these outstanding properties,many electronic,optical,optoelectronic,and thermoelectric devices with high performance can be achieved on the basis of GO.Here we present a comprehensive review on recent progress of GO,focusing on the atomic structures,fundamental physical properties,and related device applications,including transparent and flexible conductors,field-effect transistors,electrical and optical sensors,fluorescence quenchers,optical limiters and absorbers,surface enhanced Raman scattering detectors,solar cells,light-emitting diodes,and thermal rectifiers.展开更多
基金Acknowledgements The authors gratefully acknowledge the financial supports for this work from the Central Universities of China (No. DUT10ZD211), the National Natural Science Foundation of China (Grant Nos. 10774019, 20833009, 20873148, U0734005, 51071146, and 51071081), the National Basic Research Program of China (973 program) (Grant No. 2010CB631303), Dalian Scientific Fund (Grant No. 2009A11GX052), and the State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology (Grant Nos. KFJJ08-5 and KFJJ10-1Z).
文摘The hydrogen storage behavior of the TiCr2 and ZrCr2 alloys substituted with the third components (Zr, V, Fe, Ni) have been studied using first-principles calculations. The change of the hydrogen absorption energies caused by metal doping is arising from the charge transfer among the doped alloys interior. Zr and V atoms devoted abundant electrons, leading to a great enhancement of the H absorption energy, while Fe and Ni atoms always accepted electrons, yielding a remarkable decrease of the H absorption energy. The hydrogen diffusion energy barrier is closely correlated with the geometry effect rather than the electronic structure.
基金financially supported by the National MCF Energy R&D Program of China(Grant Nos.2018YFE0308100,and 2018YFE0308105)the National Key Research and Development Program of China(Grant No.2017YFE0301306)+2 种基金the Liaoning Province Natural Science Fund Project of China(Grant No.20180510053)the Fundamental Research Funds for the Central Universities of China(Grant No.3132020178)the National Natural Science Foundation of China(Grant Nos.11847164 and 11905019)
文摘Vanadium alloys are the promising first wall and blanket materials for fusion reactors.Large amounts of helium(He)and hydrogen(H)impurities are produced inside the materials along with irradiation defects under neutron irradiation,leading to bubble formation and microstructure changes,which will degrade the thermal and mechanical properties of vanadium alloys.The microstructure changes of materials are influenced by the interactions of point defects with solute atoms.Nowadays,first-principles calculations are intensively performed to elucidate these interactions,clustering,and dissolution,which can provide valuable information for the design of high-performance anti-irradiation materials.This paper reviews the recent findings of the interactions of point defects(vacancies,self-interstitial atoms)with substitutional solutes and interstitial solutes(C,O,N,H,and He)as well as their clusters in vanadium and its alloys from first-principles calculations.
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.11604039,11974068,and 11504040)the Fundamental Research Funds for the Central Universities of China(Grant Nos.DUT18LK07,DUT16RC(4)66,and DUT17RC(4)52)the Supercomputing Center of Dalian University of Technology。
文摘Graphene oxide(GO),the functionalized graphene with oxygenated groups(mainly epoxy and hydroxyl),has attracted resurgent interests in the past decade owing to its large surface area,superior physical and chemical properties,and easy composition with other materials via surface functional groups.Usually,GO is used as an important raw material for mass production of graphene via reduction.However,under different conditions,the coverage,types,and arrangements of oxygen-containing groups in GO can be varied,which give rise to excellent and controllable physical properties,such as tunable electronic and mechanical properties depending closely on oxidation degree,suppressed thermal conductivity,optical transparency and fluorescence,and nonlinear optical properties.Based on these outstanding properties,many electronic,optical,optoelectronic,and thermoelectric devices with high performance can be achieved on the basis of GO.Here we present a comprehensive review on recent progress of GO,focusing on the atomic structures,fundamental physical properties,and related device applications,including transparent and flexible conductors,field-effect transistors,electrical and optical sensors,fluorescence quenchers,optical limiters and absorbers,surface enhanced Raman scattering detectors,solar cells,light-emitting diodes,and thermal rectifiers.