With the development of spintronics,the investigation on the behavior of oxygen in two-dimensional materials has never ceased.On account of its lively nature,oxygen is hard to exist alone in the system.However,it will...With the development of spintronics,the investigation on the behavior of oxygen in two-dimensional materials has never ceased.On account of its lively nature,oxygen is hard to exist alone in the system.However,it will interact with other atoms and produce complex orbital hybridization effect,which has influenced the performance of the material.Especially for materials in nanoscale,it is inevitable to introduce the oxygen atoms,no matter what in the process of preparation or employ.Therefore,it is necessary to carry on the research about the effect of oxygen behaviors in the two-dimensional thin films.In this paper,it will mainly introduce the effect of oxygen behaviors on the magnetic properties,electrical properties,phase transition,spin-dependent properties and thermal stability,summarize several factors which influence the oxygen behaviors,and generalize the research progress of the mechanism behind the oxygen behaviors.展开更多
The anodic layer and oxygen evolution behavior of Pb-Ag-Nd alloy during pulse current polarization and constant current polarization in 160 g/L H2SO4 solution was comparatively investigated by chronopotentiometry, SEM...The anodic layer and oxygen evolution behavior of Pb-Ag-Nd alloy during pulse current polarization and constant current polarization in 160 g/L H2SO4 solution was comparatively investigated by chronopotentiometry, SEM, XRD, EIS and Tafel techniques. The results show that the anodic layer on Pb-Ag-Nd alloy formed through pulse current polarization is more intact and presents fewer micro-holes than that formed through constant current polarization. This could be attributed to the low current density period, which works as a ‘recovery period＇. During this period, the oxygen evolution reaction is less intense, which benefits the recovery of porous anodic layer. Pb-Ag-Nd anode also shows a lower anodic potential during pulse current polarization, which is in accordance with its smaller charge transfer resistance and smaller Tafel slope coefficient at high over-potential region. The lower anodic potential could be ascribed to the higher concentration of Pb O2 in the anodic layer, which promotes the formation of more reactive sites for the oxygen evolution reaction.展开更多
基金financially supported by the National Key Scientific Research Projects of China(No.2015CB921502)the National Natural Science Foundation of China(Nos.51331002,51371027 and 51571017)
文摘With the development of spintronics,the investigation on the behavior of oxygen in two-dimensional materials has never ceased.On account of its lively nature,oxygen is hard to exist alone in the system.However,it will interact with other atoms and produce complex orbital hybridization effect,which has influenced the performance of the material.Especially for materials in nanoscale,it is inevitable to introduce the oxygen atoms,no matter what in the process of preparation or employ.Therefore,it is necessary to carry on the research about the effect of oxygen behaviors in the two-dimensional thin films.In this paper,it will mainly introduce the effect of oxygen behaviors on the magnetic properties,electrical properties,phase transition,spin-dependent properties and thermal stability,summarize several factors which influence the oxygen behaviors,and generalize the research progress of the mechanism behind the oxygen behaviors.
基金Projects(51204208,51374240)supported by the National Natural Science Foundation of ChinaProject(2012BAA03B04)supported by the National Science and Technology Pillar Program of ChinaProject(2014zzts028)supported by the Fundamental Research Funds for the Central Universities of Central South University,China
文摘The anodic layer and oxygen evolution behavior of Pb-Ag-Nd alloy during pulse current polarization and constant current polarization in 160 g/L H2SO4 solution was comparatively investigated by chronopotentiometry, SEM, XRD, EIS and Tafel techniques. The results show that the anodic layer on Pb-Ag-Nd alloy formed through pulse current polarization is more intact and presents fewer micro-holes than that formed through constant current polarization. This could be attributed to the low current density period, which works as a ‘recovery period＇. During this period, the oxygen evolution reaction is less intense, which benefits the recovery of porous anodic layer. Pb-Ag-Nd anode also shows a lower anodic potential during pulse current polarization, which is in accordance with its smaller charge transfer resistance and smaller Tafel slope coefficient at high over-potential region. The lower anodic potential could be ascribed to the higher concentration of Pb O2 in the anodic layer, which promotes the formation of more reactive sites for the oxygen evolution reaction.
