The shear property of the thermoelectric material Bi2Te3 is inextricably linked with its layer structure. By the molecular dynamics method, the mechanism of shearing deformation was studied in this paper. In the simul...
详细信息
The shear property of the thermoelectric material Bi2Te3 is inextricably linked with its layer structure. By the molecular dynamics method, the mechanism of shearing deformation was studied in this paper. In the simulation,cubic single-crystal simulation cells with different layer directions inside were adopted, ensuring that the caxis of crystal lattice can be along, across and 45o deviated from the shear stress. Compared with all the calculation models, the results show that when the shear stress increases, slip occurs along the Te1-Te1 adjacent layers which are connected by the weak van der Waals bonding, and ultimately leads to structural fracture. Furthermore, size effect and loading modes can also impact the behavior of shearing deformation, however, in very different ways. Future efforts should be focused on the influence of the creation and motion of defectsduring the deformation as well as temperature effect and strain rate effect.
Mechanical stability is of vital significance in commercial application of thermoelectric *** essential mechanical behaviours of a nanoporous skutterudite thermoelectric material have been studied by the molecular dyn...
详细信息
Mechanical stability is of vital significance in commercial application of thermoelectric *** essential mechanical behaviours of a nanoporous skutterudite thermoelectric material have been studied by the molecular dynamics method. The research results reveal that the nanoporous skutterudite is a typical non-linear elastic brittle material, and that the existence of nanopores can remarkably reduce the mechanical properties of the skutterudite. Further research results reveal that the elastic modulus of the nanoporous skutterudite decreases with the growing porosity, and the relationship between the elastic modulus and the porosity can be summarised by an inversely proportional scaling law. The ultimate stress reduces gradually with the decreasing inner nanopore spacing. The fracture strain first decreases and then levels off, which can be attributed to the interplay between the increased porosity and the reduced inner nanopore spacing.
Highly ordered and periodic mesoporous Nafion membranes with controlled structural symmetries including 2D hexagonal (2D-H),3D face-centered (3D-FC),3D cubic-bicontinuous (3D-CB) and 3D body-centered (3D-BC) have been...
Highly ordered and periodic mesoporous Nafion membranes with controlled structural symmetries including 2D hexagonal (2D-H),3D face-centered (3D-FC),3D cubic-bicontinuous (3D-CB) and 3D body-centered (3D-BC) have been successfully synthesized by a novel silica colloidal mediated self-assembly *** them,2D-H and 3D-CB structured Nafion possesses the highest proton conductivities,reaching 0.051 S cm-1,4 times better than 0.013 S cm-1 of pristine Nafion 112 under conditions of 40%RH and *** present study demonstrates that silica colloidal mediated self-assembly is a powerful technique to fabricate Nafion proton exchange membranes with highly ordered and controlled structural symmetries especially for fuel cells operated in low humidity conditions.
Rare earth metal oxides（REMO） as cathode electrocatalysts in direct borohydride fuel cell（DBFC） were *** REMO electrocatalysts tested showed favorable activity to the oxygen electro-reduction reaction and strong t...
详细信息
Rare earth metal oxides（REMO） as cathode electrocatalysts in direct borohydride fuel cell（DBFC） were *** REMO electrocatalysts tested showed favorable activity to the oxygen electro-reduction reaction and strong tolerance to the attack of BH 4-in alkaline *** simple membraneless DBFCs using REMO as cathode electrocatalyst and using hydrogen storage alloy as anodic electrocatalyst exhibited an open circuit of about 1 V and peak power of above 60 mW/cm *** DBFC using Sm 2 O 3 as cathode electrocatalyst showed a relatively better *** maximal power density of 76.2 mW/cm 2 was obtained at the cell voltage of 0.52 V.
Stainless steels are the promising candidate materials for bipolar plate of polymer electrolyte membrane fuel cell (PEMFC) due to their high conductivity,low material and production costs,ease stamping manufacture and...
详细信息
Stainless steels are the promising candidate materials for bipolar plate of polymer electrolyte membrane fuel cell (PEMFC) due to their high conductivity,low material and production costs,ease stamping manufacture and superior mechanical ***,their interfacial contact resistances (ICR) are high and corrosion resistances are not at desired levels for real PEMFC working conditions.
Ordered rutile TiO2 nanorods grown on transparent electro-conductive F-doped SnO2-coated (FTO) glass substrates were prepared by a simple hydrothermal method using tetrabutyl titanate as the precursor and then calcine...
详细信息
暂无评论