General synthesis and electrochemical performance of TiO2-based microspheres with core-shell structure

Hierarchical nanosheet-constructed yolk–shell TiO2 porous microspheres for lithium batteries with high capacity, superior rate and long cycle capability

“…Indeed, the yolk-shell configuration may improve structural stability, volumetric specific capacity and energy density, enabling the TiO 2 anode material with superior lithium storage performance. 28,[32][33][34] Yang et al employed a strategy of combining template assisted growth with solvothermal alcoholysis to synthesize core-void-shell anatase TiO 2 nanoparticle aggregates with 177 mA h g −1 reversible capacity after 50 discharge-charge cycles at 1 C. 34 Yoon et al synthesized pseudoyolk-shell mesoporous TiO 2 spheres by a hydrothermal reaction without a surfactant, which exhibited a similar capacity of 180 mA h g −1 for 10 cycles at 1 C. 28 However, both the above TiO 2 yolk-shell structures demonstrated short cycle numbers at high current rates. This is due to the non-uniform size and voids in the core-void-shell structure, poor monodispersity and the fragile shell constructed by aggregated nanoparticles, which cannot make full use of the merits of the yolk-shell structure.…”

Binder free three-dimensional sulphur/few-layer graphene foam cathode with enhanced high-rate capability for rechargeable lithium sulphur batteries

“…It exhibits micro-(< 2 nm), meso-(2-50 nm), and macropores (>50 nm) structure with a rather high proportion of micropores which is known to help improve cycle-life by retaining polysulphides in 70 such pores. 8,31,50,51 As deduced from transmission electron microscope image analysis, the formation of the nanoporous structure could arise from two potential schemes (Fig. 3).…”

One pot microwave-assisted synthesis of Ag decorated yolk@shell structured TiO2 microspheres

“…[1][2][3][4][5] A large number of TiO 2 photocatalysts with various morphologies and structures (such as nanoparticles, nanorods, nanosheets, nanotubes) have been synthesized, [6][7][8][9] among them, yolk@shell structured TiO 2 have attracted special interest due to their unique properties, such as low density, high surface area, good surface permeability and great light-harvesting capacity. [10][11][12][13] It has been reported that yolk@shell structured mesoporous TiO 2 microspheres exhibited considerably high activity in the photocatalytic degradation of phenol, 10 due to the large accessible surface area and excellent light harvesting properties. Over the past few years, huge efforts have been made to fabricate yolk@shell structured TiO 2 .…”

“…Over the past few years, huge efforts have been made to fabricate yolk@shell structured TiO 2 . [10][11][12][13][14][15] For example, Cui et al have reported the fabrication of yolk@shell structured TiO 2 microspheres using linear polymer polyethylene glycol as a template. 14 At the present time, the template route is the most widely used method for materials chemists to synthesize the yolk@shell structured TiO 2 , which need additional steps to remove the templates.…”