Hollow nanostructure of sea-sponge-C/SiC@SiC/C for stable Li+-storage capability

Abstract

For the purpose of stable performance in energy storage systems, a new hollow nanostructure of seasponge-C/SiC@SiC/C (SCS/SiC@SiC/C) has been successfully fabricated by the SCS/SiC nanospheres coated with SiC/C shells through an in situ reduction process. Based on SCSs and the carbon shells, the stable hollow structures of SCS/SiC@SiC/C can contain large proportion of active SiC layers, which are adhered to both SCSs and the inner surfaces of carbon shells. Such nanostructured anode enables an excellent cycling stability with a capacity of 612 mAh/g at a current density of 0.5 A/g after 1,800 cycles, achieving an excellent stable Li + -storage capability.

Thermal pyrolysis of Si@ZIF-67 into Si@N-doped CNTs towards highly stable lithium storage

“…Various strategies have been proposed to enable the Si-based anodes with improved electrochemical performances [13][14][15][16][17][18][19][20]. Among them, the inclusion of N-doped porous carbon matrix on the surface of Si is the most promising because of the high electronic/ionic conductivity of N-doped porous carbon and the buffering contribution of the porous structure to volume change [21,22].…”

Dual Carbon Design Strategy for Anodes of Sodium-Ion Battery: Mesoporous CoS2/CoO on Open Framework Carbon-Spheres with rGO Encapsulating

“…After OFC@CoS 2 /CoO is capsulated with rGO, the XRD pattern shows a broad peak at ∼21.2°, which is corresponding to the diffraction peak of the (002) plane of graphite . It is well-known that, in the Raman spectra of a carbon material, the D peak (1341 cm –1 , standing for disorder) is the characteristic disordered carbon with structural defects, whereas the G peak (1587 cm –1 , standing for graphite carbon) is associated with graphite carbon. , Their peak strength I D and I G are proportional to the contents of disordered and ordered carbon atoms, respectively. The obtained ratio values of I D / I G for samples of OFC, OFC@CoS 2 /CoO, and OFC@CoS 2 /CoO@rGO are 0.67, 0.98, and 0.92, respectively (Figure b).…”

Nanostructured Ni2SeS on Porous-Carbon Skeletons as Highly Efficient Electrocatalyst for Hydrogen Evolution in Acidic Medium

“…The results clearly indicate that the substrate of PCSs plays an important role to improve the HER performance due to its unique interconnected channels and good conductivity. 38,39 From Figure 4A, the high overpotential of PCS elucidates that there is not catalytic performance from the carbon substrate. The Tafel slope, which is derived from the polarization curve, is commonly used to discern the rate-determining step and the possible HER reaction pathway.…”

“…The porous-C/Ni 2 SeS nanostructure was transformed from porous-C/NiSe 2 based on the PCSs synthesized from our previous works. , In a typical synthetic procedure, 1 mmol of Ni­(NO 3 ) 2 ·6H 2 O and 10 mg of PCSs were added into 20 mL of distilled water at room temperature. The mixture was conducted by ultrasonic treatment until the mixture was uniform and the PCSs were dispersed homogeneously in the solution.…”

“…Based on the above three methods and the good catalytic activity of Ni-based catalysts, − in this study, we designed and developed porous-C/Ni 2 SeS hollow structures with Ni 2 SeS nanostubs (NSs) uniformly anchored onto the porous-carbon skeletons (PCSs) , as the highly effective electrocatalyst for the HER. Such a designed catalyst enables a superior HER performance with a low overpotential, a small Tafel slope, and a long-term stability.…”