Cobalt sulfide@reduced graphene oxide nanocomposites obtained through a dipping and hydrothermal process, exhibit ascendant lithium-ion storage properties.

In the present research, we successfully prepared a series of graphene oxide (GO)/biodegradable poly(ethylene adipate) (PEA) nanocomposites through a simple solution and precipitation process. The scanning electron microscopy observation revealed a fine dispersion of GO with layered structure throughout the PEA matrix.The crystal structure, nonisothermal melt crystallization behavior, overall isothermal melt crystallization kinetics, spherulitic morphology, and spherulitic growth rate of the PEA/GO nanocomposites were investigated in detail and compared with those of neat PEA. Induced by the heterogeneous nucleation of GO, the crystallization processes of the nanocomposites were enhanced, when the samples were nonisothermally crystallized at a cooling rate of 5 o C/min or isothermally crystallized at crystallization temperature values ranging from 32 to 40 o C; however, the nanocomposites and neat PEA exhibited the same crystallization mechanism and crystal structure. Within the investigated temperature range of 24 to 32 o C, the banded spherulites morphologies were observed for neat PEA and its nanocomposites; moreover, it was interesting to find that GO not only enhanced the nucleation density as a nucleating agent but also increased the spherulitic growth rate of the nanocomposites by exhibiting a superstructure templating effect.

Nitrogen-doping treatments using cyanamide as a nitrogen source have been done for several kinds of singlewalled carbon nanotubes (SWCNTs). For SWCNT samples produced by chemical vapor deposition, N 1s X-ray photoelectron spectroscopy peaks can be observed, and the atomic nitrogen doping percentage is estimated to be 1.8 at.%. It was found that the electric double-layer capacitance of the nitrogen-doped SWCNT sample is much larger than that of the pristine sample. Furthermore, the doped sample shows a better rate performance due to its smaller electric resistance. It should also be noted that the capacitance of the nitrogen-doped SWCNTs increases with charge-discharge cycles. This unusual increase is discussed based on the results of XPS, Raman, and cyclic voltammogram measurement results.

The field of small molecule electro-activated conversion is becoming a new star in modern catalytic research toward the carbon-neutral future. The advent of single-atom catalysts (SACs) is expected to greatly...