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High-performance lithium-ion batteries (LIBs) and sodium-ion battery (SIBs) anode materials Co 3 S 4 –ZnS/NC are prepared by carbonization and subsequent sulfidation using Co, Zn-based zeolitic imidazolate frameworks (ZIF) as a precursor. ZnS and Co 3 S 4 in-situ doping on polyhedral carbon framework, which enhances the conductivity and can buffer the volume expansion during the cycle and improve...
Lithium-sulfur (Li-S) batteries are considered as a promising candidate for large-scale applications such as electrical vehicles (EVs) because of their high theoretical capacity, large energy density and low cost. However, due to the shuttling effect of polysulfides, the continuous capacity fading during cycling remains a substantial bumper for the practical use of Li-S batteries. Here, reduced graphene...
As potential alternatives to lithium-ion batteries in grid energy storage application, sodium-ion batteries (SIBs) have attracted tremendous attention. Absence of high-performance anode material remains a challenge to commercialize SIBs. Herein, a SnSbSx/porous carbon nanofiber (SnSbSx/PCNF) composite with superior performance is successfully prepared via electrospinning, followed by a sulfuration...
We investigate the effects of embedded magnetic atoms on the edge states and spin-dependent transport properties of zigzag 6, 6, 12-graphyne nanoribbon (6, 6, 12-Z GYNRs) using non-equilibrium Greens functions combined with density-function theory. The results show that spin splitting occurs when doping magnetic atoms in the natural “holes” of the 6, 6, 12-Z GYNRs. Particularly, the half-metallicity...
Lithium–sulfur (Li–S) batteries have been considered as a promising candidate for next-generation energy-storage devices due to their high theoretical capacity and energy density. However, the severe self-discharge behavior of Li–S batteries strongly limits their use in practical applications. Here, we report a sustainable and highly porous polyacrylonitrile/graphene oxide (PAN/GO) nanofiber membrane...
Nitrogen-doped carbon nanofibers (N-CNFs) derived from polyacrylonitrile were successfully synthesized by a combination of electrospinning and thermal treatment processes. The as-prepared N-CNFs were used as anode material for sodium-ion batteries due to their unique fabric and weakly-ordered turbostratic structure as well as large spacing between graphene layers. Results show that N-CNFs carbonized...
The ferrocene–porphyrin–single-walled carbon nanotube (Fc–H 2 P–SWCNT) triad hybrid was prepared by amidation reaction between carboxylated SWCNT and aminoporphyrin bearing an appended ferrocenyl substituent. The hybrid described here was fully characterized by a combination of analytical techniques such as Fourier transform infrared spectroscopy, Raman, absorption and emission spectroscopy,...
A horizontally-aligned carbon nanotube (HACNT) field emission cathode was coated with a metallic glass thin film (MGTF) to improve the stability of the field emission properties. HACNT field emission cathodes have previously been fabricated on glass substrates using composite plating and crack-formation techniques. A carbon nanotubes/nickel (CNTs/Ni) composite film is deposited onto a glass substrate...
A new and simple method for in-situ control of the growth direction of carbon nanotubes (CNTs) on cantilevers has been developed using plasma enhanced chemical vapor deposition (PECVD). Plasma-induced surface stresses in PECVD processes tend to cause bending of the cantilevers, which significantly changes the electric field distribution near the free-end of the cantilever. By adjusting the flow ratio...
The electrical resistance of polystyrene sheets containing carbon nanotubes (CNTs) and graphene nanosheets (GNSs) was examined as a function of electric field intensity and annealing temperature. The time needed for the percolation threshold to be reached, decreases with increasing field intensity, annealing temperature and filler loading. However, conductive networks were always formed more easily...
The field emission mechanisms of the ultra small armchair and zigzag single-walled carbon nanotubes with finite and infinite length are studied individually by using the first principle theory. For carbon nanotubes with finite length, the field emission is affected not only by the electronic behaviors related to the magnitude of diameter, but also by the geometrical conditions at the edge of finite...
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