A simple hydrothermal process employing sucrose and glutathione as the source of carbon and nitrogen-sulfur, respectively, a porous carbon/sulfur composite material doped with nitrogen and sulfur (NSPCS) was synthesized. The detailed structure information of the material was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The morphology information was investigated through Scanning Electron Microscope (SEM) methods. Structure of the pores and pore size distribution were investigated employing N2 adsorption-desorption isotherm. The material was treated Thermogravimetric analysis (TGA) in order to know the weight ratio of sulfur. The synthesized NSPCS composite produced high specific capacity, excellent rate performance and exceptionally good cycle stability when used as the positive electrode in Li-S batteries.
A composite of MoS2/MMNC (micro‐mesopores nitrogen‐doped carbon) was prepared through a simple hydrothermal method and utilized as a host for Li−S battery. The crystal structure of MoS2/MMNC−S composite were tested by X‐ray diffraction (XRD), Raman Spectroscopy and X‐ray photoelectron spectroscopy (XPS). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to characterize its morphology. The pore size distribution and weight ratio of sulfur were measured via N2 adsorption‐desorption isotherm and thermogravimetric analysis (TGA), respectively. MoS2/MMNC−S composite showed a good electrochemical performance as the positive electrode for Li−S battery. The rate performance of the battery is ideal and the capacity retention is maintained at ∼ 90% after 200 cycles at 0.5 C.
Nowadays, energy and environmental crisis are the great problems for all the countries in the world. With outstanding virtues, including non-pollution and inexhaustible supply, solar light is considered as one of the most promising candidate to resolve the energy crisis and environmental problems. However, low energy conversion efficiency still restricts its practical application. Recently, a metal-free visible-light photocatalyst graphitic carbon nitride (g-C 3 N 4) has attracted intensive interest for its many promising applications. The g-C 3 N 4 has a moderate band gap (2.7 eV), high chemical and thermal stability as well as fascinating electronic property. However, the rapid photogenerated electron-hole pair recombination leads to the low activity in practical applications 1,2. Several routes have been developed to solve this problem 3-6 , preparation of porous 7 g-C 3 N 4 , protonating by strong acids 8 and designing composite with other semiconductors 9. Among those strategies, doping is one of the most convenient and effective method. Yan et al. 3 prepared B doped g-C 3 N 4 and suggested that the enhanced degradation performance of Rhodamine-B was due to the improvement of dye adsorption and light absorption ability. Zhang et al. 4 synthesized phosphorus doped g-C 3 N 4 using ionic liquid [Bmim]PF 6 as phosphorus source. The obtained material exhibited significantly improved electrical conductivity and photocurrent. Noble metal, such as Pt, Pd and Ag, is an effective dopant to trap the
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