RESUMEN
Constructing bimetallic sulfide components are considered to be a promising and efficient lithium storage materials. Nonetheless, preparation routes of rational structures that have abundant hierarchical interfaces or phase boundaries bimetallic sulfide are still a problem to over come. In this work, a novel hierarchical nanostructure of bimetal sulfide CoS-MoS2 nanorods are synthesized successfully by in-situ self-growth means at the hydrothermal conditions. Subsequently, we loaded it to the carbon matrix (CoS-MoS2@rGO) forming a three-dimensional structures with the help of freeze drying technology. This well-designed hierarchical structure could created a stable heterogeneous contact surface, which guarantees rapid Li+ ions diffusion and facilitates charge transfer at the heterointerface. Which can maintain capacity of 776 mAh/g over 800 cycles at 1 A/g. On the other hand, it shows an excellent rate capability of 464 mAg h-1 at 5 A/g. From the perspective of electrochemical kinetics, we analyze and explore the reason about the improved lithium storage performance. Furthermore, to insight into the relationship between matter and phase conversion, the in-situ X-ray diffraction characterization is executed. The strategy of rationally designing hierarchical heterostructures will shed light on outstanding electrochemical performance in energy storage applications.
RESUMEN
A class of 2D layered materials exhibits substantial potential for high-performance electrocatalysts due to high specific surface area, tunable electronic properties, and open 2D channels for fast ion transport. However, liquid-phase exfoliation always utilizes organic solvents that are harmful to the environment, and the active sites are limited to edge sites. Here, an environmentally friendly exfoliator in aqueous solution is presented without utilizing any toxic or hazardous substance and active site self-assembly on the inert base of 2D materials. Benefiting from thin 2D/2D heterostructure and strong interfacial coupling, the resultant highly disordered amorphous NiFe/2D materials (Ti3C2 MXene, graphene and MoS2 ) thin nanosheets exhibit extraordinary electrocatalytic performance toward oxygen evolution reaction (OER) in alkaline media. DFT results further verify the experimental results. The study emphasizes a viable idea to probe efficient electrocatalysts by means of the synergistic effect of environmentally friendly exfoliator in aqueous solution and active site self-assembly on the inert base of 2D materials which forms the unique thin 2D/2D heterostructure in-suit. This new type of heterostructure opens up a novel avenue for the rational design of highly efficient 2D materials for electrocatalysis.
RESUMEN
To investigate the influence of G-CSF mobilization on functions of donor T lymphocyte subpopulation and acute graft-versus-host disease, peripheral blood samples of 20 healthy donors were collected before and after G-CSF mobilization. The whole blood was diluted with IMDM in ratio of 1:1 and then incubated with PMA + ionomycin + monensin at 37 degrees C, 5% CO2 for 4 hours. After being mobilized and stained, the IL-4, IFN-gamma and IL-2 positive cells were counted with three-color flow cytometry. The results showed that before G-CSF mobilization, the percentages of donor's CD3(+)IFN-gamma(+), CD4(+)IFN-gamma(+), CD8(+)IFN-gamma(+) T cells were 3.2% (0% - 45.9%), 1.3% (0% - 23.8%) and 1.5% (0% - 22.2%) respectively. The percentage of above mentioned cells in donor increased to 19.2% (0% - 53.9%), 9.5% (0% - 49.5%), 7.5% (0% - 38.1%) respectively after G-CSF mobilization. The IL-2 positive CD3(+), CD4(+) and CD8(+) T cell percentage in pre-G-CSF mobilized donors was 1.5% (0% - 31%), 0.8% (0% - 30.0%) and 0% (0% - 5.3%) respectively and subsequently increased to 25.7% (0% - 51%), 19.8% (0% - 39.7%), 4.6% (0% - 20.9%) respectively after G-CSF mobilization. The IL-4 positive T subpopulation did not increased significantly after G-CSF mobilization. In the early stage after peripheral blood stem cell transplantation, donor's Tc1 percentage in aGVHD group was significantly higher than that in non-aGVHD group. The morbidity of severe aGVHD in high Tc2 percentage group was significantly lower than that in low Tc2 percentage group. It is concluded that the donor's type I T cells increase after G-CSF mobilization, the Tc1 percentage of G-CSF mobilized donor is correlated with the occurrence of aGVHD in the early stage after HSCT, the percentage of Tc2 in donor is negatively correlated with aGVHD morbidity in recipients.
