Huiying Wei

One-step synthesis of Ni-doped SnO2 nanospheres with enhanced lithium ion storage performance

In our work, Ni-doped SnO2 nanospheres have been synthesized via a one-step hydrothermal method using glucose as the soft template. Their structure and physicochemical properties were investigated using X-ray diffraction (XRD), a transmission electron microscope (TEM), a field-emission scanning electron microscope (FE-SEM) equipped with energy-dispersive X-ray spectroscopy (EDS), high resolution transmission electron microscopy (HRTEM) and electrochemical methods. Compared with the pristine SnO2, appropriate Ni-doped SnO2 nanospheres showed much better rate capability and excellent cycling performance. In particular, the sample with 5 mol% Ni showed a high initial reversible capacity of 1267 mA h g−1 at a charge–discharge rate of 0.2 C, and a stable reversible capacity of 674.8 mA h g−1 after 35 cycles. Nickel doping could accommodate the huge volume expansion and avoid the agglomeration of nanoparticles. Thus, the electrochemistry performance was significantly improved.

Expression of c-kit Protein and Mutational Status of the c-kit Gene in Osteosarcoma and Their Clinicopathological Significance

We examined c-kit protein expression and mutations of the c-kit gene in 40 human osteosarcoma samples to their relationship with clinicopathology and prognosis of the disease. The expression of c-kit protein was evaluated by immunohistochemistry and single-strand conformational polymorphism was performed to evaluate c-kit gene mutations in exons 11 and 17. Expression of c-kit protein occurred in 25 (62.5%) osteosarcoma samples. Patients with osteosarcomas with higher c-kit protein expression levels were significantly more likely to experience local disease recurrence and had a significantly lower survival time than patients with lower c-kit expression. We found no evidence of mutations in exons 11 or 17. This study suggests that c-kit protein expression might serve as a prognostic marker for osteosarcoma, however exons 11 and 17 might not be suitable targets for osteosarcoma treatments based on suppression of c-kit tyrosine kinase activity.

A simple and practical synthesis route for preparation of Li3V2(PO4)3/C by the rheological phase method using composite chelating reagents

Carbon-coated Li3V2(PO4)3 composite material has been successfully synthesized by a simple and practical rheological phase method using composite chelating reagents of citric acid and glycine. The as-prepared Li3V2(PO4)3/C composite material shows stable cycle performance, capacity retention and thermostability.

Hierarchical polymorphic MnCO3 series induced by cobalt doping via a one-pot hydrothermal route for CO catalytic oxidation

In this study, a series of cobalt-doped MnCO3 hierarchical microstructures with different morphologies were synthesized by tuning a single variable (the dopant content) via a one-step, mild solvothermal synthesis in a N,N-dimethylformamide (DMF) solution system. Structure evolution of the polymorphic MnCO3 took place with the morphology obviously transforming from an initial flower-microstructure to fan-like, then to hedgehog-like hemispheres and finally to flake-spheres as the Co2+ theoretical content (Co/(Co + Mn)) increased from 0 to 20% in the solvothermal process. Cobalt ion modulated reaction-limited aggregation (RLA) is proposed in the growth mechanism. The mechanism of Co2+-induced acceleration and full growth is further investigated. The Co2+ doped manganese carbonate displays wonderful catalytic performance towards CO oxidation.

Solvothermal synthesis of 1D nanostructured Mn2O3: effect of Ni2+ and Co2+ substitution on the catalytic activity of nanowires

In this paper, cation modified one dimensional Mn2O3 nanowires were synthesized via a solvothermal synthesis and calcination free from the template-assisted method. The samples were characterized in detail by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS). XRD results revealed the homogeneity of Ni–Mn–O/Co–Mn–O solid solutions. By introducing the two different cations the Mn2O3 nanowires can be freely manipulated. The H2-TPR measurement showed the enhanced reduction behaviors of the doped manganese oxide (Mn2O3) samples. The presence of Ni2+ and Co2+ produced lattice defects and promoted the production of oxygen vacancies, which explained the results that Ni2+/Co2+ doped Mn2O3 showed higher catalytic activity than the pure sample.

The effect of copper species in copper-ceria catalysts: structure evolution and enhanced performance in CO oxidation

In this paper, copper doped ceria porous nanospheres were synthesized using carbon nanospheres as a hard template via a homogenous precipitation method at low temperature. The results showed that the copper-doped ceria has undergone a morphology transformation from the initial double-shell spheres to hollow spheres as the copper doping concentration increased from 0 to 7.5%mol. Notably, the Cu/Ce + Cu atomic ratio in the final products was approximately five times the initial design ratio, which confirmed an efficient utilization of copper in this system. Furthermore, the copper-ceria catalysts exhibited enhanced catalytic performance towards CO conversion when compared with pure ceria catalysts (e.g., for the optimal catalysts, the complete conversion temperature was 160 °C, for the pure catalysts, complete conversion temperature was 300 °C). Through the analysis of the catalysts structure, we proved that the superior catalytic performance was derived from a combination of CuOx clusters and copper ions in the Cu–[Ox]–Ce bulk phase.

Poly-assisted template-free synthesis of novel double-shelled Co3O4 yolk–shell submicrospheres with excellent electrochemical properties

Novel double-shelled Co3O4 yolk–shell submicrospheres were successfully synthesized via a poly-assisted template-free solvothermal method and a subsequent high heat-treatment process. Before being calcined, the obtained solid spheres were amorphous and the surfaces of the precursors were smooth. The morphology and phase of the products were characterized using several physical analysis techniques, including powder X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). The LAND cell test system revealed the electrochemical properties of the final products. The as-prepared double-shelled yolk–shell submicrospheres showed a remarkable initial specific discharge capacity of about 1634 mA h g−1. From the 2nd cycle to the 70th cycle, the specific discharge capacity of the double-shelled yolk–shell submicrospheres varied from 1283.2 to 1091 mA h g−1 with a retention rate of around 85.03%, corresponding to a fading rate of 2.17% per cycle. Moreover, a possible growth mechanism of the yolk–shell spheres from the solid spheres precursor was also proposed.