Using (Ti(OC_4H_9)_4) and metal chlorates as starting materials, CoFe_2O_4/TiO_2 composite films were pre-pared by sol-gel method. The effects of heat treatment temperature and pH of the precursor on micro-structure a...Using (Ti(OC_4H_9)_4) and metal chlorates as starting materials, CoFe_2O_4/TiO_2 composite films were pre-pared by sol-gel method. The effects of heat treatment temperature and pH of the precursor on micro-structure and magnetic properties were studied. The phase structure of the samples was examined by X-ray diffraction. The microstructure was examined by scanning electron microscope, atomic force microscope and polarized microscope. The magnetic property was measured by vibrating sample magnetometer. The results show that the crystals of different phases grow up independently. CoFe_2O_4 is uniformly embedded into the TiO_2 matrix in the prepared composite films, and the growth of com-posite films is dependent on the heat treatment temperatures and PH of the precursor. The average size of CoFe_2O_4 crystal is 19 nm in Nanocomposite film prepared when the heat treatment temperature is 800℃ and the pH of the precursor is between 2 and 3. The magnetism of the composite films is en-hanced as the heat treatment temperature increases.展开更多
Effectively trapping lithium polysulfide species and accelerating the reaction conversion kinetics are the main strategies to improve the performance of lithium-sulfur(Li-S)batteries.Since the researchers found in 201...Effectively trapping lithium polysulfide species and accelerating the reaction conversion kinetics are the main strategies to improve the performance of lithium-sulfur(Li-S)batteries.Since the researchers found in 2014 that two-dimensional(2D)phosphorene nanosheets could be exfoliated from the bulk black phosphorus,numerous researches have been devoted to exploring the phosphorene with unique properties for the application in Li-S batteries In this review.we summarize the recent theoretical and experimental progress of phosphorene for Li-S batteries.Be-sides,we also introduce the relationship between the interfacial interaction on phosphorene and the performance enhancement of Li-S batteries.Furthermore,future challenges and remaining opportunities for phosphorene in Li-s batteries are finally discussed.展开更多
基金the National Natural Science Foundation of China (Grant Nos.50632030 and 10474077)the Natural Science Foundation of Shaanxi Province (Grant No.2006E135)
文摘Using (Ti(OC_4H_9)_4) and metal chlorates as starting materials, CoFe_2O_4/TiO_2 composite films were pre-pared by sol-gel method. The effects of heat treatment temperature and pH of the precursor on micro-structure and magnetic properties were studied. The phase structure of the samples was examined by X-ray diffraction. The microstructure was examined by scanning electron microscope, atomic force microscope and polarized microscope. The magnetic property was measured by vibrating sample magnetometer. The results show that the crystals of different phases grow up independently. CoFe_2O_4 is uniformly embedded into the TiO_2 matrix in the prepared composite films, and the growth of com-posite films is dependent on the heat treatment temperatures and PH of the precursor. The average size of CoFe_2O_4 crystal is 19 nm in Nanocomposite film prepared when the heat treatment temperature is 800℃ and the pH of the precursor is between 2 and 3. The magnetism of the composite films is en-hanced as the heat treatment temperature increases.
基金Supported by the National Natural Science Foundation of China(No.11722543)the National Key Research and Develop-ment Program of China(No.2017YFA0206703)the Anhui Provincial Natural Science Foundation,China(No.18080850B35).
文摘Effectively trapping lithium polysulfide species and accelerating the reaction conversion kinetics are the main strategies to improve the performance of lithium-sulfur(Li-S)batteries.Since the researchers found in 2014 that two-dimensional(2D)phosphorene nanosheets could be exfoliated from the bulk black phosphorus,numerous researches have been devoted to exploring the phosphorene with unique properties for the application in Li-S batteries In this review.we summarize the recent theoretical and experimental progress of phosphorene for Li-S batteries.Be-sides,we also introduce the relationship between the interfacial interaction on phosphorene and the performance enhancement of Li-S batteries.Furthermore,future challenges and remaining opportunities for phosphorene in Li-s batteries are finally discussed.
