Developing a heterostructure for alloying-based anode for sodium-ion batteries(SIBs)is an efficient solution to accommodate volume change upon sodiation/desodiation and boost sodium storage since it combines the merit...Developing a heterostructure for alloying-based anode for sodium-ion batteries(SIBs)is an efficient solution to accommodate volume change upon sodiation/desodiation and boost sodium storage since it combines the merits of each component.Herein,we report a metallic and microphone-like Sn-Zn_(0.9)Mn_(0.1)O heterostructure via an in-situ Mn doping strategy.Based on theoretical calculations and experimental results,the introduction of Mn into Zn O(a small amount of Mn also diffuses into the Sn lattice)can not only enhance intrinsic electronic conductivity but also reduce the Na^(+)diffusion barrier inside the Sn phase.When evaluated as anode for SIBs,the obtained heterostructures show a high reversible capacity of 395.1 mAh/g at 0.1 A/g,rate capability of 332 mAh/g at 5 A/g,and capacity retention of almost 100%after 850 cycles at 5 A/g,indicating its great potential for high-power application of SIBs.展开更多
A new method for increasing the three phase boundaries in anode of SOFC is reported. The results of the study show that the three phase boundaries in the SOFC anode Ni+YSZ are greatly increased by doping Ce 0.9 Ca 0.1...A new method for increasing the three phase boundaries in anode of SOFC is reported. The results of the study show that the three phase boundaries in the SOFC anode Ni+YSZ are greatly increased by doping Ce 0.9 Ca 0.1 O 2- δ particles , and the transportation of oxygen ion in the anode is improved as well. By adding Ce 0.9 Ca 0.1 O 2- δ particles, the composite anode is produced and the anode reaction is accelerated, resulting in an improvement of SOFC output properties. The highest power density of SOFC with the anode of Ni+YSZ doped by Ce 0.9 Ca 0.1 O 2- δ particles in a weight ratio of 15%, which is about 3 times higher than that of SOFC with the anode Ni+YSZ without doping, is obtained. [WT5HZ]展开更多
TiO2-SnO2-SiO2 nanocomposite photocatalysts were prepared with Na2SiO3·9H2O, SnCl4·5H2O and TiCl4 as precursors by chemistry coating processes and supercritical fluid drying (SCFD) method. Characterizations ...TiO2-SnO2-SiO2 nanocomposite photocatalysts were prepared with Na2SiO3·9H2O, SnCl4·5H2O and TiCl4 as precursors by chemistry coating processes and supercritical fluid drying (SCFD) method. Characterizations with XRD, TEM, NMR and FTIR showed that in addition to anatase type TiO2, a new active phase(Ti,Sn)O2 was also formed in the range of the studied doping concentration, The catalytic activity was evaluated by photocatalytic degradation of phenol as model reaction. SiO2 remained amphorous at all samples. It could prevent from growth of the size of nanopaticle and transformation from anatase to rutile. Compared with pure TiO2, or TiO2-SnO2 catalyst prepared by Sol-gel method, Nano-composite photo-catalyst showed significant improvement in catalytic activity, the photo-catalytic degradation rate of phenol in 7 h reached 88.7%. Application of the composite catalysts for the photocatalytic decomposition of phenol not only gave the same activity relative to pure ultrafine TiO2, but also reduced cost. The experimental results also proved that the thermal stability of TiO2 was greatly enhanced after mixing with small amount of SiO2. The optimized doping of SiO2 was 20.3%. The photo-catalyst prepared by SCFD combination technology was characterized with smaller particle size, larger surface area and higher activity.展开更多
基金financially supported by the National Natural Science Foundation of China(No.52072119)Hunan Provincial Natural Science Foundation(No.2023JJ50015)the 111 Project(No.D20015)。
文摘Developing a heterostructure for alloying-based anode for sodium-ion batteries(SIBs)is an efficient solution to accommodate volume change upon sodiation/desodiation and boost sodium storage since it combines the merits of each component.Herein,we report a metallic and microphone-like Sn-Zn_(0.9)Mn_(0.1)O heterostructure via an in-situ Mn doping strategy.Based on theoretical calculations and experimental results,the introduction of Mn into Zn O(a small amount of Mn also diffuses into the Sn lattice)can not only enhance intrinsic electronic conductivity but also reduce the Na^(+)diffusion barrier inside the Sn phase.When evaluated as anode for SIBs,the obtained heterostructures show a high reversible capacity of 395.1 mAh/g at 0.1 A/g,rate capability of 332 mAh/g at 5 A/g,and capacity retention of almost 100%after 850 cycles at 5 A/g,indicating its great potential for high-power application of SIBs.
文摘A new method for increasing the three phase boundaries in anode of SOFC is reported. The results of the study show that the three phase boundaries in the SOFC anode Ni+YSZ are greatly increased by doping Ce 0.9 Ca 0.1 O 2- δ particles , and the transportation of oxygen ion in the anode is improved as well. By adding Ce 0.9 Ca 0.1 O 2- δ particles, the composite anode is produced and the anode reaction is accelerated, resulting in an improvement of SOFC output properties. The highest power density of SOFC with the anode of Ni+YSZ doped by Ce 0.9 Ca 0.1 O 2- δ particles in a weight ratio of 15%, which is about 3 times higher than that of SOFC with the anode Ni+YSZ without doping, is obtained. [WT5HZ]
文摘TiO2-SnO2-SiO2 nanocomposite photocatalysts were prepared with Na2SiO3·9H2O, SnCl4·5H2O and TiCl4 as precursors by chemistry coating processes and supercritical fluid drying (SCFD) method. Characterizations with XRD, TEM, NMR and FTIR showed that in addition to anatase type TiO2, a new active phase(Ti,Sn)O2 was also formed in the range of the studied doping concentration, The catalytic activity was evaluated by photocatalytic degradation of phenol as model reaction. SiO2 remained amphorous at all samples. It could prevent from growth of the size of nanopaticle and transformation from anatase to rutile. Compared with pure TiO2, or TiO2-SnO2 catalyst prepared by Sol-gel method, Nano-composite photo-catalyst showed significant improvement in catalytic activity, the photo-catalytic degradation rate of phenol in 7 h reached 88.7%. Application of the composite catalysts for the photocatalytic decomposition of phenol not only gave the same activity relative to pure ultrafine TiO2, but also reduced cost. The experimental results also proved that the thermal stability of TiO2 was greatly enhanced after mixing with small amount of SiO2. The optimized doping of SiO2 was 20.3%. The photo-catalyst prepared by SCFD combination technology was characterized with smaller particle size, larger surface area and higher activity.
