Well-dispersed SnO2 nanorods with diameter of 4-15 nm and length of 100-200 nm are synthesised through a hydrothermal route and their potential as anode materials in lithium-ion batteries is investigated. The observed...Well-dispersed SnO2 nanorods with diameter of 4-15 nm and length of 100-200 nm are synthesised through a hydrothermal route and their potential as anode materials in lithium-ion batteries is investigated. The observed initial discharge capacity is as high as 1778 mA.h/g, much higher than the theoretical value of the bulk SnO2 （1494 mA.h/g）. During the following 15 cycles, the reversible capacity decreases from 929 to 576 mA-h/g with a fading rate of 3.5% per cycle. The fading mechanism is discussed. Serious capacity fading can be avoided by reducing the cycling voltages from 0.05-3.0 to 0.4-1.2 V. At the end, SnO2 nanorods with much smaller size are synthesized and their performance as anode materials is studied. The size effect on the electrochemical properties is briefly discussed.展开更多
Flower-liked SnO_2 nanorods were prepared by a hydrothermal method.The sensors were fabricated using SnO_2 nanorods adsorption of Au nanoparticles through sputtering deposition.We found that the loading of a small amo...Flower-liked SnO_2 nanorods were prepared by a hydrothermal method.The sensors were fabricated using SnO_2 nanorods adsorption of Au nanoparticles through sputtering deposition.We found that the loading of a small amount of Au nanoparticles on the surface of SnO_2 nanorods can effectively enhance and functionalize the gas sensing performance of SnO_2 nanorods,which due to the Au adsorption make the surface-depletion effect more pronounced.Such enhanced surface depletion increases the sensitivity,lowers the operation temperature and decreases the response time.展开更多
基金Project supported by the National Key Basic Research Program of China (Grant No 2007CB310500)the Chinese Ministry of Education (Grant No 705040)the National Natural Science Foundation of China (Grant Nos 90606009, 60571044 and 10774174)
文摘Well-dispersed SnO2 nanorods with diameter of 4-15 nm and length of 100-200 nm are synthesised through a hydrothermal route and their potential as anode materials in lithium-ion batteries is investigated. The observed initial discharge capacity is as high as 1778 mA.h/g, much higher than the theoretical value of the bulk SnO2 （1494 mA.h/g）. During the following 15 cycles, the reversible capacity decreases from 929 to 576 mA-h/g with a fading rate of 3.5% per cycle. The fading mechanism is discussed. Serious capacity fading can be avoided by reducing the cycling voltages from 0.05-3.0 to 0.4-1.2 V. At the end, SnO2 nanorods with much smaller size are synthesized and their performance as anode materials is studied. The size effect on the electrochemical properties is briefly discussed.
文摘Flower-liked SnO_2 nanorods were prepared by a hydrothermal method.The sensors were fabricated using SnO_2 nanorods adsorption of Au nanoparticles through sputtering deposition.We found that the loading of a small amount of Au nanoparticles on the surface of SnO_2 nanorods can effectively enhance and functionalize the gas sensing performance of SnO_2 nanorods,which due to the Au adsorption make the surface-depletion effect more pronounced.Such enhanced surface depletion increases the sensitivity,lowers the operation temperature and decreases the response time.
