Sb-based materials have been considered one of the most promising anode electrode materials for lithium-ion batteries,whereas they were commonly synthesized through time-consuming and costly processes.Here,Sb@Sb2O3/re...Sb-based materials have been considered one of the most promising anode electrode materials for lithium-ion batteries,whereas they were commonly synthesized through time-consuming and costly processes.Here,Sb@Sb2O3/reduced graphene oxide(Sb@Sb2O3/rGO)composite was successfully synthesized by a facile one-pot chemical method at ambient temperature.Based on the XRD and TGA analysis,the mass fractions of Sb and Sb2O3 in the Sb@Sb2O3/rGO composite are ca.34.05%and 26.6%,respectively.When used as an alternative electrode for lithium ion batteries,a high reversible capacity of 790.9 mA·h/g could be delivered after 200 cycles with the capacity retention of 93.8%at a current density of 200 mA/g.And a capacity of 260 mA·h/g could be maintained even at 2000 mA/g.These excellent electrochemical properties can be attributed to its well-constructed nanostructure.The Sb and Sb2O3 particles with size of 10 nm were tightly anchored on rGO sheets through electronic coupling,which could not only alleviate the stress induced by the volume expansion,suppress the aggregation of Sb and Sb2O3 particles,but also improve the electron transfer ability during cycling.展开更多
Controllable interfacial alloying is achieved at a Au-ZnSe nanowire(M-S)contact via in situ Joule heating inside transmission electron microscopy(TEM).TEM inspection reveals that the Au electrode is locally molten at ...Controllable interfacial alloying is achieved at a Au-ZnSe nanowire(M-S)contact via in situ Joule heating inside transmission electron microscopy(TEM).TEM inspection reveals that the Au electrode is locally molten at the M-S contact and the tip of the ZnSe nanowire is covered by the Au melting.Experimental evidences confirm that the alloying at the reversely biased M-S contact is due to the high resistance of the Schottky barrier at this M-S contact,coincident to cathode-control mode.Consequently,in situ Joule heating can be an effective method to improve the performance of nanoelectronics based on a metal-semiconductor-metal nanostructure.展开更多
基金Project(51462032)supported by the National Natural Science Foundation of ChinaProject(17JR5RA066)supported by the Foundation for Distinguished Young Scholars of Gansu Province,China
文摘Sb-based materials have been considered one of the most promising anode electrode materials for lithium-ion batteries,whereas they were commonly synthesized through time-consuming and costly processes.Here,Sb@Sb2O3/reduced graphene oxide(Sb@Sb2O3/rGO)composite was successfully synthesized by a facile one-pot chemical method at ambient temperature.Based on the XRD and TGA analysis,the mass fractions of Sb and Sb2O3 in the Sb@Sb2O3/rGO composite are ca.34.05%and 26.6%,respectively.When used as an alternative electrode for lithium ion batteries,a high reversible capacity of 790.9 mA·h/g could be delivered after 200 cycles with the capacity retention of 93.8%at a current density of 200 mA/g.And a capacity of 260 mA·h/g could be maintained even at 2000 mA/g.These excellent electrochemical properties can be attributed to its well-constructed nanostructure.The Sb and Sb2O3 particles with size of 10 nm were tightly anchored on rGO sheets through electronic coupling,which could not only alleviate the stress induced by the volume expansion,suppress the aggregation of Sb and Sb2O3 particles,but also improve the electron transfer ability during cycling.
基金Supported by the National Natural Science Foundation of China under Grant Nos 60796078 and 10774174.
文摘Controllable interfacial alloying is achieved at a Au-ZnSe nanowire(M-S)contact via in situ Joule heating inside transmission electron microscopy(TEM).TEM inspection reveals that the Au electrode is locally molten at the M-S contact and the tip of the ZnSe nanowire is covered by the Au melting.Experimental evidences confirm that the alloying at the reversely biased M-S contact is due to the high resistance of the Schottky barrier at this M-S contact,coincident to cathode-control mode.Consequently,in situ Joule heating can be an effective method to improve the performance of nanoelectronics based on a metal-semiconductor-metal nanostructure.
