Rationally designed heterostructures provide attractive prospects for energy storage electrodes by combining different active materials with distinct electrochemical properties.Herein,through a phase separation strate...Rationally designed heterostructures provide attractive prospects for energy storage electrodes by combining different active materials with distinct electrochemical properties.Herein,through a phase separation strategy,a heterostructure of SnO_(2) encapsulated by amorphous Nb_(2)O_(5) is spontaneously synthesized.Insertion-type anode Nb_(2)O_(5) outer shell,playing as reaction containers and fast ionic pathways,physically inhibits the Sn atoms’migration and enhances the reaction kinetics.Moreover,strong chemical interactions are found at the SnO_(2)/Nb_(2)O_(5) interfaces,which ensure the solid encapsulation of the SnO_(2) cores even after 500 cycles.When used for lithium-ion batteries,this heterostructured anode exhibits high cycling stability with a capacity of 626 mAhg^(-1) after 1000 cycles at 2Ag^(-1)(85% capacity retention)and good rate performance with the capacity of 340 mAhg^(-1) at 8Ag^(-1).展开更多
The phase transition of 2,5-distyrylpyrazine （DSP） adsorbed on Au（111） substrate was studied as a function of the substrate potential in 0.1 M HC104, using an in situ scanning tunneling microscope （STM）. Dependi...The phase transition of 2,5-distyrylpyrazine （DSP） adsorbed on Au（111） substrate was studied as a function of the substrate potential in 0.1 M HC104, using an in situ scanning tunneling microscope （STM）. Depending on the applied electric field, DSP formed three distinctly different, two-dimensionally （2D） ordered, supramolecular nanostructures on the Au（111） surface. In the potential range of 0.55 V 〈 E 〈 0.75 V, the DSP molecules formed a close-packed stripe pattern with the adlayer structure （81 ）. When theptentiawareducedt45V〈E〈.55Varidge-ikepaernbuitfrmdimersubunitswasb- 4 5）. decreasing in the electrode potential to 0.2 V 〈 E 〈 0.45 V caused the served, with the adlayer structure -12 Further fn appearance of a herringbone-like pattern consisting of dimer subunits, with the adlayer structure The potential-induced phase transitions revealed the structure-determining role of substrate-adsorbate coordination and intermolecular interaction in forming the distinct 2D adlayer motifs.展开更多
基金supported by China Postdoctoral Science Foundation(2020M671242 and 2021T140688)the Special Research Assistant program of CASthe Super Postdoctoral Fellow Program of Shanghai。
文摘Rationally designed heterostructures provide attractive prospects for energy storage electrodes by combining different active materials with distinct electrochemical properties.Herein,through a phase separation strategy,a heterostructure of SnO_(2) encapsulated by amorphous Nb_(2)O_(5) is spontaneously synthesized.Insertion-type anode Nb_(2)O_(5) outer shell,playing as reaction containers and fast ionic pathways,physically inhibits the Sn atoms’migration and enhances the reaction kinetics.Moreover,strong chemical interactions are found at the SnO_(2)/Nb_(2)O_(5) interfaces,which ensure the solid encapsulation of the SnO_(2) cores even after 500 cycles.When used for lithium-ion batteries,this heterostructured anode exhibits high cycling stability with a capacity of 626 mAhg^(-1) after 1000 cycles at 2Ag^(-1)(85% capacity retention)and good rate performance with the capacity of 340 mAhg^(-1) at 8Ag^(-1).
基金supported by the Chinese Academy of Sciences (KZCX2-YW-QN407)the National 973 Program (2009CB421606)+2 种基金the National Natural Science Foundation of China (51078346, 21177141)Youth Innovation Promotion Association, CASthe Project sponsored by SRF for ROCS, SEM
文摘The phase transition of 2,5-distyrylpyrazine （DSP） adsorbed on Au（111） substrate was studied as a function of the substrate potential in 0.1 M HC104, using an in situ scanning tunneling microscope （STM）. Depending on the applied electric field, DSP formed three distinctly different, two-dimensionally （2D） ordered, supramolecular nanostructures on the Au（111） surface. In the potential range of 0.55 V 〈 E 〈 0.75 V, the DSP molecules formed a close-packed stripe pattern with the adlayer structure （81 ）. When theptentiawareducedt45V〈E〈.55Varidge-ikepaernbuitfrmdimersubunitswasb- 4 5）. decreasing in the electrode potential to 0.2 V 〈 E 〈 0.45 V caused the served, with the adlayer structure -12 Further fn appearance of a herringbone-like pattern consisting of dimer subunits, with the adlayer structure The potential-induced phase transitions revealed the structure-determining role of substrate-adsorbate coordination and intermolecular interaction in forming the distinct 2D adlayer motifs.
