For energy storage system,it is still a huge challenge to achieve high energy density and high power density simultaneously.One potential solution is to fabricate electrochemical capacitors(ECs),which store electric e...For energy storage system,it is still a huge challenge to achieve high energy density and high power density simultaneously.One potential solution is to fabricate electrochemical capacitors(ECs),which store electric energy through surface ion adsorption or redox reactions.Here we report a new electrode material,heavy nitrogen-doped(9.29 at.%)black titania(TiO2-x:N).This unique hybrid material,consisting of conductive amorphous shells supported on nanocrystalline cores,has rapid N-mediated redox reaction(TiO2-xNy+zH++ze■-TiO2-xNyHz),especially in acidic solutions,providing a specific capacitance of 750 Fg-1at 2 m V s-1(707 Fg-1at 1 A g-1),great rate capability(503 F g-1at 20 Ag-1),and maintain stable after initial fading.Being a new developed supercapacitor material,nitrogen-doped black titania may revive the oxide-based supercapacitors.展开更多
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
In this study,TiNCl was designed and applied in high-rate lithium-ion batteries(LIBs),and the mechanism of the energy storage in TiNCl was uncovered.The Ti-N layer serves as the electronic conductive unit for its high...In this study,TiNCl was designed and applied in high-rate lithium-ion batteries(LIBs),and the mechanism of the energy storage in TiNCl was uncovered.The Ti-N layer serves as the electronic conductive unit for its high conductivity,while the polyhedral channels constructed with Cl facilitate the transmission of Li ions serving as the ionic conductive units.In addition,due to the negatively charged nature of Cl,the TiNCl anode has a capacitive contribution up to 99.5%at 1 mV s.Even at a high rate of 50 C,it still retains a remarkable reversible capacity of 202 mA h gafter 1000 cycles.The concept based on the structure design develops new electrode materials with desired properties.展开更多
基金financially supported by the National key R&D Program of China(2016YFB0901600)the Key Research Program of Chinese Academy of Sciences(QYZDJ-SSWJSC013)Chen IW was supported by U.S.Department of Energy BES grant DE-FG02-11ER46814used the facilities(Laboratory for Research on the Structure of Matter)supported by NSF grant DMR-1120901。
文摘For energy storage system,it is still a huge challenge to achieve high energy density and high power density simultaneously.One potential solution is to fabricate electrochemical capacitors(ECs),which store electric energy through surface ion adsorption or redox reactions.Here we report a new electrode material,heavy nitrogen-doped(9.29 at.%)black titania(TiO2-x:N).This unique hybrid material,consisting of conductive amorphous shells supported on nanocrystalline cores,has rapid N-mediated redox reaction(TiO2-xNy+zH++ze■-TiO2-xNyHz),especially in acidic solutions,providing a specific capacitance of 750 Fg-1at 2 m V s-1(707 Fg-1at 1 A g-1),great rate capability(503 F g-1at 20 Ag-1),and maintain stable after initial fading.Being a new developed supercapacitor material,nitrogen-doped black titania may revive the oxide-based supercapacitors.
基金National Key Research and Development Program(2016YFB0901600) National Natural Science Foundation of China(61376056)+1 种基金 Science and Technology Commission of Shanghai(14520722000,16JC1401700) Shanghai Science and Technology Development Funds(16QA1404200)
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 National Natural Science Foundation of China(21871008 and 51972326)the Key Research Program of Chinese Academy of Sciences(QYZDJ-SSW-JSC013)+1 种基金the Science and Technology Commission of Shanghai Municipality(22ZR1471300)the Youth Innovation Promotion Association CAS。
文摘In this study,TiNCl was designed and applied in high-rate lithium-ion batteries(LIBs),and the mechanism of the energy storage in TiNCl was uncovered.The Ti-N layer serves as the electronic conductive unit for its high conductivity,while the polyhedral channels constructed with Cl facilitate the transmission of Li ions serving as the ionic conductive units.In addition,due to the negatively charged nature of Cl,the TiNCl anode has a capacitive contribution up to 99.5%at 1 mV s.Even at a high rate of 50 C,it still retains a remarkable reversible capacity of 202 mA h gafter 1000 cycles.The concept based on the structure design develops new electrode materials with desired properties.