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Nitrogen-doped black titania for high performance supercapacitors 被引量:3
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作者 Chongyin Yang Xin Wang +6 位作者 Wujie Dong I-Wei Chen Zhou Wang Jijian Xu Tianquan Lin Hui Gu Fuqiang Huang 《Science China Materials》 SCIE EI CSCD 2020年第7期1227-1234,共8页
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
关键词 black titania SUPERCAPACITOR nitrogen-dopant N-mediated redox reactions
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棉花基多孔碳材料的合成、微结构及超电性能研究(英文) 被引量:2
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作者 郝燕霞 钱猛 +2 位作者 毕辉 黄富强 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2018年第1期93-99,共7页
由于制备方法简单并且原料易得,多孔碳合成广泛采用生物质材料,并用于能源存储。以天然生物质棉花作为碳源,通过简单的一步法制备得到氮掺杂多孔碳材料。这种多孔碳材料在碳化温度为750℃时具有480 m^2/g的比表面积和6.84%的高含氮量。... 由于制备方法简单并且原料易得,多孔碳合成广泛采用生物质材料,并用于能源存储。以天然生物质棉花作为碳源,通过简单的一步法制备得到氮掺杂多孔碳材料。这种多孔碳材料在碳化温度为750℃时具有480 m^2/g的比表面积和6.84%的高含氮量。当用作超级电容器电极材料时,这种碳材料显示出了良好的电容性能。在1 mol/L硫酸电解液中,电流密度为1 mol/L时,比电容可以达到252 F/g,并且在循环10000圈之后仍能保留94%的原电容。这种低成本的棉花基碳材料为超级电容器应用提供了可能。 展开更多
关键词 棉花 多孔碳 超级电容器
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Achieving highly stable Sn-based anode by a stiff encapsulation heterostructure 被引量:2
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作者 Ruizhe Li Jijian Xu +2 位作者 Zhuoran Lv Wujie Dong Fuqiang Huang 《Science China Materials》 SCIE EI CAS CSCD 2022年第3期695-703,共9页
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
关键词 HETEROSTRUCTURE ENCAPSULATION SnO2/Nb2O5 interface chemical interaction atom migration
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Two-dimensional TiNCl for capacitive-like lithium-ion storage 被引量:1
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作者 Linggang Fan Shaoning Zhang +5 位作者 Wujie Dong Jijian Xu Xiangli Che Ruizhe Li Hui Bi Fuqiang Huang 《Science China Materials》 SCIE EI CAS CSCD 2022年第11期2942-2948,共7页
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
关键词 lithium-ion battery high-rate performance TiNCl titanium-based anode
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