As environmentally benign and high-efficiency energy storage devices,sodium-ion capacitors(SICs),which combine the merits of batteries and supercapacitors,are considered to have potentially high energy/power densities and long lifespan.However,the lack of high-rate anodes that can match the high-power-density cathode hinders the commercial application of SICs.In this work,heterostructured Fe/FeSe2/Fe3Se4 nanocomposite is pre-pared by chemical vapor deposition(CVD)method and investigated as the anode for SICs.Through heterointerface manipulation,Fe/FeSe2/Fe3Se4 demonstrates better sodium ion storage performances than the pure FeSe2 and FeSe2/Fe3Se4.It can deliver a specific capacity of 484.8 mAh·g-1 after 100 cycles at 0.5 A·g-1,as well as a good capacity retention.The excellent performance of Fe/FeSe2/Fe3Se4 nanocomposite can be ascribed to the synergistic effect of the heterointerface engineered components,where FeSe2 and Fe3Se4 are responsible for offering a high capacity and metallic Fe can server as mini-current collectors,effec-tively accelerating the electron and charge transfer behavior.Meanwhile,the heterointerface significantly facilitates the sodium ion fast transport,and retards the structural variation during cycling.FeSe-1000//activated carbon(AC)SIC affords a high energy density of 112 Wh·kg-1 at 107.5 W·kg-1,its power density can achieve 10,750 W·kg-1 with remained energy density of 44.2 Wh·kg-1,as well as an outstanding cycling stability,demonstrating this effective heterointerface engineered anode strategy for high-performance SICs.

Pu-Guang Ji;Ying Liu;Shuang-Bin Han;Yu-Fu Yan;Oleg Victorovich Tolochko;Eugene Strativnov;Mirtemir Shodievich Kurbanov;Hua Wang;Cheng-Wei Zhang;Gong-Kai Wang

School of Materials Science&Engineering and Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology,Hebei University of Technology,Tianjin 300130,China;Institute of Machinery,Materials,and Transport,Peter the Great St.Petersburg Polytechnic University,Saint Petersburg 195251,Russian Federation;The Gas Institute of the National Academy of Sciences of Ukraine,Kyiv 03113,Ukraine;Arifov Institute of Ion-Plasma and Laser Technologies,Academy of Sciences of the Republic of Uzbekistan,Tashkent 100125,Uzbekistan;School of Chemistry,Beijing Advanced Innovation Center for Biomedical Engineering,Beihang University,Beijing 100191,China

稀有金属（英文版）

[1]Pu-Guang Ji;Ying Liu;Shuang-Bin Han;Yu-Fu Yan;Oleg Victorovich Tolochko;Eugene Strativnov;Mirtemir Shodievich Kurbanov;Hua Wang;Cheng-Wei Zhang;Gong-Kai Wang-.Synergistical heterointerface engineering of Fe-Se nanocomposite for high-performance sodium-ion hybrid capacitors)[J].稀有金属（英文版）,2022(07):2470-2480

Synergistical,Fe3Se4

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