摘要
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/FeSe_(2)/Fe_(3)Se_(4)nanocomposite is pre-pared by chemical vapor deposition(CVD)method and investigated as the anode for SICs.Through heterointerface manipulation,Fe/FeSe_(2)/Fe_(3)Se_(4)demonstrates better sodium ion storage performances than the pure FeSe_(2)and FeSe_(2)/Fe_(3)Se_(4).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/FeSe_(2)/Fe_(3)Se_(4)nanocomposite can be ascribed to the synergistic effect of the heterointerface engineered components,where FeSe_(2)and Fe_(3)Se_(4) 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.
出处
《Rare Metals》
SCIE
EI
CAS
CSCD
2022年第7期2470-2480,共11页
稀有金属（英文版）
基金
financially supported by the Natural Science Foundation of Hebei Province of China(Nos.E2021202011 and E2018202123)
Jian-Hua Research Foundation of Hebei University of Technology(No.HB1921)
High-strength,Highprecision,Superconducting Rail Transit Aluminum Research and Development and Industrialization Projects(No.2019TSLH0110)
"One Belt,One Road"Technology Innovation Cooperation Project of Tianjin(No.18PTZWHZ00220)
Ministry of Science and Higher Education of the Russian Federation as part of World-class Research Center program(No.075-15-2020-934)
Foundation of Strengthening Program(No.2019-JCJQ-142-00)
the Exchange Project of the Third Meeting of the Science and Technology Cooperation Subcommittee of the China-Ukraine Intergovernmental Cooperation Committee(No.CU03-11).
