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Solid-Solution Anion-Enhanced Electrochemical Performances of Metal Sulfides/Selenides for Sodium-Ion Capacitors: The Case of FeS 2- x Se x .

Transition-metal sulfides/selenides are explored as advanced electrode materials for nonaqueous sodium-ion capacitors, using FeS2- x Se x as an example. A solid solution of S/Se in FeS2- x Se x allows it to combine the high capacity of FeS2 and the good diffusion kinetics of FeSe2 together, thereby exhibiting excellent cycle stability (∼220 mA h g-1 after 6000 cycles at 2 A g-1 ) and superior rate capability (∼210 mA h g-1 at 40 A g-1 ) within 0.8-3.0 V. These results are much better than those of FeS2 and FeSe2 , confirming the advantages of S/Se solid solution, as supported by EIS spectra, DFT calculations, and electronic conductivity. As FeS2- x Se x is paired with the activated carbon (AC) as Na-ion capacitors, this device is also better than sodium-ion batteries of FeS2- x Se x //Na3 V2 (PO4 )3 and sodium-ion capacitors of metal oxides//AC, particularly at high rates. These results open a new door for the applications of sulfides/selenides in another device of electrochemical energy storage.

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