Transition-metal sulfides/selenides are explored as advanced electrode materials for nonaqueous sodium-ion capacitors, using FeSSe as an example. A solid solution of S/Se in FeSSe allows it to combine the high capacity of FeS and the good diffusion kinetics of FeSe together, thereby exhibiting excellent cycle stability (∼220 mA h g after 6000 cycles at 2 A g) and superior rate capability (∼210 mA h g at 40 A g) within 0.8-3.0 V. These results are much better than those of FeS and FeSe, confirming the advantages of S/Se solid solution, as supported by EIS spectra, DFT calculations, and electronic conductivity. As FeSSe is paired with the activated carbon (AC) as Na-ion capacitors, this device is also better than sodium-ion batteries of FeSSe //NaV(PO) 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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