One-step microwave synthesis of FeSe₂@CNT as high-performance supercapacitor anode material

Abstract

In this work, FeSe₂@CNT nanocomposite anode materials are fabricated using a convenient and efficient one-step microwave method. The FeSe₂@CNT electrode exhibits superior electrochemical performance. The carbon nanotube structure effectively mitigates the severe volume change in the FeSe₂@CNT electrode during continuous charge and discharge. Thus, the capacitance value of 573 F g⁻¹ and capacitance retention of 81.9% for 3000 constant current charge and discharge cycles are achieved. In addition, the asymmetric device assembled with FeSe₂@CNT as the anode and NiSe₂@CNT as the cathode exhibits high Energy density (E can reach 41.32 Wh kg⁻¹ when P is 800 W kg⁻¹), and the device achieves 82.6% capacity retention after 3000 cycles.