“…When the current density was increased to 10 A g −1 , the power density reached 8000 W kg −1 and the energy density was still maintained at 25.8 W h kg −1 . The energy density and power density of the 2-CSNS@CNT//AC device produced by this method were similar to or higher than some recent reports, such as Co 3 S 4 /CNTs/C//AC (41.3 W h kg −1 at 691.9 W kg −1 ), 35 CuCo 2 S 4 /CNTs//CNTs (37.32 W h kg −1 at 800.7 W kg −1 ), 36 3DG/CNTs/MnO 2 //AC (33.71 W h kg −1 at 22 727.3 W kg −1 ), 37 Ti 3 C 2 /CNTs/MnCo 2 S 4 //Ti 3 C 2 /CNTs/ MnCo 2 S 4 (49.5 W h kg −1 at 350 W kg −1 ), 38 Fe 3 O 4 /N-CNTs//AC (25.9 W h kg −1 at 699 W kg −1 ) 39 and NiCo 2 O 4 /CNTs//AC (32.5 W h kg −1 at 800 W kg −1 ). 40 This method provides an effective idea for the preparation of high power and high energy density ASCs.…”