Hydrothermal ion exchange synthesis of CoM(M=Fe or Mn)/MXene 2D/2D hierarchal architectures for enhanced energy storage

•The 2D/2D hierarchical CoM-LDH(M=Fe or Mn)/MXene composites were synthesized through introduction of metal ions into LDHs.•The enhanced specific capacity and rate capability of monometallic compounds by introducing Fe and Mn ions .•The CF-MX10 electrode exhibits the highest specific capacity of 808 F g−1 at 0.5 A g−1 than that of CM-MX10 and C-MX10.•The high areal capacity and rate capacity are also attributed to strong synergistic effect between CoM-LDH and MXene.