Greatly Enhanced Faradic Capacities of 3D Porous Mn 3 O 4 /G Composites as Lithium-Ion Anodes and Supercapacitors by C-O-Mn Bonding.

Through C-O-Mn bonding, graphene nanosheets are homogeneously dispersing in porous Mn3O4 to use full advantages of porous Mn3O4 and graphene nanosheets, making the as-formed 3D porous Mn3O4/rGO composite exhibit good electrochemical performance. And C-O-Mn are demonstrated to greatly promote the Faradic reactions of the composite, resulting in the enhancement of its real capacity in supercapacitor (SC) electrode as well as lithium ion battery (LIB) anode. By simply fine-tuning the content of graphene (< 7 wt.%), the composite with a 2.8 wt.% of rGO delivers a high capacitance of 315 F g-1 at 0.5 A g-1 with a high rate capability of 64.7% at 30 A g-1 and excellent cycling stability of 105% (5 A g-1, 5000 cycles) as a SC electrode. And the one with 6.9 wt.% rGO can present a reversible capacity of over 1500 mA h g-1 at 0.05 A g-1 as the LIB anode, the highest value reported at present, which remains 561 mAh g-1 at 1 A g-1.