“…To address the above issues, a general strategy is to combine MnO 2 with conductive components [26][27][28] such as carbon nanotubes (CNTs) [29][30][31], graphene [32,33], and conductive polymers [34,35]. For example, the conductive polymer wrapped graphene/MnO 2 composite exhibits a high specific capacitance of $380 F g À1 at a current density of 0.1 mA cm À2 and $175 F g À1 at 5 mA cm À2 [36], while MnO 2 /CNT composite material delivers a capacitance of 201 F g À1 at a current density of 1.0 A g À1 and 140 F g À1 at 20 A g À1 [37]. Beyond this, it is also important to design and build novel architectures with efficient ion-and electron-transport pathways as well as robustness to further improve the electrode kinetics and integrity, which is highly demanded by highperformance supercapacitors [38,39].…”