▎ 摘　　要

A multihierarchical structure with (NH4)(Ni, Co)PO(4)0.67H(2)O microplatelets and (Ni, Co)(3)(PO4)(2)center dot 8H(2)O ultrathin nanopieces anchored on reduced graphene oxide (NCNP/RGO) is synthesized via a mild hydrothermal approach. This unique interface-rich structure is suitable for a high power energy storage device by providing efficient pathways for both electronic conduction and ionic transportation, which are effective ways to improve the electrochemical performance. Specifically, a specific capacity of 993 F g(-1) is obtained in the three-electrode measurement, with ultrahigh capacity retention of 81.2% (807 F g(-1)) from 0.5 to 32 A g(-1). The hybrid device constructed with the as-prepared NCNP/RGO as anode and a hierarchical porous carbon (HPC) as cathode offers a very superior energy density of 42.1 Wh kg(-1) at a power density of 73 W kg(-1), which remains 32 Wh kg(-1) at 14 kW kg(-1). Meanwhile, the as-prepared hybrid capacitor exhibits a remarkable cycling stability (96.5% capacitance retention after 10 000 cycles). The capacity contribution of capacitive behavior for the hybrid device is analyzed as 91.1% at 25 mV s(-1).