▎ 摘　　要

Herein, the circular ring-like cobalt manganese pyrophosphate (Co0.55Mn0.45)(2)P2O7 wrapped by nitrogen-doped graphene (NG) are synthetized through a facile one-step microwave method with numerous open porous structures as electrochemically active sites. The circular ring-like (Co0.55Mn0.45)(2)P2O7 possess honeycomb-like structures to storage more ions and have more electrochemically active sites from the honeycomb edges, which faster ion/electron transporting through the pores. Therefore, these honeycomb-like hybrids obtain an excellent specific capacity of 236.21 mA h g(-1) at 1 A.g(-1) under three-electrode conditions, contribution a wonderful cycle stability of 86.7% after 10,000 cycles. Anode material of asymmetric supercapacitor (ASC) is assembled with biomass hierarchical glucose carbon (HGC), the maximum energy density of the ASC device is 75.72 Wh.kg(-1) at a power density of 800 W.kg(-1) (remained 60.08 Wh.kg(-1) at 8000 W.kg(-1)). The enhanced capacitive storage of the ASC device can be attributed to the interconnected circular ring-like structure and the perfect combination of nitrogen-doped graphene. (C) 2021 Elsevier Ltd. All rights reserved.