▎ 摘　　要

High rate capacity and long-term cycling stability are the pursuing characteristic of a promising anode for sodium-ion capacitors (SICs). However, the sluggish reaction kinetics and aggregation of volume during sodiation/desodiation process are the main obstacles. In this work, we developed a 3D porous WO2/WS2-rGO network while urchin-like microspheres self-assembled by WO2/WS2 heterogeneous nanosheets and wrapped by rGO network, demonstrating superior rate properties and cycling stability as the anode of sodium-ion batteries (SIBs). The ultrathin WO2/WS2 nanosheets contribute to shorten the Na+ diffusion length, while metallic WO2 guaranteeing high electric conductivity of nanosheet units and rGO network help to construct the fast dual electron transfer pathways during sodiation/desodiation process. Also, rGO network can provide a stable structure protecting layer and alleviate the volume change of WO2/WS2. Benefiting from these merits, WO2/WS2-rGO electrode reveals a dominanting capacitive-controlled process especially at the higher scan rates and achieves 100 mAh g-1 at an ultrahigh current density of 25.6 A g-1 as well as maintains 90% capacity retention over 1000 cycles at 1 A g-1. The SICs comprising of WO2/WS2-rGO anode and 3D phosphorus-doped carbon (PAC) cathode demonstrate outstanding energy density of 140 Wh kg-1 at 200 W kg-1 along with a reasonable stable cycling of 79% capacity retention over 6000 cycles at 5 A g-1 within the voltage of 0.0-4.0 V. The proposed strategy integrates hierarchical heterogeneous structure and effective dual electron transfer network can be applied to develop promising electrode materials for high performance energy storage systems.