[en] Highlights: : • A reasonable design strategy for hierarchical porous structures was developed. • A new design of 3D conductive carbonaceous network structure has been proposed. • Fe₃Se₄@NC@CNTs electrode exhibited excellent Na⁺ storage and HER performance. -- Abstract: : The hierarchical porous structure has been attracted increasing attention during the design of advanced electrode materials for energy storage and conversion fields. Herein, hierarchical N-doped carbon network wrapped Fe₃Se₄ nanoparticles (Fe₃Se₄ @NC@CNTs) has been successfully fabricated by a facile freeze-drying method followed by in situ selenization process. The macroporous with a diameter of about 200 nm uniformly distributed into the hierarchical carbon network, guaranteeing favorable electronic conductivity as well as structural stability. When utilized as anodes for sodium ion batteries, the Fe₃Se₄ @NC@CNTs exhibit a capacity of 440 mAh g⁻¹ after 100 cycles at 100 mA g⁻¹ (based on the total mass of the composite). Even cycling at 500 mA g⁻¹ for 1000 cycles, the electrode still remains 311 mAh g⁻¹. In addition, the Fe₃Se₄ @NC@CNTs also shows excellent hydrogen evolution reaction performance (an overpotential of 167 mV at 10 mA cm⁻² and a Tafel slope of 68 mV dec⁻¹). The superior electrochemical performance of the Fe₃Se₄ @NC@CNTs could be ascribed to the unique hierarchical network and uniform porous structure, which accommodates the volume changes of inner Fe₃Se₄, accelerates the ions/electrons transportation and facilitates electrolyte penetration. These results may give insights for the rational design of advanced electrode materials.