摘要
An urchin-like NiCoSe₂/NC composite of transition metal selenide and N-doped carbon is derived from NiCo MOFs. • The NiCoSe₂/NC combines bimetallic synergy, heteroatom doping, dual carbon confinement and 3D conductive networks. • The NiCoSe₂/NC delivers high sodium storage capacity, outstanding cycling stability and rapid reaction kinetics. • The SIHCs based on NiCoSe 2 /NC exhibits good comprehensive performance and high energy-power characteristics. As a high-performance energy storage device, sodium-ion hybrid capacitors (SIHCs) still face the challenge of finding anode materials with fast kinetic behavior and stability to match capacitive electrode materials with fast kinetics. Transition metal selenides are expected to be ideal anode materials for batteries due to their high theoretical sodium storage capacity and fast ion diffusion rate. However, large volume change and poor conductivity hinder their practical application. In this paper, NiCo-bimetallic selenide embedded in N-doped porous carbon matrix (NiCoSe 2 /NC), presenting a spherical architecture similar to that of a sea urchin, was prepared by controllable selenization of NiCo-bimetallic organic framework. The synergistic effect between nickel‑cobalt selenides increases the sodium storage active sites and improves the conductivity and structural stability. The good conductive network and ion transport channel formed by N-doped hierarchically porous carbon can effectively improve the kinetic behavior, alleviate the volume change and maintain the structural stability of the material during the energy storage process. Consequently, the as-built SIHC based on the NiCoSe 2 /NC anode and home-made porous carbon cathode has high energy-power characteristics (113.1 Wh kg −1 /14 kW kg −1 ) and excellent cycle stability (98.6% capacity retention after 10,000 cycles at 1 A g −1 ), showing great potential for application in the energy storage field. Download: Download high-res image (233KB) Download: Download full-size image
危险品化学品经营许可证（带存储）