Transition metal polysulfides/oxides typically perform high reversible capacities in sodium-ion batteries/capacitors (SIBs/SICs), but low conductivity and slow redox reaction kinetics are still the main challenges for achieveing fast kinetics. Here, we construct the VS₄/Nb₂O₅/GO composite structure, which can promote the overall conductivity and structural stability through the GO and VS₄ bonding (V-C and S-C) on the surface. Meanwhile, the chain-like VS₄ and Nb₂O₅ connected with the V-O chemical bond can accelerate the electron and ion transfer internally, thus enabling the internal structure exposed during the activation process. Additionally, the bonding of VS₄ and Nb₂O₅ is calculated by density functional theory (DFT), indicating that the strong metallic properties of the composite. When as the anode material of SIBs, the specific capacity of 268.8 mA h g⁻¹ can be maintained after 2000 cycles at a current density of 10 A g⁻¹. After that, SICs are assembled using activated carbon (AC) as the cathode, which exhibit 58.01 Wh kg⁻¹ at high power density of 3800 W kg⁻¹. This unique composite structure design can provide a reference for achieving fast electron and ion transport both internally and externally to the electrode material.

过渡金属多硫化物/氧化物通常在钠离子电池/电容器 (SIBs/SICs) 中具有高可逆容量，但低电导率和缓慢的氧化还原反应动力学仍然是实现快速动力学的主要挑战。在这里，我们构建了 VS ₄ /Nb ₂ O _{5 /GO 复合结构，它可以通过表面上的 GO 和 VS 4}键合（VC 和 SC）提高整体导电性和结构稳定性。同时，链状 VS ₄和 Nb ₂ O ₅与VO 化学键连接可以加速内部电子和离子转移，从而使内部结构在激活过程中暴露出来。此外，VS ₄和Nb ₂ O ₅的结合是通过密度泛函理论(DFT)计算的，表明复合材料具有很强的金属性能。作为SIBs的负极材料，在10 A g ^-1的电流密度下循环2000次后仍可保持268.8 mA hg ^-1的比容量。之后，使用活性炭 (AC) 作为阴极组装 SIC，在 3800 W kg -1 的高功率密度下表现出 58.01 ^Wh kg ^-1. 这种独特的复合结构设计可以为实现电子和离子在电极材料内部和外部的快速传输提供参考。