Orthorhombic (T-) Nb₂O₅ is an intercalation pseudocapacitive material that possesses fast Li⁺ diffusion pathways in its bulk crystalline structure. Herein, hollow core-shell nanostructures made up of T-Nb₂O₅ nanoparticles confined within porous carbon shells are constructed for further boosting its high-rate Li-insertion/extraction capability. By using different silica template precursors, carbon shells with mesoporous channels or relatively dense structure could be created, both of the T-Nb₂O₅@carbon hollow core-shell nanostructures demonstrate significant improvement on the rate capability compared to the T-Nb₂O₅ nanoparticles. Furthermore, it is found that the carbon shells with accessible mesopores of ∼6 nm could provide a higher specific surface area and larger Li⁺ diffusion channels, and thus the T-Nb₂O₅@mesoporous carbon (Nb₂O₅@MC) hollow core-shell nanostructures show better high-rate properties with a capacity of 173 C g⁻¹ at a current density of 50 A g⁻¹. When paired up with mesoporous carbon hollow nanospheres (MCHS) cathode, the Nb₂O₅@MC//MCHS hybrid supercapacitor could deliver both ultrahigh power density and high energy density (∼16 kW kg⁻¹ with an energy density of 12 Wh kg⁻¹), which is attractive for a wide range of power delivery applications.

斜方晶系（T-）Nb ₂ O ₅是一种层间拟电容材料，在其整体晶体结构中具有快速的Li ⁺扩散途径。在此，构造由限制在多孔碳壳内的由T- Nb ₂ O ₅纳米颗粒组成的中空核-壳纳米结构，以进一步提高其高速率的锂插入/提取能力。通过使用不同的二氧化硅模板前体，可以生成具有中孔通道或相对致密结构的碳壳，这两种T- Nb ₂ O ₅与T -Nb ₂ O ₅纳米颗粒相比，碳空心核壳纳米结构显示出速率能力的显着改善。此外，发现具有约6nm可及的中孔的碳壳可以提供更高的比表面积和更大的Li ⁺扩散通道，因此T- Nb ₂ O ₅ @中孔碳（Nb ₂ O ₅ @MC）中空芯-壳纳米结构示出了具有容量的173 C g还更好的高速率特性^-1在50甲g的电流密度^-1。与中孔碳空心纳米球（MCHS）阴极配对时，Nb₂ O ₅ @ MC // MCHS混合超级电容器可同时提供超高功率密度和高能量密度（〜16 kW kg ^-1，能量密度为12 Wh kg ^-1），对于广泛的功率输送应用具有吸引力。