A desirable material with high surface area and optimized electronic properties is urgently required to boost the supercapacitors performance. Herein, we develop a hierarchical heterogeneous electrode material of NiCo₂O₄@CoWO₄/NF with nano-needles combined core-shell structure. This hierarchical heterogeneous electrode material features optimized interface charge distribution, which improves the electron transfer rate and storage density. In addition, we propose a mechanism concerning that the heterogeneous interface improves the surface electron delocalization to enhances the hydroxyl adsorption energy. The hydroxyl adsorption energy is increased from 0.95 eV to 1.13 eV in the presence of NiCo₂O₄@CoWO₄ heterogeneous interface. As a result, the reaction kinetics between the electroactive center of NiCo₂O₄ and the collector is enhanced under the strong interfacial coupling of CoWO₄, a specific capacity as high as 1624 C g⁻¹ (with a current density of 1 A g⁻¹), and an energy density of 88.38 Wh kg⁻¹ (with a power density of 884.78 W kg⁻¹) with a wide voltage window of 0-1.7 V. In addition, it also shows surprising cycling stability with 98% capacity retention after 10,000 cycles at a current density of 10 A g⁻¹. This work provides a new strategy for optimizing the surface and interfacial electronic properties of heterostructure materials.

中文翻译：

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调控混合非对称超级电容器NiCo2O4@CoWO4负极材料中的局部电荷分布


迫切需要一种具有高表面积和优化电子性能的理想材料来提高超级电容器的性能。在此，我们开发了一种具有纳米针组合核壳结构的 NiCo₂O₄@CoWO₄/NF 的分层异质电极材料。这种多级异质电极材料具有优化的界面电荷分布，从而提高了电子传输速率和存储密度。此外，我们提出了一种机制，即异质界面改善了表面电子离域以增强羟基吸附能。在 NiCo₂O_{4@CoWO 非均}相界面存在下，羟基吸附能从 0.95 eV 增加到 1.13 eV。结果，在 CoWO₄ 的强界面耦合下，NiCo₂O₄ 的电活性中心与集流体之间的反应动力学得到增强，比容量高达 1624 C ^g-1（电流密度为 1 A ^g-1），能量密度为 88.38 Wh ^kg-1（功率密度为 884.78 W ^kg-1），具有 0-1.7 V 的宽电压窗口。此外，它还显示出令人惊讶的循环稳定性，在 10 A g⁻¹ 的电流密度下经过 10,000 次循环后，容量保持率为 98%。这项工作为优化异质结构材料的表面和界面电子性能提供了一种新策略。